IQS211A-00000000-TSR

ProxSense® Series IQS211A Datasheet Single Channel Capacitive Proximity/Touch Controller with movement detection The IQS211A ProxSense® IC is a self-capacitance controller designed for applications where an awake/activate on proximity/touch function is required. The IQS211A is an ultra-low power solution that uses movement detection for applications that require long term detection. The IQS211A operates standalone or I2C and can be configured via OTP (One Time Programmable) bits. 6 pin TSOT23-6 RoHS2 Compliant Features             Pin compatible with IQS127D/ 128/ 227AS/ 228AS/ 231A Automatic Tuning Implementation (ATI) On-chip movement detection algorithm Forced activation when movement detected Minimal external components Down to 10aF capacitance resolution Up to 60pF sensor load (with effective movement detection) Up to 200pF sensor load for touch application Multiple One-Time-Programmable (OTP) options Standalone direct outputs: o Primary output (configurable) Default: ACTIVATION o Secondary output (configurable) Default: MOVEMENT 1-Wire streaming interface: o 1-Wire & event CLK signal o Valuable for debugging Various I2C configurations: o Normal polling o Polling with RDY interrupt on SCL Representations only, not actual markings o Runtime switch to standalone mode Separate MOVEMENT output selection: Pulse Frequency Modulation (PFM, default), Pulse Width Modulation (PWM), Latched, or PWM only active in activation Low power consumption: o 80uA (50 Hz response), o 20uA (20 Hz response) o sub-2uA (LP mode, optional zoom to scanning mode with wake-up) Low power options: o Low power without activation o Low power within activation o Low power standby modes with proximity wake-up / reset wake-up Internal Capacitor Implementation (ICI) Supply voltage: 1.8V to 3.3V Low profile TSOT23-6 package       Applications    Wearable devices Movement anti-theft) detection devices (fitness,    Human Interface Devices Proximity activated backlighting Applications with long-term activation White goods and appliances Available Packages Copyright © Azoteq 2018 All Rights Reserved TA TSOT23-6 -20°C to 85°C IQS211A IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 1 of 30 March 2018 ProxSense® Series 1 Functional block diagram VDDHI VDDHI VREG Internal regulator BOD POR circuit Digital - μP, RAM, ROM Nonvolatile memory VSS SDA / IO2 Analog ProxSense Engine (ADC) I2C HW or GPIO SCL / IO1 MCU (Master) Analog - Capacitive offset calibration Cx Reference GND (battery, metal frame, copper pad) Sensing Pad ∆E-field = ∆Capacitance Figure 1-1 IQS211A functional block diagram The IQS211A supports relative capacitance measurements for detecting capacitance changes. Basic features of the IQS211A include:  Charge-transfer capacitance measurement technology (Analog ProxSense® Engine)  Finite state machine to automate detection and environmental compensation without MCU interaction (integrated microprocessor)  Self-capacitance measurements  Signal conditioning to provide signal gain (Analog – Capacitive offset calibration)  Signal conditioning to provide offset compensation for parasitic capacitance (Analog – Capacitive offset calibration)  Integrated calibration capacitors (Analog – Capacitive offset calibration)  Integrated timer for timer triggered conversions  Integrated LDO regulator for increased immunity to power supply noise  Integrated oscillator  Processing logic to perform measurement filtering, environmental compensation, threshold detection and movement detection Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 2 of 30 March 2018 ProxSense® Series 2 Packaging and Pin-Out The IQS211A is available in a TSOT23-6 package. IO1 / SCL / 1WIRE 1 VSS 2 6 Cx IQS 211 211A IO2 / SDA 3 5 VDDHI 4 VREG Figure 2-1 IQS211A pin-out (TSOT23-6 package) Table 2.1 Pin-out description IQS211A in TSOT23-6 Pin Name Type Function 1 PRIMARY I/O Digital Input/Output 2 3 4 5 VSS SECONDARY I/O VREG VDDHI Signal GND Digital Input/Output Regulator output Supply Input Cx Sense electrode 6 Multifunction IO1 / SCL (I2C Clock signal) / 1WIRE (data streaming) Multifunction IO2 / SDA (I2C Data output) Requires external capacitor Supply:1.8V – 3.6V Connect to conductive area intended for sensor VDDHI VDDHI R2 DS0 40R U1 5 VDDHI 6 CX IO1/SCL/1WIRE IO2/SDA/EVENT 2 C3 C4 1uF 100pF GND VREG R4 R1 1 IO1/SCL/DATA 3 IO2/SDA/EVENT 4 VREG 470R IO2/SDA/EVENT CX DS1 C5 10pF R5 BLUE IO1/SCL/DATA 470R IQS211A GND GND GREEN 470R GND C1 C2 1uF 100pF GND GND VDDHI VDDHI R6 R7 4k7 4k7 IO1/SCL/DATA IO2/SDA/EVENT Figure 2-2 IQS211A reference schematic Figure 2-2 shows the following:  Schematic for default power mode, see guide for capacitor selection in low power modes below: Low power scan time 8ms (default) - 32ms 64ms 128ms 256ms Capacitor recommendation C1 = 1µF C3 = 1µF C1 = 1µF C3 = 2.2µF C1 = 2.2µF C3 = 4.7µF C1 = 4.7µF C3 = 10µF  C5 = 10pF load. This can be changed for slight variations in sensitivity. The recommended value is 1pF to 60pF, depending on the capacitance of the rest of the layout.  R1 = 470Ω 0603 for added ESD protection Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 3 of 30 March 2018 ProxSense® Series  * R2: Place a 40Ω resistor in the VDDHI supply line to prevent a potential ESD induced latch-up. Maximum supply current should be limited to 80mA on the IQS211A VDDHI pin to prevent latch-up. VDDHI VDDHI R2 DS1 40R U1 5 VDDHI CX IO1/SCL/1WIRE IO2/SDA/EVENT 2 C3 C4 1uF 100pF GND VREG 6 1 IO1/SCL/DATA 3 IO2/SDA/EVENT 4 VREG R1 R5 470R 470R CX IO1/SCL/DATA C5 10pF IQS211A IO2 GND C1 C2 1uF 100pF VDDHI R4 R5 680R 10k GND GND GND GND IO1/SCL/DATA R4 required when “VREG damping on IO2” is selected for lowest power consumption GND Figure 2-3 IQS211A reference schematic for ultra-low power (ULP) modes with VREG damping through IO2 selected (OTP bank3:bit3) Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 4 of 30 March 2018 ProxSense® Series 3 Configuration Options The IQS211A offers various user selectable options. These options may be selected via I 2C setup or one-time programmable (OTP) configuration. OTP settings may be ordered preprogrammed for bulk orders. I2C setup allows access to all device settings while entering direct output mode as soon as selected by the MCU. Azoteq offers a Configuration Tool (CT210 or later) and associated software that can be used to program the OTP user options for prototyping purposes. For further information regarding this subject, please contact your local distributor or submit enquiries to Azoteq at: info@azoteq.com Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 5 of 30 March 2018 ProxSense® Series 3.1 User Selectable OTP options OTP bank 0 IQS211A 000000xx TSR (ordering code) Bit7 6 Base Value / Coarse multiplier 5 Scan times 00 – 150 counts / 0 01 – 75 / 1 10 – 100 / 2 11 – 200 / 3 Idle / Active 00 - 9/9ms 01 - 9/64 10 - 32/32 11 - 32/64 See Proxsense® sensitivity 4 3 Prox wake-up 2 1 Bit 0 Low-power scan time 000 - 9ms 001 - 32ms 010 - 64ms 011 - 96ms 100- 128ms 101 - 160ms 110 - 192ms 111 - 256ms 0 – Active direction 1 – Both directions See Figure 4-11 OTP Bank 1 IQS211A 0000xx00 TSR Bit7 Touch late release (50%) 6 5 Filter halt / Wake-up threshold 4 3 Touch threshold 0 – Disabled 00 – 4 counts (+2 LP) 01 – 2 (+2 LP) 10 – 8 (+2 LP) 11 – 16 (+2 LP) 1 – Enabled 2 000 – 6/256 of LTA 001 – 2/256 010 – 16/256 011 – 32/256 100 – 48/256 101 – 64/256 110 – 80/256 111 – 96/256 IQS211A 00xx0000 TSR Bit7 6 5 Reseed after no movement time 4 3 Movement output type 000 - 2s 001 - 5s 010 - 20s 011 - 1min 100 - 2min 101 - 10min 110 - 60min 111 - always halt 00 -Normal (PFM) 01 - PWM 10 - Constant Movement , clears upon no movement timeout 11 - PFM combined with activation output Bit7 Reserved 6 6 Reserved 2 1 Output / User interface selection Bit 0 000 -Activation(IO1) & Movement(IO2) 001 -Movement Latch(IO1) and Movement (IO2) 010 - Movement(IO1) & Input(IO2) 011 - Touch (IO1), Prox (IO2) 100 - 1Wire (IO1) & Clk (IO2) (only on events) 101 - I2C (polling*) no wakeup 110 - I2C with reset indication+RDY toggle on SCL 111 - I2C (polling*) +Wakeup +RDY toggle on SCL I2C address fixed on 0x47 Runtime change from I2C to standalone is possible IQS211A 0x000000 TSR 5 OTP Bank 4 Bit7 1 Bit 0 Movement threshold 00 – 3 counts 01 – 6 10 – 15 11 – 2 OTP Bank 2 OTP Bank 3 sub-2µA 4 3 VREG damping through IO2 2 AC Filter 1 Halt charge / Reseed on IO1 Bit 0 IO1 (output) / IO2 (input) definition 0 – Disabled 1 – Enabled (sub-2µA) 0 – Normal 1 – Increased 0 – Disabled 1 – Enabled 0 – Normal / Halt charge 1 – PWM / Reduce sensitivity Bit 0 IQS211A x0000000 TSR 5 4 3 2 1 ATI partial Auto activation (when compensation multiplier > 7) ATI target 0 – Disabled 1 – Enabled 0 – Disabled 1 – Enabled 00 – 768 counts 01 – 1200 10 – 384 sub-2µA 11 – 192 * For sub-2µA power consumption see: “Low-power scan time”, “VREG damping” and “ATI target” settings (example configuration) Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 6 of 30 March 2018 ProxSense® Series 3.2 I2C registers 2 Table 1.1 I C communications layout I2C Communications Layout Address/ Command/ Byte Register name/s R/W Default Value 00H 01H 10H PRODUCT_NUM VERSION_NUM SYSFLAGS0 R R R/W 0x3D 0x01 41H 42H Movement Value CS_H R R 43H 83H CS_L LTA_H R R 84H 90H 91H C4H LTA_L Touch Threshold_H Touch Threshold_L MULTIPLIERS R C5H C6H COMPENSATION PROX_SETTINGS0 R/W R/W C7H PROX_SETTINGS1 R/W R/W Bit 7 Bit 6 Bit 5 Bit 4 Movement Movement Constant PROX n/a n/a Coarse multiplier Base Value/ Coarse multiplier for Partial ATI: 00 – 150/0 01 – 75/1 10 – 100/2 11 – 200/3 Do reseed 0 – Auto reseed is in seconds 1 – Auto reseed is in minutes Halt Charge/Reseed on IO1, with IO1 set as output If UI type 011: 0- Halt charge/Reseed 1- Reduce sensitivity If UI type 000: 0- Normal 1- PWM touch out TOUCH Bit 3 Show Reset Bit 2 ATI Busy Bit 1 Filter Halt Bit 0 LP Active Fine multiplier 0-255 Redo ATI 0 – Active direction 1 – Both directions 00 –Normal (PFM) 01 – PWM 10 – Constant Movement , clears upon no movement timeout 11 – PFM combined with activation output 000 - 9ms 001 - 32ms 010 - 64ms 011 - 96ms 100- 128ms 101 - 160ms 110 - 192ms 111 - 256ms 000 –Activation(IO1) & Movement(IO2) 001 –Movement Latch(IO1) and Movement (IO2) 010 – Movement(IO1) & Input(IO2) 011 – Touch (IO1), Prox (IO2) 100 – 1Wire (IO1) & Clk (IO2) (only on events) 101 – I2C (polling) no wakeup 110 - I2C with reset indication +RDY toggle on SCL 111 – I2C (polling) + Wakeup + RDY toggle on SCL It is possible to change to non-I2C modes when in I2C mode. I2C functionality will only return after a power cycle C8H PROX_SETTINGS2 R/W C9H CAH CBH CCH CDH CEH ATI_TARGET LP_PERIOD PROX_THRESHOLD TOUCH_THRESHOLD MOVEMENT_THRESHOLD AUTO_RESEED_LIMIT R/W R/W R/W R/W R/W R/W Copyright © Azoteq 2018 All Rights Reserved 0 – Prox Timeout of 2s 1 – Prox timeout of 20s n/a AUTO Activation on start up n/a Touch Late Release (50%) Partial ATI enabled Auto ATI off Increase AC filters, increase touch threshold with 10counts, halt with 4 x * 8 = ATI target x * 16ms = sleep time in Seconds or Minutes, based on PROX_SETTINGS1 bit 7. IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 7 of 30 March 2018 ProxSense® Series mode also has access to all these settings. 4 Overview The movement output may be chosen to have a specific characteristic. This may be PFM (movement intensity via pulse count per time window), PWM, latched output or PWM combined with the normal threshold activation. 4.1 Device characteristics The IQS211A is a device tailored for long term proximity or touch activations. It mainly offers two digital output pins, one with an activation threshold for large capacitive shifts and the other with a 4.1.1 Normal threshold operation yes Reset Timer Default 3 min MOV_OUT pin PULSE Cross Threshold? Capacitance DEC yes Activation False IO1 pin1 DEACTIVATED Cross Threshold? Capacitance INC OR Movement Detected? no Activation True IO1 pin ACTIVATED yes Movement Detected? no no no Power On / Reset Auto-calibrate Timer depleted Timer Countdown yes Figure 4-1 Flow diagram of the typical IQS211A movement based user interface threshold for small movements even during a normal activation. There are also a few options to combine these two digital outputs where the application only allows for 1 output pin. These two outputs may be read via the IC pins in standalone mode or used for communications via I2C or 1-Wire streaming mode. With a normal activation (hand brought close) the output will become active. The output will de-activate as soon as the action is reversed (hand taken away). In addition a separate movement output will become active when movement is detected according to a movement threshold. Movement may be detected before the INC  Capacitance (Counts)  DEC Various configurations are available via one-time programmable (OTP) options. I2C LTA (LONG TERM AVERAGE) Threshold Cross threshold before time-out Time IO2 (Movement) IO1 (Activation) Timer Reset (Internal) Figure 4-2 Plot of IQS211A streaming data along with the digital response Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 8 of 30 March 2018 INC  Capacitance (Counts)  DEC ProxSense® Series Performs recalibration routine LTA (LONG TERM AVERAGE) Threshold No movement time-out (default 2 sec) IO2 (Movement) IO1 (Activation) Timer Reset (Internal) Figure 4-3 Example of a time-out event with re-calibration normal threshold is crossed. Movement detection is done via a completely separate digital filter while improving the efficiency of the sensor output (timer reset on movement). In a normal activation the output will stay active for as long as movements are detected. A time-out timer (configurable time) will be reset with each movement. 4.1.2 Output forced by movement There is the option to force the output active for each movement detected. The output will be cleared as soon as there is no movement for the selected timer period. Copyright © Azoteq 2018 All Rights Reserved 4.1.3 Long term recovery When changing the sensor capacitive environment, the sensor will adapt to the new environment. If the new environment decreases capacitance (wooden table to air), the sensor will rapidly adapt in order to accept new human activations. If the new environment increases capacitance (like air to steel table), the sensor will remain in activation until a time-out occurs (as seen in Figure 4-3) or until the device is returned to its previous environment. When the timer runs out, the output will be de-activated. Re-calibration is possible after de-activation because the timer will only time-out with no movement around the sensor. IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 9 of 30 March 2018 ProxSense® Series MOVEMENT LATCH & MOVEMENT UI 4.1.4 Choosing a user interface The user interface can be defined via OTP options or via an I2C register ACTIVATION & MOVEMENT UI NO ACTIVATION NO ACTIVATION Proximity detect No movement for x-seconds (recalibrate) No movement for x-seconds (recalibrate) No proximity detect Figure 4-6 MOVEMENT LATCH UI state Movement detect diagram ACTIVATION ACTIVATION Figure 4-4 ACTIVATION & MOVEMENT UI state diagram Figure 4-7 Remote control example of movement latch UI application Figure 4-5 Toy car example of default UI 1. Lights off 2. Touch roof, lights on 3. No touch on roof, lights off 4. While in use (movement), lights on 5. Roof on ground = touch 6. No movement causes time-out, lights off Copyright © Azoteq 2018 All Rights Reserved 1. Remote backlight/LCD off 2. Hand close to remote = LCD on 3. Hand away, then LCD remains on 4. LCD off after no movement time-out 5. If remote in hand, but LCD off, then any small movement turns on LCD. 6. While in hand and movement, LCD remains on. IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 10 of 30 March 2018 ProxSense® Series MOVEMENT & INPUT UI Sensitivity Increase Sensitivity Normal 4.1.5 Integrated features Detection field Sensitivity Normal Input = Reduce The device includes an internal voltage regulator and reference capacitor (Cs). Various advanced signal processing techniques are combined for creating a robust solution. These techniques include:  Movement detection filter (to release an Capacitive sensing pad Figure 4-8 Device charging example of input UI Device is operating on battery with designed sensitivity Device is plugged-in for charging Device ground reference changes and sensitivity increases Input is given to reduce sensitivity activation in the case of inactivity)  Advanced noise filtering on incoming sample stream  Superior methods of parasitic capacitance compensation while preserving sensitivity  Unique option for capacitive load dependant activation on power-on PROX & TOUCH UI 4.1.6 Communications protocols The IQS211A offers a wide range of data streaming modes each with a specific purpose. Standard 2-wire I2C polling is offered to access the entire range of settings and data offered by the IQS211A. Figure 4-9 Proximity and touch state diagram Touch area Capacitive sensing pad Proximity area Figure 4-10 Proximity and touch UI example Proximity to the device activates proximity output Touching the device activates the touch output (proximity remains triggered) Movement features are integrated and function the same as in the default “ACTIVATION & MOVEMENT” user interface Another I2C option allows the device to be configured via I2C then jump to any of the other modes when the communication window is closed. This option is offered to give full control over selecting settings while simplifying the main-loop code by only responding to direct digital outputs. The digital output pair will contain signature pulses to indicate power-on reset or an unexpected reset occurrence. I2C configuration should be re-initiated in the event of an IQS211A reset. A 1-wire data streaming interface is offered for access to a variety of data over a single line. The 1-wire implementation may be enhanced (by using the IO2 pin) by only reading data when the IO2 clock pin toggles. The clock pin will only toggle when an event is active and produce a clock signal during this active period. 1-wire data streaming is a special use case for debugging with optical isolation and Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 11 of 30 March 2018 ProxSense® Series Azoteq PC software. For other requirements, please contact Azoteq at info@azoteq.com 4.1.7 Automatic Calibration Proven Automatic Tuning Implementation (ATI) algorithms are used to calibrate the device to the sense electrode. This algorithm is optimised for applications where a fixed detection distance is required. 4.1.8 Capacitive sensing method The charge transfer method of capacitive sensing is employed on the IQS211A. Charge is continuously transferred from the Cx capacitor into a charge collection capacitor (internal) until this capacitor reaches a trip voltage. A “transfer cycle” refers to the charging of Cx and transferring the charge to the collection capacitor. The “charge cycle” refers to process of charging the collection capacitor to a trip voltage using charge transfers. A charge cycle is used to take a measurement of the capacitance of a sense “pad” or “electrode” relative to signal earth at a specific time. 4.2 Operation 4.2.1 Device Setup The device may be purchased preconfigured (large orders or popular configurations), programmed in-circuit during production or simply setup via I2C. 4.2.2 Movement filter response The movement filter runs continually and the dedicated digital output will activate in PFM (pulse frequency modulation), PWM or latched mode. 4.2.3 External control With certain user interfaces, the “multifunction IO2” (optional line to connect to master device) can be used to signal:  a “halt (sleep mode) and reseed” or “reduce sensitivity” in MOV&INPUT mode. Copyright © Azoteq 2018 All Rights Reserved  a “halt (sleep mode) and reseed” in ACT&MOV mode. When enabled, the ACT output reads the input periodically. RESEED A short pulse (t > 15ms, t < 25ms) will force the reference counts (long-term average) to match the actual counts (capacitance of sensor). The short pulse for a reseed operation also applies to the user configurable input option: “Reduce sensitivity”. HALT CHARGE (& RESET) By writing the pin low for a longer time (t > 50ms), will force the IC into “halt charge” for low current consumption. It is important to consider current through the pull-up resistor when in sleep mode. The IC will perform a soft reset as soon as the pin is released after 50ms or more. With a soft reset the IC will remember the activation state when going into the “halt charge” mode. The state will be recalled at the reset operation and cleared along with the calibration. In order to achieve a “halt charge” state with minimal power consumption it is recommended to configure the MCU output as push-pull for the input pin and perform the “halt charge”. With the “movement latch” function defined, do the operation twice to clear a possible activation at the time of calling a “halt charge”. REDUCE SENSITIVITY With a configurable bit the system sensitivity may be changed. The input may be used to reduce sensitivity in the following way:  AC filter doubles in strength  Proximity threshold (filter halt) is increased by 4 counts  Activation threshold is increased by 10 counts  Movement sensitivity threshold is not changed IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 12 of 30 March 2018 ProxSense® Series 4.2.4 Low power options Various low-power configurations are offered in order to achieve the required current consumption during activated and non-activated conditions. These low power configurations make the power consumption and product response highly configurable during various events. Sleep time: 9 / 32 / 64 / 96 / 128 / 160/ 190 / 256ms 9ms 9ms SLEEP 32ms 32ms 64ms 32ms 9ms 64ms in ACTIVATION IDLE in filter halt (proximity event) no filter halt Figure 4-11 Low power mode description from outside (no interaction), to inside (full interaction) Scan time Sample time Response (standalone) / Communication (I2C or 1-wire) Sleep time Figure 4-12 Sample-, scan-, sleep- and communication time diagram 4.3 ProxSense® sensitivity The measurement circuitry uses a temperature stable internal sample capacitor (C S) and internal regulated voltage (VREG). Internal regulation provides for more accurate measurements over temperature variation. The Automatic Tuning Implementation (ATI) is a sophisticated technology implemented on the ProxSense® series devices. It allows for optimal performance of the devices for a wide range of sense electrode capacitances, without modification or addition of external components. The ATI functionality ensures that sensor sensitivity is not affected by external influences such as temperate, parasitic capacitance and ground reference changes. The ATI process adjusts three values (Coarse multiplier, Fine multiplier, Compensation) using two parameters (ATI base and ATI target) as inputs. An 8-bit compensation value ensures that an accurate target is reached. The base value influences the overall sensitivity of the channel and establishes a base count from where the ATI algorithm starts executing. A rough estimation of sensitivity can be calculated as: Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 13 of 30 March 2018 ProxSense® Series 𝑇𝑎𝑟𝑔𝑒𝑡 𝐵𝑎𝑠𝑒 As seen from this equation, the sensitivity can be increased by either increasing the Target value or decreasing the Base value. A lower base value will typically result in lower multipliers and more compensation would be required. It should, however, be noted that a higher sensitivity will yield a higher noise susceptibility. 𝑆𝑒𝑛𝑠𝑖𝑡𝑖𝑣𝑖𝑡𝑦 ∝ 4.4 Applicability All specifications, except where specifically mentioned otherwise, provided by this datasheet are applicable to the following ranges: Temperature:-20C to +85C Supply voltage (VDDHI): 1.8V to 3.6V Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 14 of 30 March 2018 ProxSense® Series 5 Details on user configurable options 5.1.1 Bank 0: Sensitivity and scan time adjustments Bank0: bit 7:6 Base Value (Sensitivity Multiplier in Partial ATI mode) See Proxsense® sensitivity. Changing the base value enables the designer to adjust sensitivity. Lower base values will increase sensitivity and are recommended for systems with a high SNR ratio. Higher base values will prevent noise from being amplified, but will result in less sensitivity. With Bank4: bit 2 set (partial ATI), the area of operation may be fixed to a certain extent. This is ideal for stationary applications where a specific type of trigger is expected. With Bank4: bit 0 set (auto-activation P>7), partial ATI must be enabled to ensure the desired results. With the “Sensitivity Multiplier” fixed, the P value will indicate whether a certain threshold has been crossed at power-up. Bank0: bit 5:4 IDLE (proximity) / ACTIVE (touch) scan time Select an IDLE / ACTIVE combination scan time to achieve the desired response with target power consumption in mind. Bank0: bit 3 Prox wake-up direction Active direction – only go to IDLE (proximity) scan time when an actual proximity event occurs. Both directions – go to IDLE (proximity) scan time when a proximity event occurs or when a significant environment change occurs. This mode will enable quick touch response in a dynamic environment (for example devices used on the human wrist) Bank0: bit 2:0 SLEEP (no proximity) low power scan time Select a SLEEP scan time to determine the most significant power consumption figure of the device. 5.1.2 Bank 1: Threshold adjustments Bank1: bit 7 Touch late release (50% of touch threshold) This option will enable a user interface where activation would occur as usual, but the deactivation will occur at a relaxed threshold. It will therefore counter unwanted false releases. This option is ideal for handheld devices that will active with a typical “grab” action, but will not release when the grip on the device is relaxed. Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 15 of 30 March 2018 ProxSense® Series Touch detect Proximity release (Threshold 2) NO ACTIVATION No movement for x-seconds (recalibrate) ACTIVATION RELAXED THRESHOLD ACTIVATION DEEP THRESHOLD Touch release Figure 5-1 State diagram of touch late release interface Figure 5-2 Touch late release example Bank1: bit 6:5 Proximity threshold (delta counts from LTA) The proximity threshold may be chosen to halt the filters that allow for temperature drift and other environmental effects. Choose a low value in order to increase the trigger distance for slow proximity activations. Choose a high value if the device and/or sensing electrode overlay is in a highly variable temperature environment. A high value is also recommended for touch button implementations with the IQS211A. This threshold will not trigger any of the output signals in most of the user interface options. The result of this threshold becomes an output in the “Proximity and touch” user interface option, where movement is only operating in the background. Bank1: bit 4:2 Touch threshold (delta percentage from LTA) The touch threshold is the highly variable threshold that will determine the triggering of the activation output. This threshold may be chosen for various proximity trigger distances (low values 1 to 15) including a few settings that allow for the implementation of a touch button (high values 15 to 90) Bank1: bit 1:0 Movement threshold (delta counts from movement average) The movement threshold is chosen according to the dynamic response longed for, but also according to the signal-to-noise ratio of the system. Battery powered applications generally deliver much higher SNR values, allowing for lower movement thresholds. Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 16 of 30 March 2018 ProxSense® Series 5.1.3 Bank 2: Timer, output type and user interface adjustment Bank2: bit 7:5 Reseed after no movement timer Depending on the user interface chosen, the activation output will clear when no movement is detected for the period selected here. This feature enables long-term detection in interactive applications while eliminating the risk of a device becoming stuck when placed on an inanimate object. Bank2: bit 4:3 Movement output type The movement output is a secondary output (normally IO2 pin) that may be used as the main output or supporting output. This output may be altered to suit the requirements of various applications. When user interface of “IO1: Movement; IO2: Input” is selected this output will be at the IO1 pin. ‘00’ – The default pulse frequency modulated (PFM) signal indicates intensity of movement by the density of pulses. This is a relatively slow output that may trigger occasional interrupts on the master side. See Figure 5-3. Most intense detectable movements are indicated by active low pulses with 10ms width (20ms period). Saturated movement intensity is indicated by a constant low. ‘01’ – The pulse width modulation (PWM) option is ideal for driving analogue loads. This signal runs at 1 kHz and the duty cycle is adapted according to the movement intensity. ‘10’ – The movement latched option triggers the output as soon as any movement is detected. The output only clears when no movement is sensed for the time defined in Bank2: bit 7:5. ‘11’ – The same PFM-type output as in the ‘00’ setting, but here the output will only become active once the activation threshold is reached. ‘00’ – PFM (pulse frequency modulation) IO2 PFM IO1 Figure 5-3 Movement (PFM) and activation output ’01’ – PWM Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 17 of 30 March 2018 ProxSense® Series IO2 (PFM UI) PFM IO1 (PFM UI) vs IO2 (PWM UI) PWM IO1 (PWM UI) Figure 5-4 PFM movement output (TOP: 15ms period minimum) compared with PWM movement output (BOTTOM: 1ms period) ‘10’ – Latched (forces output for duration of timer) IO2 (PFM UI) IO1 (PFM UI) IO2 (LATCHED UI) PFM vs IO2 latches until time-out after last movement Latched IO1 (LATCHED UI) Figure 5-5 PFM movement output (TOP) compared with latched movement output (BOTTOM). Movement output is forced by first movement ‘11’ – PWM (only active during activation) Bank2: bit 2:0 User interface selection Follow the links in the OTP summary for information on the various options. Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 18 of 30 March 2018 ProxSense® Series 5.1.4 Bank 3: VREG damping, sample filter, input control and output PWM Bank3: bit 3 VREG damping on IO2 With this option enabled, be sure to follow the schematic in Figure 2-3. Current consumption is optimized through minimising processor awake time. With the damping option enabled, the VREG stabilisation time is significantly decreased, effectively optimizing processor wake time. In low µA power modes, this has a significant effect. Bank3: bit 2 AC filter increase With the AC filter increase enabled, the reaction time slows with more rapid changes being filtered out. This option is ideal for a system connected to a power supply with increased noise Bank3: bit 1 Activation output with input reseed & reset (halt charge) feature Extended IO1 definition: “000” Activation & Movement UI / “001” Movement latch output (forced) & Movement UI With digital outputs enabled the IO1 pin has the option of being an input to “halt charge” / “reseed”. A short pulse (t > 15ms, t < 25ms) will initiate a reseed action (LTA = counts – 8) and a longer pulse (t > 50ms) will enable a lower power mode without sensing. The IQS211A will reset after the longer pulse is released (after a “halt charge” the IC will reset). Bank3: bit 0 Multifunction Bit (applies only to certain UIs) Output definition: “000” Activation & Movement UI: The IO1 pin normally only triggering with crossing of the threshold can be configured to output the depth of activation in PWM data. This is ideal for interpreting the specific activation level with a master, or for simply indicating the activation level on an analogue load. Please note that when enabling this option, the PWM option on the IO2 pin will be disabled (Bank2: bit 4:3 option ‘01’ will be the same as ‘00’) Input definition: “010” Movement & Input UI: By selecting the UI with the IO2 pin defined as an input, this configuration bit will enable the choice of input between the following ‘0’ – The halt charge & reseed option as defined above or ‘1’ – Reduce movement sensitivity for applications that may switch between battery usage and more noisy power supplies for charging and back-up power. Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 19 of 30 March 2018 ProxSense® Series 5.1.5 Bank 4: Partial ATI, ATI target and power-on detection Bank4: bit 3 Partial ATI Partial ATI may be selected to limit the automatic tuning range of the sensor. This may give more predictable results, especially when the sensor tends to calibrate close to the edges by automatically choosing a certain sensitivity multiplier value. Set this bit and select a specific sensitivity multiplier value in Base Value (Sensitivity Multiplier in Partial ATI mode). A lower sensitivity multiplier value is recommended for light capacitive loads, while higher values for large capacitive loads. Set this bit if the auto-activation at power-up bit is set (Bank4: bit 0). By setting this bit, the auto activation “threshold” is chosen by selecting a sensitivity multiplier value Base Value (Sensitivity Multiplier in Partial ATI mode). A lower sensitivity multiplier value will result in a sensitive threshold, while higher values will give a less sensitive threshold. Bank4: bit 2 Auto Activation at power-up when P>7 (absolute capacitance detection method, partial ATI must be enabled, select sensitivity with the “Sensitivity Multiplier”) With (Bank4: bit 3) set this option allows for absolute capacitance detection at power-up. Use this in devices that require a threshold decision at power-up without the calibration step. Select a “threshold” by adjusting the sensitivity multiplier value in Base Value (Sensitivity Multiplier in Partial ATI mode). A lower sensitivity multiplier value will result in a sensitive “threshold”, while higher values will give a less sensitive “threshold”. Bank4: bit 1:0 ATI target The default target of 768 ensures good performance in various environments. Set this bit when increased activation distance and movement sensitivity is required. The target of 1200 is recommended for battery powered devices where high SNR ratios are expected. Targets of 384 and 192 are for touch applications where power consumption and processor wake time are to be optimized. Movement features are most pronounced and effective when using a high target. Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 20 of 30 March 2018 ProxSense® Series 6 I2C operation The IQS211A may be configured as an I2C device through the user interface selection in Bank2: bits 2:0: Bank2: bits 2:0 Description 101 Normal polling for use on I2C bus 110 I2C polling with signature pulses at power-up / reset. The clock also has a RDY pulse incorporated before each possible communications window. 111 The clock also has a RDY pulse incorporated before each possible communications window. The IC will wake-up on I2C bus pin changes. 6.1 Normal I2C polling (101) The IQS211A prioritizes doing capacitive conversions. With standard polling the IQS211A will do a conversion and thereafter open the window of maximum 20ms for I2C communications. If the microprocessor sends the correct address in this window, the IQS211A will respond with an ACK. When communications are successful, the window will close and conversions will continue. Figure 6-1 Typical polling example of IQS211A. The sequence addresses register 0x00 (top) and reads data (0x3D) from register 0x00 (bottom) 6.2 I2C polling with reset indication & RDY (110) This mode is based on I2C, but not I2C compatible. This mode is aimed at solutions that need the flexibility of the register settings but require standalone operation during run-time. The data and clock lines toggle at power-on or reset to indicate that the device requires setup. After changing the settings and more particularly the user interface option, the device will start operating in the required mode. Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 21 of 30 March 2018 ProxSense® Series In this mode the IQS211A is not recommended to share a bus with other devices. Normal polling may be used, but the master may also monitor the I 2C clock line as an indication from the IQS211A that the communications window is open. The clock line therefore serves as a ready line. Scan time Sample time Increased Scan time Communication timeout 20ms Processing VDDHI CLK 0V Delay before communication window 40us No communication initiated time (not to scale) Successful communications (initiated by master) Figure 6-2 How to use RDY signal on clock line Communications may be initiated at any time from clock low-to-high transition plus 40us until 20ms thereafter, when the communications window closes. Polling should be done within this time window in order to communicate with the device. If now communications are done the window will time out. If communications are completed with a stop command, the window will close and sampling will continue after a sleep period. After changing register 0xC7 bits 2:0 (memory map – user interface selection) in this mode, it is required to read any other register in order to activate the chosen user interface (such as a standalone mode) before sending a stop command. 6.3 I2C polling with RDY on clock and wake-up on pin change (111) This I2C mode is aimed at applications that require the flexibility of I2C settings, but requires wake-up functionality from the master side. A ready indication is also given on the clock line to enable the master to efficiently handle the available communications window. The wake-up on pin change prevents this configuration from being efficiently used along with other devices on the bus. Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 22 of 30 March 2018 ProxSense® Series 7 Specifications 7.1 Absolute maximum ratings The following absolute maximum parameters are specified for the device: Exceeding these maximum specifications may cause damage to the device.  Operating temperature -20°C to 85°C  Supply Voltage (VDDHI – VSS) 3.6V  Maximum pin voltage  Maximum continuous current (for specific Pins) VDDHI + 0.5V (may not exceed VDDHI max) 10mA  Minimum pin voltage VSS – 0.5V  Minimum power-on slope 100V/s  ESD protection ±8kV (Human body model)  Package Moisture Sensitivity Level (MSL) 1 Table 7.1 IQS211A General Operating Conditions DESCRIPTION Conditions Supply voltage Internal regulator output Default Operating Current Low Power Setting 1* PARAME TER VDDHI VREG 1.8 ≤ VDDHI≤ 3.6 3.3V, Scan time IIQS211DP =9 MIN TYP 1.8 1.62 MAX UNIT 3.3V 1.7 3.6 1.79 V V 77 88 μA 2** μA MAX UNIT Example 3.3V, Scan time IIQS211LP160 =160 *Scan time in ms **Defined for low target counts (192) Table 7.2 Start-up and shut-down slope Characteristics DESCRIPTION Power On Reset Brown Out Detect Conditions VDDHI Slope ≥ 100V/s @25°C VDDHI Slope ≥ 100V/s @25°C PARAMETER MIN POR 1.2 - V BOD - 1.5 V Table 7.3 Input signal response characteristics (IO1/IO2) DESCRIPTION Reseed function Halt charge / Reduce sensitivity function MIN 15 50 TYP 20 n/a MAX 25 n/a UNIT ms ms Table 7.4 Communications timing characteristics DESCRIPTION tcomms_timeout Copyright © Azoteq 2018 All Rights Reserved MIN - TYP 20 MAX - IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary UNIT ms Page 23 of 30 March 2018 ProxSense® Series Table 7.5 Digital input trigger levels DESCRIPTION Conditions All digital inputs VDD = 3.3V All digital inputs VDD = 1.8V All digital inputs VDD = 1.8V All digital inputs VDD = 3.3V Copyright © Azoteq 2018 All Rights Reserved PARAMETER Input low level voltage Input low level voltage Input high level voltage Input high level voltage MIN TYPICAL MAX 1.19 1.3 1.3 V 0.54 0.6 0.76 V 0.9 1.0 1.2 V 1.90 2.1 2.20 V IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary UNIT Page 24 of 30 March 2018 ProxSense® Series 8 Package information 8.1 TSOT23-6 C A B D E F J G I H Figure 8-1 TSOT23-6 Packaging i Table 8.1 TSOT23-6 Dimensions Dimension A B C D E F G H I J i Min (mm) Max (mm) 2.60 3.00 1.50 1.70 2.80 3.00 0.30 0.50 0.95 Basic 0.84 1.00 0.00 0.10 0.30 0.50 0° 8° 0.03 0.20 Drawing not on Scale Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 25 of 30 March 2018 ProxSense® Series 8.2 MSL Level Moisture Sensitivity Level (MSL) relates to the packaging and handling precautions for some semiconductors. The MSL is an electronic standard for the time period in which a moisture sensitive device can be exposed to ambient room conditions (approximately 30°C/85%RH see J-STD033C for more info) before reflow occur. Package TSOT23-6 Copyright © Azoteq 2018 All Rights Reserved Level (duration) MSL 1 (Unlimited at ≤30 °C/85% RH) Reflow profile peak temperature < 260 °C for < 30 seconds IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 26 of 30 March 2018 ProxSense® Series 9 Ordering and Part-number Information 9.1 Ordering Information Please check stock availability with your local distributor. IQS211A zzz zzz zz ppb BULK PACKAGING IC NAME CONFIGURATION PACKAGE TYPE IC NAME IQS211A = Self Capacitive Touch IC CONFIGURATION zzz zzz zz = IC configuration (hexadecimal) Default: 000 000 00 (other configurations available on request) sub-2uA: 382 028 95 PACKAGE TYPE TS = TSOT23-6 package BULK PACKAGING R = Reel (3000pcs/reel) – MOQ = 3000pcs MOQ = 1 reel (orders shipped as full reels) 9.2 Label Information REVISION x = IC Revision Number TEMPERATURE RANGE t = -20°C to 85°C (Industrial) DATE CODE P = Internal use WWYY = Copyright © Azoteq 2018 All Rights Reserved Batch number IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 27 of 30 March 2018 ProxSense® Series 9.3 Device Marking – Top There are 2 marking versions for IQS211A: 221A ENG Engineering Version IC NAME Figure 9-1 IQS211A engineer version, marked as 221A. 211Axx Batch Code IC NAME Figure 9-2 Production version marking of IQS211A. IC NAME 221A ENG 211A = = IQS211A Engineering version IQS211A Production version Batch Code xx = AA to ZZ 9.4 Device Marking - Bottom Some batches IQS211A will not have any bottom markings. These devices are configured after marking, and may have variations in configuration – please refer to the reel label. Other batches will display the version and unique product code on the chip on the bottom marking. TSOT23-6 Tape Specification Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 28 of 30 March 2018 ProxSense® Series Revision History Revision Number Description Date of issue V0.9 IQS211A preliminary datasheet 23 November 2015 V1.0 First release December 2015 V1.01 Updated Ordering information and Marking December 2015 V1.10 Latch-up prevention details added September 2016 V1.2 Temperature range updated 28 September 2017 V1.3 Datasheet extended with relevant information 28 February 2018 Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 29 of 30 March 2018 ProxSense® Series Contact Information USA Asia South Africa Physical 6507 Jester Blvd Address Bldg 5, suite 510G Austin TX 78750 USA Rm2125, Glittery City Shennan Rd Futian District Shenzhen, 518033 China 109 Main Street Paarl 7646 South Africa Postal Address 6507 Jester Blvd Bldg 5, suite 510G Austin TX 78750 USA Rm2125, Glittery City Shennan Rd Futian District Shenzhen, 518033 China PO Box 3534 Paarl 7620 South Africa Tel +1 512 538 1995 +86 755 8303 5294 ext 808 +27 21 863 0033 Fax +1 512 672 8442 Email info@azoteq.com +27 21 863 1512 info@azoteq.com info@azoteq.com Please visit www.azoteq.com for a list of distributors and worldwide representation. The following patents relate to the device or usage of the device: US 6,249,089; US 6,952,084; US 6,984,900; US 7,084,526; US 7,084,531; US 8,395,395; US 8,531,120; US 8,659,306; US 8,823,273; US 9,209,803; US 9,360,510; US 9,496,793; US 9,709,614; EP 2,351,220; EP 2,559,164; EP 2,748,927; EP 2,846,465; HK 1,157,080; SA 2001/2151; SA 2006/05363; SA 2014/01541; SA 2015/023634; SA 2017/02224; AirButton , Azoteq , Crystal Driver, IQ Switch , ProxSense , ProxFusion , LightSense™, SwipeSwitch™, and the ® ® ® ® ® logo are trademarks of Azoteq. The information in this Datasheet is believed to be accurate at the time of publication. Azoteq uses reasonable effort to maintain the information up-to-date and accurate, but does not warrant the accuracy, completeness or reliability of the information contained herein. All content and information are provided on an “as is” basis only, without any representations or warranties, express or implied, of any kind, including representations about the suitability of these products or information for any purpose. Azoteq disclaims all warranties and conditions with regard to these products and information, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property rights. Azoteq assumes no liability for any damages or injury arising from any use of the information or the product or caused by, without limitation, failure of performance, error, omission, interruption, defect, delay in operation or transmission, even if Azoteq has been advised of the possibility of such damages. The applications mentioned herein are used solely for the purpose of illustration and Azoteq makes no warranty or representation that such applications will be suitable withou t further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. Azoteq products are not authorized for use as critical components in life support devices or systems. No licenses to patents are granted, implicitly, express or implied, by estoppel or otherwise, under any intellectual property rights. In the event that any of the abovementioned limitations or exclusions does not apply, it is agreed that Azoteq’s total liability for all losses, damages and causes of action (in contract, tort (including without limitation, negligence) or otherwise) will not exceed the amount already paid by the customer for the products. Azoteq reserves the right to alter its products, to make co rrections, deletions, modifications, enhancements, improvements and other changes to the content and information, its products, programs and services at any time or to move or discontinue a ny contents, products, programs or services without prior notification. For the most up-to-date information and binding Terms and Conditions please refer to www.azoteq.com. www.azoteq.com/ip info@azoteq.com Copyright © Azoteq 2018 All Rights Reserved IQS211A Datasheet v1.3 Check for latest datasheet OTP summary Memory map summary Page 30 of 30 March 2018