STK3311-X

STK3311-X Ambient Light Sensor and Proximity Sensor with Built-in IR LED Preliminary Datasheet Version - 0.9.2 2016/01/25 STK3311-X REV 0.9.2 1. OVERVIEW
Description The STK3311-X is an integrated ambient and infrared 2 light to digital converter with a built-in IR LED and I C interface. This device provides not only ambient light sensing to allow robust backlight/display brightness control but also infrared sensing to allow proximity estimation featured with interrupt function.

For ambient light sensing, the STK3311-X incorporates a photodiode, timing controller and ADC in a single chip. The excellent spectral response is designed to be closeto human eye. The STK3311-X is suitable for detecting a wide range of light intensity environment.

For proximity sensing, the STK3311-X also incorporates a photodiode, timing controller and ADC in the same chip. The spectral response of STK3311-X is optimized for wavelength 940nm infrared light. The STK3311-X provides programmable duty setting to drive IR LED and employs a noise cancellation scheme to highly reject unwanted ambient IR noise.
The proximity sensor is optimized so that the black card at 0-cm can be detected. Please contact with sensortek for further application solution.





The STK3311-X has excellent temperature compensation, robust on-chip refresh rate setting without external components. Software shutdown mode control is provided for power saving application. The STK3311-X operating voltage range is 1.7V to 3.6V.
940nm LED for STK3311-X. Ambient Light Sensor Convert ambient light intensity to 16-bit digital data format 3rd generation ambient light sensor which closes to human-eye response and suppress IR portion – Read the Illuminance directly; unlike conventional solution calculated from two diodes’ data Flexible digital settings – Integration time : 0.2ms~6400ms Flexible interrupt setting – Interrupt while out-of- window – Persistence : 1 / 4 times IR sensing mode General 2 Fully digital control with I C interface 2 – 1.7 ~ 3.6V I C interface Low power design – Standby mode – Wait mode Time-multiplexing for sensing VDD wide operation voltage : 1.7~3.6V Excellent temperature compensation: -40 to 85°C Available package options: OLGA – STK3311-X : 3.94x2.36x1.35(mm) Lead-free package (RoHS compliant) Applications
Mobile Phone, Smart-phone, PDA Feature





Integrated ambient light sensor, proximity sensor and infrared LED in one package. Proximity Sensor 16 bits resolution for proximity detection Built-in LED driver with flexible setting – LED turn-on time : 16 steps IT x 64 duty cycle options – LED current : 12.5 / 25 / 50 / 100 mA Flexible interrupt setting – Several interrupt modes meet application requirements. – Flag modes are included. – Interrupt persistence : 1 / 4 times Low noise design Ambient IR noise cancellation – Immunity to 50Hz/60Hz fluorescent light flicker www.sensortek.com.tw 1 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 www.sensortek.com.tw 2 I2C Interface FUNCTION BLOCK T-CON 2. @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 3. PINOUT DIAGRAM VDD 8 1 SDA Detector SCL 7 2 INT GND 6 3 LDR LEDA 5 4 NC IR Emitter STK3311-X Top View 4. Pin No. Pin Name PIN DESCRIPTION Dir. Pin Function 2 1 SDA B I C serial data line. (Open Drain) 2 /INT O Interrupt pin, LO for interrupt alarming. (Open Drain) 3 LDR I IR LED driver pin connecting to the cathode of the external IR LED. 2 The sink current of the IR LED driver can be programmed through I C or the external resistor. 4 NC 5 LEDA I 6 GND GND 7 SCL I 8 VDD PWR No Connect. Anode of the embedded IR LED, connect to power. Ground. The thermal pad is also connected to the GND pin. 2 I C serial clock line. Power supply: 1.7V to 3.6V. Direction denotation: O I PWR www.sensortek.com.tw Output Input Power GND B NC 3 Ground Bi-direction Not Connect @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 5. ELECTRICAL SPECIFICATIONS Absolute Maximum Ratings Symbol Parameter Min. Typ. Max. Unit VDD Supply voltage -0.3 — 3.8 V VLEDA Voltage of LED’s anode -0.3 — 4.7 V VLDR Voltage of LDR 3.8 V Ta Operation temperature -40 — 85 °C Ts Storage temperature -40 — 85 °C Min. Typ. Max. Unit 1.7 — 3.6 V 2.4 — 4.6 V NOTE: All voltages are measured with respect to GND Recommended Operating Conditions Symbol VDD VLEDA Parameter Supply voltage Voltage of LED’s anode 2 fI2C Clock frequency of I C — — 400 KHz Ta Operation temperature -40 — 85 °C NOTE: All voltages are measured with respect to GND Symbol Parameter Max. Unit ESD Electrostatic discharge protection 2 (HBM) 200 (MM) 100 (Latch Up) kV V mA NOTE: All voltages are measured with respect to GND 5.1 Electrical and Optical Characteristics VDD = VLED = 2.8V, under room temperature 25°C (unl ess otherwise noted) Symbol Parameter Operation Characteristics IALS ALS only supply current IPS PS only supply current IWAIT Supply current at wait state ISD Shutdown current VIH Logic high, I2C 2 VIL Logic low, I C ALS Characteristics Peak sensitivity wavelength for ALS λp1 ALSFSCNT Full scale ALS counts ALSDARK ALS dark offset ALSSENSE ALS sensing tolerance www.sensortek.com.tw Condition Note1,2 Note1,2 Note1,2 Note1,2 Note6 Note7 Min. Typ. 90 100 29 0.2 1.3 — Max. Unit 1 VDD 0.4 µA µA µA µA V V 65535 3 ±10 nm counts counts % 550 Note2,3,4 Note2,3 4 0 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 Proximity Characteristics High sensitivity wavelength range λp2 for PS PSFSCNT Full scale PS counts 800 1000 nm 65535 counts IRDR_LED[1:0] Note5 ILEDSINK 00 01 10 11 LED sink current 12.5 25 50 100 mA mA mA mA steps LEDDUTY LED duty adjust steps 64 Note 1 : No LED operation. Note 2 : GAIN_ALS[1:0] = 2’b11, .IT_ALS[3:0] = 4’b1001, GAIN_PS[1:0] = 2’b11, .IT_PS[3:0] = 4’b0001. Note 3 : White LED parallel light source. Note 4 : Eambient = 0 Lux. Note 5 : The voltage of LDR pin is fixed at 1V. 2 Note 6 : I C logical high voltage level is specified as worst-case condition when all of the recommended operation supply voltages (VDD) are taken into consideration. The logical high level is different when different supply voltage is applied. 2 Note 7 : I C logical low voltage level is specified as worst-case condition when all of the recommended operation supply voltages (VDD) are taken into consideration. The logical low level is different when different supply voltage is applied. 5.2 Timing Chart Characteristics of the SDA and SCL I/O Symbol Parameter fSCLK SCL clock frequency Hold time after (repeated) start condition. After tHDSTA this period, the first clock is generated tLOW LOW period of the SCL clock tHIGH HIGH period of the SCL clock tSUSTA Set-up time for a repeated START condition tHDDAT Data hold time tSUDAT Data set-up time tr Rise time of both SDA and SCL signals tf Fall time of both SDA and SCL signals tSUSTO Set-up time for STOP condition Bus free time between a STOP and START tBUF condition -1 Note 1: fSCLK is the (tSCLK) . www.sensortek.com.tw 5 Standard Mode Min. Max. 10 100 Fast Mode Min. Max. 10 400 Unit KHz 4.0 — 0.6 — µs 4.7 4.0 4.7 0 250 — — 4.0 — — — — — 1000 300 — 1.3 0.6 0.6 0 100 — — 0.6 — — — — — 300 300 — µs µs µs ns ns ns ns µs 4.7 — 1.3 — µs @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 Timing Chart of the SDA and SCL Write Command Read Data Sequential Read Data www.sensortek.com.tw 6 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 6. PRINPICLE OF OPERATION Digital Interface 2 STK3311-X contains eight-bit registers accessed via the I C bus. All operations can be controlled by the command register. The simple command structure makes user easy to program the operation setting and latch the output data 2 from STK3311-X. Section 5.2 Timing chart displays the STK3311-X I C command format for reading and writing operation between host and STK3311-X. 6.1 General Operations Slave Address 2 STK3311-X provides fixed I C slave address of 0x48 using 7 bit addressing protocol. Slave Address 0x48 (followed by the R/W bit) R/W Command Bit 0 1 OPERATION Write Command to STK3311-X Read Data form STK3311-X Function Description There are 19 registers available in the STK3311-X. Their functions are summarized in the following table. BIT ADDR REG NAME 7 6 5 4 3 EN_ASO EN_IRO 2 1 0 EN_ALS EN_PS Default 00h STATE 01h PSCTRL PRS_PS[1:0] GAIN_PS[1:0] IT_PS[3:0] 31h 02h ALSCTRL PRS_ALS[1:0] GAIN_ALS[1:0] IT_ALS[3:0] 39h 03h LEDCTRL 04h INT 05h WAIT WAIT[7:0] 00h 06h THDH1_PS THDH_PS[15:8] FFh 07h THDH2_PS THDH_PS[7:0] FFh 08h THDL1_PS THDL_PS[15:8] 00h 09h THDL2_PS THDL_PS[7:0] 00h 0Ah THDH1_ALS THDH_ALS[15:8] FFh 0Bh THDH2_ALS THDH_ALS[7:0] FFh 0Ch THDL1_ALS THDL_ ALS[15:8] 00h THDL_ ALS[7:0] FLG_PSI NT DATA_PS[15:8] 00h 0Dh EN_IRS IRDR_LED[1:0] FLAG 11h DATA1_PS FLG_AL SDR FLG_PS DR FLG_ALS INT INT_ALS 00h INT_PS[2:0] FLG_OUI 00h FFh DT_LED[5:0] INT_OUI INT_CTRL THDL2_ALS 10h EN_WAIT FLG_IR _RDY FLG_NF 01h 00h 12h DATA2_PS DATA_PS[7:0] 00h 13h DATA1_ALS DATA_ALS[15:8] 00h 14h DATA2_ALS DATA_ALS[7:0] 00h 15h DATA1_OFFSET DATA_OFFSET[15:8] 00h 16h DATA2_OFFSET DATA_OFFSET[7:0] 00h 17h DATA1_IR DATA_IR[15:8] 00h 18h DATA2_IR 3Eh PDT_ID 3Fh Reserved www.sensortek.com.tw 00h DATA_ IR[7:0] 0 0 0 1 0 0 1 0 12h Reserved 7 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 80h SOFT_RESET Write to soft reset STATE Register (00h) 1. EN_PS ( Bit[0] ), EN_ALS ( Bit[1] ), EN_WAIT ( Bit[2] ) : These bits are used to define what state for the device to be. The operation state flow will be stated later. BIT [2:0] Description 000 Standby 001 No Wait Time, Disable ALS, Enable PS 010 No Wait Time, Enable ALS, Disable PS 011 No Wait Time, Enable ALS, Enable PS 100 Not Applied 101 Set Wait Time, Disable ALS, Enable PS 110 Set Wait Time, Enable ALS, Disable PS 111 Set Wait Time, Enable ALS, Enable PS 2. EN_IRO ( Bit[4] ) : To enable (1) / disable (0) Interrupt Run Once function while Interrupt Run Once will be stated in the later section. 3. EN_ASO ( Bit[5] ) : To enable (1) / disable (0) PS DATA stored in register 11h/12h is the result that ADC output subtract offset data stored in register 15h/16h. This is used to cancel the system cross talk (offset). ex: DATA_PS[15:0] = DATA_PS_ADC – DATA_OFFSET[15:0] where DATA_PS_ADC is the ADC output while PS conversion is completed. 4. EN_IRS ( Bit[7] ) : To enable (1) / disable (0) IR sensing function. It will update DATA_IR[15:0] (register 17h/18h) once and set FLG_IR_RDY to 1. The IR sensing function is a one-time measurement. If another measure is needed, EN_IRS shall be disabled first and enable. IR sensing and FLG_IR_RDY will be stated in the later section. PSCTRL Register (01h) 1. IT_PS[3:0] ( Bit[3:0] ) : The refresh time of PS can be tuned by IT_PS[3:0]. Through setting IT_PS[3:0], user could achieve very wide range flexibly in choosing refresh time for different application demand. It is suggested to choose IT_PS time less than 1.56ms to minimize the influence coming from flicker noise. STK3311-X takes 2 times of IT_PS to perform proximity sensing. The default value of IT_PS is 0.37ms. BIT [3:0] REFRESH TIME Multiple of Base Refresh Time 0000 0.185 ms (Base Refresh Time) x1 0001 0.37 ms x2 0010 0.741 ms x4 ….. ……. ….. 1111 6070 ms x 32768 2. GAIN_PS[1:0] ( Bit[5:4] ) : The Gain setting for PS sensitivity range is summarized in following table. It is suggested to choose x64 gain setting to get the optimum performance. The default value of GAIN_PS is x64. BIT [5:4] Gain 00 x1 01 x4 10 x16 11 x64 www.sensortek.com.tw 8 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 3. PRS_PS[1:0] ( Bit[7:6] ) : The PS has an interrupt persistence filter. The persistence filter allows user to specify the number of consecutive out-of-threshold PS occurrences before an interrupt is triggered. BIT [7:6] Consecutive Out-of-threshold PS Occurrences 00 1 time 01 4 times ALSCTRL Register (02h) 1. IT_ALS[3:0] ( Bit[3:0] ) : The refresh time of ALS can be tuned by IT_ALS. Through setting IT_ALS, user could achieve very wide range flexibly in choosing refresh time for different application demand. The default value of IT_ALS is 94.85ms. (IT_ALS[3:0]=4’b1001) BIT [3:0] 0000 0001 0010 ….. 1000 1001 1010 ….. 1111 REFRESH TIME 0.185 ms 0.37 ms 0.741 ms ……. 47.36 ms 94.85 ms 189.44 ms ……. 6062 ms Multiple of Base Refresh Time x1 x2 x4 ….. x 256 x 512 x 1024 ….. x 32768 LUX/LSB under GAIN_ALS = 2’b11 ….. ….. (IT_ALS[3:0]-9) 0.027 / 2 ….. 0.054 0.027 0.0135 ….. ….. 2. GAIN_ALS[1:0] ( Bit[5:4] ) : The Gain setting for ALS sensitivity range is summarized in following table. It is suggested to choose x64 gain setting to get the optimum performance. The default value of GAIN_ALS is x64. BIT [5:4] Gain LUX/LSB under IT_ALS = 4’b1001 00 x1 1.728 01 x4 0.432 10 x16 0.108 11 x64 0.027 3. PRS_ALS[1:0] ( Bit[7:6] ) : The ALS has an interrupt persistence filter. The persistence filter allows user to specify the number of consecutive out-of-threshold ALS occurrences before an interrupt is triggered. BIT [7:6] Consecutive Out-of-threshold ALS Occurrences 00 1 time 01 4 times LEDCTRL Register (03h) 1. DT_LED[5:0] ( Bit[5:0] ) : IRLED driving ON-duty (with respect to refresh time) could be adjusted through DT_LED. Through setting DT_LED, IRLED ON-duty period can vary from 1/64 to 64/64 of the set IT_PS time. For the following example table, when the IT_PS[3:0] = 4’b0000 (PS refresh time is 0.185ms), user may set the IRLED ON-duty period 1/64 of 0.185ms (= 2.89us) by defining DT_LED[5:0] = 6’b000000. By following this, user can choose the desired LED ON-duty period for STK3311-X. BIT [5:0] IRLED ON-Duty Period IRLED ON-Duty Period under IT_PS = 0000 000000 IT_PS X 1/64 2.89 us 000001 IT_PS X 2/64 5.78 us …….. …. ………. www.sensortek.com.tw 9 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 111111 IT_PS X 64/64 0.185 ms 2. IRDR[1:0] ( Bit[7:6] ) : The STK3311-X provides different driving ability for IRLED through setting IRDR. BIT [7:6] IRLED Driving Current 00 12.5mA current sink 01 25mA current sink 10 50mA current sink 11 100mA current sink www.sensortek.com.tw 10 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 System Operation State Normal Mode The STK3311-X provides control of ALS, proximity detection, and power management functionality through an internal state machine. After a power-on-reset, the device is in the standby mode. As soon as EN_WAIT or EN_ALS or EN_PS is set to 1, the device will move to the start state. It will then continue go through the PS, Wait, and ALS states cyclic. If these states are enabled, the device will execute each function. If EN_WAIT, EN_ALS or EN_PS is changed during active mode it will jump to start state immediately and remains the data of registers DATA_PS and DATA_ALS without updating. It will go into a low power standby mode again only when EN_WAIT, EN_ALS and EN_PS are all set to 0. www.sensortek.com.tw 11 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 Interrupt Run Once mode STK3311-X is provided IRO mode to save power and simplify system control. While EN_IRO is enabled, the state machine will go to standby mode after PS/ALS interrupt event triggered and IC will stop sensing for saving power. The state machine will leave standby mode once the FLG_PSINT or FLG_ALSINT is cleared. Please see the following state diagram. Standby FLG_PSINT or FLG_ALSINT is cleared (EN_IRO && FLG_PSINT) == 1 (EN_ALS && EN_PS) == 0 Start PS (EN_IRO && FLG_ALSINT == 1) ALS Wait www.sensortek.com.tw 12 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 IR Sensing mode While EN_IRS is set, STK3311-X will immediately switch to IR sensing state. The IR sensing function will use the circuit setting of ALS defined in ALSCTRL register to operate the IR sensor to sense incoming light energy in IR range. Once the IR sensing is completed, the DATA_IR[15:0] is updated, EN_IRS bit will be cleared automatically and FLG_IR_RDY bit will be set to 1. The DATA_IR[15:] is not valid until FLG_IR_RDY is set to 1. www.sensortek.com.tw 13 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 Power management Example: Around 100 ms Cycle Time INT Register (04h) 1. INT_PS[2:0] ( Bit[2:0] ) : INT_PS programs interrupt occurrence criteria for PS. BIT [2:0] OPERATION 000 PS INT Disable PS INT Enable, interrupt is issued while FLG_NF is toggled. 001 FLG_NF is defined at bit0 of FLAG Register (10h) to indicate the PS state is near or far. /INT is treated as a flag and not an interrupt. 010 /INT = 1 if DATA_PS[15:0] > THDH_PS[15:0] and /INT = 0 if DATA_PS[15:0] < THDL_PS[15:0]. /INT is treated as a flag and not an interrupt. 011 /INT = 0 if DATA_PS[15:0] > THDH_PS[15:0] and /INT = 1 if DATA_PS[15:0] < THDL_PS[15:0]. PS INT Enable, interrupt according to system pre-defined sequence. Refer to the following 100 description. 101 PS INT Enable, interrupt only if the PS Data value is higher than THDH_PS[15:0]. 110 PS INT Enable, interrupt only if the PS Data value is lower than THDL_PS[15:0]. PS INT Enable, interrupt if the PS Data value is higher than THDH_PS[15:0] or the PS Data value 111 is lower than THDL_PS[15:0]. Threshold hystersis is not applied. www.sensortek.com.tw 14 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 FLAG mode While INT_PS[2:0] is set to 3’b010 or 3’b011. The /INT pin is intended to be used as flag to indicate if any object is proximity to the sensor or not. The MCU or application processor just reads the value of the /INT pin to recognize the 2 state without access the I C interface. /INT can not be cleared by host’s access. If the /INT pin is used as flag, the other interrupt event should be disabled. Usually, the polling mode is used for ambient light sensor while /INT is used as flag of proximity sensing. Interrupt mode /INT is treated as interrupt signal when INT_PS[2:0] other than flag mode are selected. In these modes, the other interrupt source can share the same /INT pin to issue the interrupt event to host. Out-of-Threshold interrupt mode While INT_PS[2:0] is set to 3’b101/3’b110/3’b111, it is so-called “out-of-threshold interrupt”. This interrupt scheme will issue continuous interrupt while the PS_DATA is higher or lower the threshold defined by THDH_PS[15:0] / THDL_PS[15:0]. Recommended interrupt mode The INT_PS[2:0] = 3’b001 is a new scheme which reduces the software’s effort. The /INT is asserted only when proximity state (FLG_NF) is transient. Host just needs to handle the proximity sensor while /INT is asserted and no extra handling for interrupt. DATA_PS THDH_PS THDL_PS FLG_NF Interrupt is asserted for change of FLG_NF FLG_PSINT I2C clear www.sensortek.com.tw 15 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 Compatible interrupt mode While INT_PS[2:0] = 3’b100, the interrupt mode is compatible with STK3171, STK3101 and STK3128. System pre-defined sequence is used to assert interrupt signal. Refer to the following state diagram. Start /INT = HIGH /INT = HIGH Clear FLG_PSINT ** Clear FLG_PSINT ** /INT = HIGH Change detect direction & FLG_NF = 1 False True False Check DATA_PS[15:0] THDH_PS[15:0] True Detect “Near” direction Issue interrupt signal /INT = Low Read DATA_PS[15:0] * Read DATA_PS[15:0] * /INT = Low Detect “Far” direction True Check Threshold_H DATA_PS[15:0] > THDH_PS[15:0] False Check Threshold_L DATA_PS[15:0] < THDL_PS[15:0] Change detect direction & FLG_NF = 0 True Clear FLG_PSINT ** Clear FLG_PSINT ** /INT = HIGH /INT = HIGH False Note : * read DATA_PS is driver’s behavior and it will trigger IC’s next action. ** clear FLG_PSINT is driver’s behavior and it will let /INT pin = HIGH www.sensortek.com.tw 16 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 2. INT_ALS ( Bit[3] ) : INT_ALS = 0, disable ALS interrupt. INT_ALS = 1, enable ALS interrupt. STK3311-X will issue an ALS interrupt if the actual count DATA_ALS are outside the user’s programmed window defined in THDH_ALS and THDL_ALS. The user must write 0 to clear FLG_ALSINT BIT 3 OPERATION 0 ALS interrupt Disable 1 ALS interrupt Enable 3. INT_CTRL ( Bit[7] ) : This bit is used to control the interrupt mode. BIT 7 OPERATION Set /INT pin low if FLG_ALSINT or FLG_PSINT high (logical OR) Set /INT pin low if FLG_ALSINT and FLG_PSINT high (logical AND) 0 1 WAIT Register (05h) 1. WAIT[7:0] ( Bit[7:0] ) : 2 The wait time among every PS and ALS operation can be adjusted via I C. The following table lists the possible values of wait time. BIT [7:0] WAIT TIME 00h 5.93 ms; wait time among every PS and ALS operation is 5.93 ms 01h 11.9 ms; wait time among every PS and ALS operation is 11.9 ms 02h 17.8 ms; wait time among every PS and ALS operation is 17.8 ms ………. ……. FFh 1518 ms; wait time among every PS and ALS operation is 1518 ms PS Threshold Register (06h, 07h, 08h ,09h) A proximity interrupt event (FLG_PSINT) is governed by the high and low thresholds in register 06h, 07h, 08h and 09h respectively. The user write a high and low threshold value to these registers and the STK3311-X will issue an PS interrupt depends on setting of INT_PS[2:0]. ALS Threshold Register (0Ah, 0Bh, 0Ch ,0Dh) An ALS interrupt event (FLG_ALSINT) is governed by the high and low thresholds in register 0Ah, 0Bh, 0Ch and 0Dh respectively. The user write a high and low threshold value to these registers and the STK3311-X will issue an ALS interrupt if the actual count DATA_ALS stored in registers 13h and 14h are outside the user’s programmed window. FLAG Register (10h) 1. FLG_NF ( Bit[0] ) : The definition of FLG_NF depends on the setting of INT_PS[2:0]. INT_PS[2:0] 000 001 010 011 100 101 www.sensortek.com.tw FLG_NF Unused. FLG_NF is fixed to 1. FLG_NF is 0 if object in near to sensor and FLG_NF is 1 if object is far to sensor. Refer to INT_PS[2:0] = 3’b001 in previous description. FLG_NF is 0 if object in near to sensor and FLG_NF is 1 if object is far to sensor. FLG_NF is 0 if object in near to sensor and FLG_NF is 1 if object is far to sensor. FLG_NF is 0 if STK3311-X detection direction is object move from near side to far side. FLG_NF is 1 if STK3311-X detection direction is object move from far side to near side. Unused. FLG_NF is fixed to 1. 17 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 110 111 Unused. FLG_NF is fixed to 1. Unused. FLG_NF is fixed to 1. 2. FLG_IR_RDY ( Bit[1] ) : FLG_IR_RDY default is 0 and will change to be 1 after IR sensing data updated. FLG_IR_RDY need to be cleared to 0 manually. 3. FLG_PSINT ( Bit[4] ) : PS Interrupt flag. This is the status bit of the interrupt for PS. The bit is set to logic high when the interrupt thresholds have been triggered, and logic low when not yet triggered. Once triggered, /INT pin stays low and the status bit stays high. Both interrupt pin and the status bit are cleared by writing “0”. BIT 4 OPERATION 0 Interrupt is cleared or not triggered yet 1 Interrupt is triggered 4. FLG_ALSINT ( Bit[5] ) : ALS Interrupt flag. This is the status bit of the interrupt for ALS. The bit is set to logic high when the interrupt thresholds have been triggered, and logic low when not yet triggered. Once triggered, /INT pin stays low and the status bit stays high. Both interrupt pin and the status bit are cleared by writing “0”. BIT 5 OPERATION 0 Interrupt is cleared or not triggered yet. 1 Interrupt is triggered. 5. FLG_PSDR ( Bit[6] ) : PS Data Ready Flag. This flag is used to confirm whether the PS data in the PS data registers are read or not. The bit will be 1 when the refreshed data is not read. The bit is automatically cleared to zero by STK3311-X after the PS data registers are read. 6. FLG_ALSDR ( Bit[7] ) : ALS Data Ready Flag. This flag is used to confirm whether the ALS data in the ALS data registers are read or not. The bit will be 1 when the refreshed data is not read. The bit is cleared to zero after the ALS data registers are read. PS Data Register (11 and 12 hex) The STK3311-X has two 8-bit read-only registers to hold the data from ADC of PS. The most significant bit (MSB) is accessed at register 11h, and the least significant bit (LSB) is accessed at register 12h. For 16-bit resolution, the data is from DATA_PS[15:0]. The registers are updated for every PS refresh time (conversion cycle). ALS Data Register (13h and 14h) The STK3311-X has two 8-bit read-only registers to hold the data from ADC of ALS. The most significant bit (MSB) is accessed at register 13h, and the least significant bit (LSB) is accessed at register 14h. For 16-bit resolution, the data is from DATA_ALS[15:0]. The registers are updated for every ALS refresh time (conversion cycle). Data Offset Register (15h and 16h) Please refer to the description in state register (00h). Data IR Register (17h and 18h) Please refer to the description in state register (00h). Product ID (3Eh) Read Only; PDT_ID = Product ID to indicate the product information. Reserved (3Fh) Read Only; RSRVD = Reserved for engineering mode. www.sensortek.com.tw 18 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 Soft reset (80h) Write any data to this register will reset the chip. www.sensortek.com.tw 19 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 7. ALS RESPONSE CHARTS ALS Operation Current Variation versus Termperature Standby Current versus Termperature 0.5 5.00% 0.45 0.4 3.00% S tan dby C urrent (uA ) V ariation P e rcen tag e N o rm alize to 2 0 ℃ 4.00% 2.00% 1.00% 0.00% -1.00% -2.00% 0.35 0.3 0.25 0.2 0.15 -3.00% 0.1 -4.00% 0.05 -5.00% 0 -60 -40 -20 0 20 40 60 80 100 -60 Temperature (℃) -20 0 20 40 60 80 100 Temperature (℃) ALS IACT Variation versus Temperature @ VDD = 2.8V, Halogen, ALS-IT = 94.85ms www.sensortek.com.tw -40 ISD versus Temperature @ VDD = 2.8V, Halogen 20 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 8. PROXIMITY CHARACTERISTIC PS Operation Current Variation versus Termperature Variation Percentage Normalize to 20℃ 5.00% 4.00% 3.00% 2.00% 1.00% 0.00% -1.00% -2.00% -3.00% -4.00% -5.00% -60 -40 -20 0 20 40 60 80 100 Temperature (℃) PS IACT Variation versus Temperature @ VDD = 2.8V, LED Driver Current = 104mA, PS-IT = 370us www.sensortek.com.tw 21 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 9. APPLICATION NOTE STK3311-X Typical Application Circuit with Independent VDD and VLED Supply Voltage STK3311-X Typical Application Circuit with Only One Supply Voltage www.sensortek.com.tw 22 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 9.1 Power Noise Consideration In order to reduce the switching noise come from the VLED, it is suggested that IC power and VLED comes from individual source to get the best performance of STK3311-X. The R1 series in the VDD path is strongly recommended that used to filter out the poor system power noise and the recommended value is 22 Ohm. www.sensortek.com.tw 23 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 www.sensortek.com.tw 1.40 0.60 1.35 ± 0.20 2.36 ± 0.20 (1.18) 10. PACKAGE OUTLINE 24 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 PCB Pad Layout Suggested PCB pad layout guidelines for the Dual Flat No-Lead surface mount package are shown below. 0.6 Pin 1 0.80 Notes: all linear dimensions are in mm. www.sensortek.com.tw 25 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 11. SOLDERING INFORMATION 11.1 Soldering Condition 1. Pb-free solder temperature profile 2. Reflow soldering should not be done more than three times. 3. When soldering, do not put stress on the ICs during heating. 4. After soldering, do not warp the circuit board. 11.2 Soldering Iron Each terminal is to go to the tip of soldering iron temperature less than 350°C for 3 seconds within o nce in less than the soldering iron capacity 25W. Leave two seconds and more intervals, and do soldering of each terminal. Be careful because the damage of the product is often started at the time of the hand solder. 11.3 Repairing Repair should not be done after the ICs have been soldered. When repairing is unavoidable, a double-head soldering iron should be used (as below figure). It should be confirmed beforehand whether the characteristics of the ICs will or will not be damaged by repairing. www.sensortek.com.tw 26 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 12. STORAGE INFORMATION 12.1 Storage Condition 1. Devices are packed in moisture barrier bags (MBB) to prevent the products from moisture absorption during transportation and storage. Each bag contains a desiccant. 2. The delivery product should be stored with the conditions shown below: Storage Temperature Relatively Humidity 10 to 30℃ below 60%RH 12.2 Treatment After Unsealed 1. Floor life (time between soldering and removing from MBB) must not exceed the time shown below: Floor Life Storage Temperature Relatively Humidity 168 Hours 10 to 30℃ below 60%RH 2. When the floor life limits have been exceeded or the devices are not stored in dry conditions, they must be rebaked before reflow to prevent damage to the devices. The recommended conditions are shown below Temperature Re-Baking Time www.sensortek.com.tw 60℃ 12 Hours 27 @copyright 2016 Sensortek Technology Corp. STK3311-X REV 0.9.2 Revision History Date 2015/12/17 2016/01/05 2016/01/25 Version 0.9 0.9.1 0.9.2 Modified Items Initial release. Fix typo Fix PID Important Notice This document contains information that is proprietary to Sensortek Technology Corp. (“sensortek”), and is subject to change without notice. Any part of this document may not be used, reproduced, duplicated or disclosed in any form or any means without the prior written permission of sensortek. Sensortek does not warrant or represent that any license, either express or implied, is granted under any sensortek‘s patent right, copyright, mask work right, or other intellectual property right relating to any combination, machine, or process in which sensortek‘s products or services are used. In addition, Sensortek does not assume any liability for the occurrence of infringing on any patent or other intellectual property rights of a third party. Sensortek reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. www.sensortek.com.tw 28 @copyright 2016 Sensortek Technology Corp.