MIC2779L-2BM5-TR

MIC2779 Voltage Monitor with Adjustable Hysteresis Features General Description • Optimized for PDAs, Cellular Telephones, Pagers, and Other Battery-Powered Devices • Independently Adjustable High- and Low-Voltage Thresholds • Internal Logic Prevents Battery Voltage Fluctuation Chatter • High ±2% Voltage Threshold Accuracy • Built-In 140 ms (Minimum) Delay Deglitches Output • Extremely Low 1 µA Typical Supply Current • For Applications that Require Open-Drain Output, See MIC2778/MIC833 • Immune to Brief Power Supply Transients • Available in 5-Lead SOT23 Package The MIC2779 is a voltage monitor that is uniquely designed to detect two separate voltage thresholds combined with a delay generator and logic. It is designed for monitoring the battery supply of portable digital systems, particularly PDAs, pagers, and cellular telephones. Applications • • • • • • PDAs Pagers Cordless Phones Consumer Electronics Embedded Controllers Personal Electronics High- and low-voltage thresholds can be adjusted independently, allowing for wide hysteresis. Voltage detection thresholds are accurate to 2%. If the battery voltage falls below the low-voltage threshold, the output /RST or RST is asserted and latched, preventing system operation until the battery is replaced or recharged. Internal logic prevents the output from chattering due to battery recovery or load removal. The output is asserted for 140 ms (minimum) when a fresh battery is inserted. For applications requiring open-drain output, see MIC2778/MIC833. The IC’s power supply input is separate from the detector inputs, allowing the MIC2779 to be powered from a downstream supply, such a boost converter. Supply current is extremely low (1 μA, typical), making it ideal for portable applications. The MIC2779 is supplied in a 5-lead SOT23 package. Package Types MIC2779H SOT23-5 (M5) (Top View) MIC2779L SOT23-5 (M5) (Top View) LTH GND HTH LTH GND HTH 3 2 1 3 2 1 4 5 4 5 RST VDD /RST VDD  2018 Microchip Technology Inc. DS20006116A-page 1 MIC2779 Typical Application Circuit Cellular Telephone Battery Monitor VOUT 3.0V MIC5207-3.0YM5 Li-Ion Cell Nȍ MIC2779L 1% VDD / R S T LTH Nȍ 1% HTH Nȍ 1% IN OUT BYP EN 470pF 4.7μF GND GND VBAT(hi) = 3.6V VBAT(lo) = 3.1V Functional Block Diagram VDD VB A T T Low-Voltage Detect VLO LTH High-Voltage Detect HTH VHI R Q /RST* S Q RST* One Shot Delay Line 1.24V Bandgap Reference MIC2779 GND * Pinout and polarity vary by device type. See Product Identification System section. DS20006116A-page 2  2018 Microchip Technology Inc. MIC2779 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings † Supply Voltage (VDD) ................................................................................................................................... –0.3V to +7V Input Voltages (VLTH, VHTH, V/RST, VRST) .................................................................................................... –0.3V to +7V /RST, RST Output Current (I/RST, IRST)...................................................................................................................20 mA Storage Temperature (TS)...................................................................................................................... –65°C to +150°C ESD Rating (Note 1) .................................................................................................................................................. 2 kV Operating Ratings †† Supply Voltage (VDD, Note 2).................................................................................................................... +1.5V to +5.5V Input Voltages (VLTH, VHTH, V/RST, VRST) ................................................................................................. –0.3V to +6.0V Ambient Temperature Range (TA)............................................................................................................ –40°C to +85°C Package Thermal Resistance 5-Ld SOT23 ........................................................................................................................................................256°C/W † Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods may affect device reliability. †† Notice: The device is not guaranteed to function outside its operating ratings. Note 1: Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5 kΩ in series with 100 pF. 2: VDD operating range is 1.5V to 5.5V. Output is guaranteed to be held low, down to VDD = 1.2V.  2018 Microchip Technology Inc. DS20006116A-page 3 MIC2779 ELECTRICAL CHARACTERISTICS Electrical Characteristics: 1.5V ≤ VDD ≤ 5.5V; TA = +25°C, bold values indicate –40°C ≤ TA ≤ +85°C, unless noted. Parameter Supply Current Input Leakage Current Sym. Min. Typ. Max. Units IDD — 1 2 µA — 5 — pA — — 10 nA — 1.240 — 1.215 — 1.265 ILTH, IHTH Conditions /RST, RST not asserted — — Reference Voltage VREF Propagation Delay tD — 5 — µs VLTH = VREF(MAX) +100 mV to VREF(MIN) – 100 mV Reset Pulse Width tRESET 140 — 420 ms — — — 0.3 Reset Output Low Voltage Reset Output High Voltage V MIC2779H/L-2 /RST asserted or RST not asserted, ISINK = 1.6 mA, VDD ≥ 1.6V V VOL — — 0.4 /RST asserted or RST not asserted, ISINK = 100 µA, VDD ≥ 1.2V 0.8VDD — — /RST not asserted or RST asserted, ISOURCE = 500 µA, VDD ≥ 1.6V 0.8VDD — — V VOH /RST not asserted or RST asserted, ISOURCE = 50 µA, VDD ≥ 1.2V Timing Diagram A VBATT VHTH VLTH A 0V V/RST VOH VOL VRST VOH VOL tRST tRST Propagation delays not shown for clarity. The MIC2779 ignores very brief transients. See the Application Information section for details. DS20006116A-page 4  2018 Microchip Technology Inc. MIC2779 TEMPERATURE SPECIFICATIONS Parameters Sym. Min. Typ. Max. Units Conditions Ambient Temperature Range TA –40 — +85 °C — Storage Temperature Range TS –65 — +150 °C — JA — 256 — °C/W — Temperature Ranges Package Thermal Resistances Thermal Resistance, SOT23-5 Note 1: The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the maximum allowable power dissipation will cause the device operating junction temperature to exceed the maximum +85°C rating. Sustained junction temperatures above +85°C can impact the device reliability.  2018 Microchip Technology Inc. DS20006116A-page 5 MIC2779 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: Pin Number MIC2779H PIN FUNCTION TABLE Pin Number MIC2779L Pin Name Description High-Voltage Threshold (Input): Analog input to a comparator. When the level on this pin initially rises above VREF, the delay generator cycles and the /RST remains low or RST remains high for a minimum of 140 ms. 1 1 HTH 2 2 GND Ground. LTH Low-Voltage Threshold (Input): Analog input to a comparator. This is the voltage monitor input assigned to detect a low voltage condition. When the level on this pin falls below VREF, /RST or RST is asserted and the condition is latched until VHTH > VREF. RST Reset (Output): Push-pull output. This output is asserted and latched when VLTH < VREF, indicating a low voltage condition. This state remains latched until VHTH > VREF. The polarity of this signal (active-high or low) is determined by the part number suffix. See Product Identification System. 3 4 3 — — 4 /RST Reset (Output): Push-pull output. This output is asserted and latched when VLTH < VREF, indicating a low voltage condition. This state remains latched until VHTH > VREF. The polarity of this signal (active-high or low) is determined by the part number suffix. See Product Identification System. 5 5 VDD Power Supply (Input): Independent supply input for internal circuitry. DS20006116A-page 6  2018 Microchip Technology Inc. MIC2779 3.0 FUNCTIONAL DESCRIPTION The MIC2779 monitors the voltage of a battery and detects when it is discharged below a programmed level. Upon being replaced, or being recharged above a second higher programmed trip point, the output remains low (MIC2779L) or high (MIC2779H) for a minimum of 140 ms and then sends a reset signal to a microprocessor or other downstream component. See the Timing Diagram. 3.1 /RST, RST Low Output The output is a push-pull logic signal that is asserted when the MIC2779 detects a low input voltage. The /RST output of MIC2779L is active-low; the RST output of MIC2779H is active-high. 3.2 Trip Points Battery voltage is monitored by a comparator via a voltage divider network. The divided voltage is compared to an internal reference voltage. When the voltage at the LTH input pin drops below the internal reference voltage, the output is asserted. At this point, the voltage at HTH is assumed to be below the reference voltage. 3.3 Delay At power-on or when the battery is replaced or recharged, and the voltage at HTH exceeds the reference voltage, the output is deasserted after a minimum delay of 140 ms.  2018 Microchip Technology Inc. DS20006116A-page 7 MIC2779 4.0 APPLICATION INFORMATION 4.1 Programming the Thresholds The low-voltage Equation 4-1. threshold is calculated EQUATION 4-3: 1M V BAT  HI  = 1.24   -------------  R3  using R3 = 344k EQUATION 4-1: Once R3 is determined, the equation for VBAT(LO) can be used to determine R2. A single lithium-ion cell should not be discharged below 2.5V. Many applications limit the drain to 3.1V. Using 3.1V for the VBAT(LO) threshold allows one to calculate the values of the two remaining resistor values. R1 + R2 + R3 V BAT  LO  = V REF   ---------------------------------  R2 + R3  Where: VREF = 1.240V The high-voltage Equation 4-2. threshold is calculated using EQUATION 4-4: EQUATION 4-2: 1M V BAT  LO  = 3.1V = 1.24   ------------------------------ R2 + 344k R1 + R2 + R3 V BAT  HI  = V REF   ---------------------------------   R3 R2 = 56k Where: VREF = 1.240V R1 = 1M – R2 – R3 When working with large resistors, a small amount of leakage current can cause voltage offsets that degrade system accuracy. The maximum recommended total resistance from VBAT to ground is 3 MΩ. VB A T T R 1 Nȍ 1% R 2 Nȍ 1% MIC2779 VDD / R S T R ST LTH HTH GND R 3 Nȍ 1% FIGURE 4-1: Example Circuit. Once the desired trip points are determined, set the VBAT(HI) threshold first. For example, use a total of 1 MΩ = R1 + R2 + R3. For a typical single-cell lithium-ion battery, 3.6V is a good “high threshold” because at 3.6V the battery is moderately charged. Solving for R3: DS20006116A-page 8 R1 = 600k The accuracy of the resistors can be chosen based upon the accuracy required by the system. 4.2 Input Transients The MIC2779 is inherently immune to very short negative going glitches. Very brief transients may exceed the VBAT(LO) threshold without tripping the output. As shown in Figure 4-2, the narrower the transient, the deeper the threshold overdrive that will be ignored by the MIC2779. The graph represents the typical allowable transient duration for a given amount of threshold overdrive that will not generate a reset. MAX. TRANSIENT DURATION (μs) In order to provide the additional criteria needed to solve for the resistor values, the resistors can be selected such that they have a given total value, that is, R1 + R2 + R3 = RTOTAL. A value such as 1 MΩ for RTOTAL is a reasonable value because it draws minimum battery current, but has no measurable effect on accuracy. 140 120 100 80 60 40 20 0 1 10 100 1000 RESET COMP. OVERDRIVE, VREF –VLTH (mV) FIGURE 4-2: Input Transient Response.  2018 Microchip Technology Inc. MIC2779 5.0 PACKAGING INFORMATION 5.1 Package Marking Information 5-Lead SOT23* Example XXXX NNN UPB1 288 Legend: XX...X Y YY WW NNN e3 * Product code or customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week ‘01’) Alphanumeric traceability code Pb-free JEDEC® designator for Matte Tin (Sn) This package is Pb-free. The Pb-free JEDEC designator ( e3 ) can be found on the outer packaging for this package. ●, ▲, ▼ Pin one index is identified by a dot, delta up, or delta down (triangle mark). Note: In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. Package may or may not include the corporate logo. Underbar (_) and/or Overbar (⎯) symbol may not be to scale.  2018 Microchip Technology Inc. DS20006116A-page 9 MIC2779 5-Lead SOT23 Package Outline & Recommended Land Pattern Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging. DS20006116A-page 10  2018 Microchip Technology Inc. MIC2779 APPENDIX A: REVISION HISTORY Revision A (November 2018) • Converted Micrel document MIC2779 to Microchip data sheet template DS20006116A. • Minor grammatical text changes throughout. • Removed all reference to the 1% accuracy part option.  2018 Microchip Technology Inc. DS20006116A-page 11 MIC2779 NOTES: DS20006116A-page 12  2018 Microchip Technology Inc. MIC2779 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office. Examples: Device X -X X XX -XX Part No. Output Polarity Accuracy Junction Temp. Range Package Media Type Device: MIC2779: Voltage Monitor with Adjustable Hysteresis Output Polarity: H = Active-High RST L = Active-Low /RST Accuracy: -2 = Accurate to 2% Junction Temperature Range: Y = –40°C to +85°C, RoHS-Compliant Package: M5 = 5-Lead SOT23 Media Type: TR a) MIC2779H-2YM5-TR: b) MIC2779L-2YM5-TR: Note 1: MIC2779, Active-High RST, Accurate to 2%, –40°C to +85°C Temperature Range, 5-Lead SOT23, 3,000/Reel MIC2779, Active-Low /RST, Accurate to 2%, –40°C to +85°C Temperature Range, 5-Lead SOT23, 3,000/Reel Tape and Reel identifier only appears in the catalog part number description. This identifier is used for ordering purposes and is not printed on the device package. Check with your Microchip Sales Office for package availability with the Tape and Reel option. = 3,000/Reel  2018 Microchip Technology Inc. DS20006116A-page 13 MIC2779 NOTES: DS20006116A-page 14  2018 Microchip Technology Inc. Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. • Microchip is willing to work with the customer who is concerned about the integrity of their code. • Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.” Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights unless otherwise stated. Trademarks Microchip received ISO/TS-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV The Microchip name and logo, the Microchip logo, AnyRate, AVR, AVR logo, AVR Freaks, BitCloud, chipKIT, chipKIT logo, CryptoMemory, CryptoRF, dsPIC, FlashFlex, flexPWR, Heldo, JukeBlox, KeeLoq, Kleer, LANCheck, LINK MD, maXStylus, maXTouch, MediaLB, megaAVR, MOST, MOST logo, MPLAB, OptoLyzer, PIC, picoPower, PICSTART, PIC32 logo, Prochip Designer, QTouch, SAM-BA, SpyNIC, SST, SST Logo, SuperFlash, tinyAVR, UNI/O, and XMEGA are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. ClockWorks, The Embedded Control Solutions Company, EtherSynch, Hyper Speed Control, HyperLight Load, IntelliMOS, mTouch, Precision Edge, and Quiet-Wire are registered trademarks of Microchip Technology Incorporated in the U.S.A. Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any Capacitor, AnyIn, AnyOut, BodyCom, CodeGuard, CryptoAuthentication, CryptoAutomotive, CryptoCompanion, CryptoController, dsPICDEM, dsPICDEM.net, Dynamic Average Matching, DAM, ECAN, EtherGREEN, In-Circuit Serial Programming, ICSP, INICnet, Inter-Chip Connectivity, JitterBlocker, KleerNet, KleerNet logo, memBrain, Mindi, MiWi, motorBench, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, PowerSmart, PureSilicon, QMatrix, REAL ICE, Ripple Blocker, SAM-ICE, Serial Quad I/O, SMART-I.S., SQI, SuperSwitcher, SuperSwitcher II, Total Endurance, TSHARC, USBCheck, VariSense, ViewSpan, WiperLock, Wireless DNA, and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries. GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. All other trademarks mentioned herein are property of their respective companies. © 2018, Microchip Technology Incorporated, All Rights Reserved. ISBN: 978-1-5224-3882-3 == ISO/TS 16949 ==  2018 Microchip Technology Inc. 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