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  • bq27532-G1 Battery Management Unit Impedance Track Fuel Gauge for bq2425x Charger

    • SLUSBU6B September   2014  – January 2016

      PRODUCTION DATA.  

  • CONTENTS
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  • bq27532-G1 Battery Management Unit Impedance Track Fuel Gauge for bq2425x Charger
  1. 1 Features
  2. 2  Applications
  3. 3  Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics: Supply Current
    6. 6.6  Digital Input and Output DC Electrical Characteristics
    7. 6.7  Power-on Reset
    8. 6.8  2.5-V LDO Regulator
    9. 6.9  Internal Clock Oscillators
    10. 6.10 ADC (Temperature and Cell Measurement) Characteristics
    11. 6.11 Integrating ADC (Coulomb Counter) Characteristics
    12. 6.12 Data Flash Memory Characteristics
    13. 6.13 I2C-compatible Interface Communication Timing Requirements
    14. 6.14 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Functional Description
    4. 7.4 Device Functional Modes
      1. 7.4.1 Power Modes
      2. 7.4.2 BAT INSERT CHECK Mode
      3. 7.4.3 NORMAL Mode
      4. 7.4.4 SLEEP Mode
      5. 7.4.5 SLEEP+ Mode
      6. 7.4.6 HIBERNATE Mode
    5. 7.5 Programming
      1. 7.5.1 Standard Data Commands
      2. 7.5.2 Control( ): 0x00 and 0x01
      3. 7.5.3 Charger Data Commands
      4. 7.5.4 Communications
        1. 7.5.4.1 I2C Interface
        2. 7.5.4.2 I2C Time Out
        3. 7.5.4.3 I2C Command Waiting Time
        4. 7.5.4.4 I2C Clock Stretching
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 BAT Voltage Sense Input
        2. 8.2.2.2 SRP and SRN Current Sense Inputs
        3. 8.2.2.3 Sense Resistor Selection
        4. 8.2.2.4 TS Temperature Sense Input
        5. 8.2.2.5 Thermistor Selection
        6. 8.2.2.6 REGIN Power Supply Input Filtering
        7. 8.2.2.7 VCC LDO Output Filtering
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
    1. 9.1 Power Supply Decoupling
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Sense Resistor Connections
      2. 10.1.2 Thermistor Connections
      3. 10.1.3 High-Current and Low-Current Path Separation
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
  13. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • YZF|15
    • MXBG070J
Thermal pad, mechanical data (Package|Pins)
Orderable Information
  • slusbu6b_oa
  • slusbu6b_pm
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DATA SHEET

bq27532-G1 Battery Management Unit Impedance Track Fuel Gauge for bq2425x Charger

1 Features

  • Battery Fuel Gauge and Charger Controller for 1-Cell Li-Ion Applications up to 14,500-mAh Capacity
  • Resides on System Main Board
  • Battery Fuel Gauge Based on Patented Impedance Track™ Technology
    • Models the Battery Discharge Curve for Accurate Remaining Capacity Predictions
    • Automatically Adjusts for Battery Aging, Battery Self-Discharge, and Temperature and Rate Inefficiencies
    • Low-value Sense Resistor (5 to 20 mΩ)
  • Battery Charger Controller With Customizable Charge Profiles
    • Configurable Charge Voltage and Current Based on Temperature
    • Optional State-of-Health (SoH) and Multi-Level Based Charge Profiles
  • Host-free Autonomous Battery Management System
    • Reduced Software Overhead Allows for Easy Portability Across Platforms and Shorter OEM Design Cycles
    • Higher Safety and Security
  • Runtime Improvements
    • Longer Battery Runtime Leveraging Impedance Track™ Technology
    • Tighter Accuracy Controls for Charger Termination
    • Improved Recharge Thresholds
  • Intelligent Charging – Customized and Adaptive Charging Profiles
    • Charger Control Based on SoH
    • Temperature Level Charging (TLC)
  • Stand-alone Battery Charger Controller for bq2425x Single-Cell Switch-mode Battery Charger
  • 400-kHz I2C™ Interface for Connection to System Microcontroller Port

2 Applications

  • Smartphones, Feature Phones, and Tablets
  • Digital Still and Video Cameras
  • Handheld Terminals
  • MP3 or Multimedia Players

3 Description

The bq27532-G1 system-side, Li-Ion battery management unit is a microcontroller peripheral that provides Impedance Track™ fuel gauging and charging control for single-cell Li-Ion battery packs. The fuel gauge requires little system microcontroller firmware development. Together with bq2425x single-cell switch-mode charger, the fuel gauge manages an embedded battery (non-removable) or a removable battery pack.

The fuel gauge uses the patented Impedance Track algorithm for fuel gauging, and provides information, such as remaining battery capacity (mAh), state-of-charge (%), runtime-to-empty (minimum), battery voltage (mV), temperature (°C), and SoH (%).

Battery fuel gauging with the device requires only PACK+ (P+), PACK– (P–), and thermistor (T) connections to a removable battery pack or embedded battery circuit. The 15-pin NanoFree™ (CSP) package has dimensions of 2.61 mm × 1.96 mm with 0.5-mm lead pitch. It is ideal for space-constrained applications.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
bq27532-G1 CSP (15) 2.61 mm × 1.96 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Schematic

bq27532-G1 lusbu6_SimpSch.gif

4 Revision History

Changes from A Revision (October 2015) to B Revision

  • Changed ESD Ratings Go

5 Pin Configuration and Functions

YZF Package
15-Pin CSP
bq27532-G1 bq8035_ds_pinout.gif

Pin Functions

PIN TYPE(1) DESCRIPTION
NAME NUMBER
BAT E2 I Cell-voltage measurement input. ADC input. TI recommends 4.8 V maximum for conversion accuracy.
BI/TOUT E3 IO Battery-insertion detection input. Power pin for pack thermistor network. Thermistor-multiplexer control pin. Use with pullup resistor > 1 MΩ (1.8 MΩ typical).
BSCL B2 O Battery charger clock output line for chipset communication. Use without external pullup resistor. Push-pull output.
BSDA C3 IO Battery charger data line for chipset communication. Use without external pullup resistor. Push-pull output.
CE D2 I Chip enable. Internal LDO is disconnected from REGIN when driven low.
Note: CE has an internal ESD protection diode connected to REGIN. TI recommends maintaining VCE ≤ VREGIN under all conditions.
REGIN E1 P Regulator input. Decouple with 0.1-μF ceramic capacitor to VSS.
SCL A3 I Slave I2C serial communications clock input line for communication with system (master). Open-drain IO. Use with 10-kΩ pullup resistor (typical).
SDA B3 IO Slave I2C serial communications data line for communication with system (master). Open-drain IO. Use with 10-kΩ pullup resistor (typical).
SOC_INT A2 IO SOC state interrupts output. Generates a pulse as described in bq27532-G1 Technical Reference Manual, SLUUB04. Open-drain output.
SRN B1 AI Analog input pin connected to the internal coulomb counter where SRN is nearest the VSS connection. Connect to 5- to 20-mΩ sense resistor.
SRP A1 AI Analog input pin connected to the internal coulomb counter where SRP is nearest the PACK– connection. Connect to 5- to 20-mΩ sense resistor.
TS D3 AI Pack thermistor voltage sense (use 103AT-type thermistor). ADC input.
VCC D1 P Regulator output and bq27532-G1 device power. Decouple with 1-μF ceramic capacitor to VSS. Pin is not intended to power additional external loads.
VSS C1, C2 P Device ground
(1) IO = Digital input-output, AI = Analog input, P = Power connection

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)
MIN MAX UNIT
VREGIN Regulator input –0.3 5.5 V
–0.3 6 (2) V
VCE CE input pin –0.3 VREGIN + 0.3 V
VCC Supply voltage –0.3 2.75 V
VIOD Open-drain IO pins (SDA, SCL, SOC_INT) –0.3 5.5 V
VBAT BAT input pin –0.3 5.5 V
–0.3 6 (2) V
VI Input voltage to all other pins
(BI/TOUT, TS, SRP, SRN, BSCL, BSDA)		 –0.3 VCC + 0.3 V
TA Operating free-air temperature –40 85 °C
Tstg Storage temperature –65 150 °C
(1) Stresses beyond those listed as absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated as recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Condition not to exceed 100 hours at 25°C lifetime.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001, BAT pin(1) ±1500 V
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001, All other pins(1) ±2000
Charged device model(CDM), per JEDEC specification JESD22-C101(2) ±250
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

TA = –40°C to 85°C, VREGIN = VBAT = 3.6 V (unless otherwise noted)
MIN NOM MAX UNIT
VREGIN Supply voltage No operating restrictions 2.8 4.5 V
No flash writes 2.45 2.8
CREGIN External input capacitor for internal LDO between REGIN and VSS Nominal capacitor values specified. Recommend a 5% ceramic X5R-type capacitor located close to the device. 0.1 μF
CLDO25 External output capacitor for internal LDO between VCC and VSS 0.47 1 μF
tPUCD Power-up communication delay 250 ms

6.4 Thermal Information

THERMAL METRIC(1) bq27532-G1 UNIT
YZF (CSP)
15 PINS
RθJA Junction-to-ambient thermal resistance 70 °C/W
RJC(top) Junction-to-case (top) thermal resistance 17 °C/W
RθJB Junction-to-board thermal resistance 20 °C/W
ψJT Junction-to-top characterization parameter 1 °C/W
ψJB Junction-to-board characterization parameter 18 °C/W
RθJC(bottom) Junction-to-case (bottom) thermal resistance n/a °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

6.5 Electrical Characteristics: Supply Current

TA = 25°C and VREGIN = VBAT = 3.6 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
ICC (1) Normal operating-mode current Fuel gauge in NORMAL mode
ILOAD > Sleep current 		118 μA
ISLP+ (1) Sleep+ operating-mode current Fuel gauge in SLEEP+ mode
ILOAD < Sleep current 		62 μA
ISLP (1) Low-power storage-mode current Fuel gauge in SLEEP mode
ILOAD < Sleep current 		23 μA
IHIB (1) Hibernate operating-mode current Fuel gauge in HIBERNATE mode
ILOAD < Hibernate current 		8 μA
(1) Specified by design. Not production tested. Actual supply current consumption will vary slightly depending on firmware operation and dataflash configuration.

6.6 Digital Input and Output DC Electrical Characteristics

TA = –40°C to 85°C, typical values at TA = 25°C and VREGIN = 3.6 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VOL Output voltage, low (SCL, SDA, SOC_INT, BSDA, BSCL) IOL = 3 mA 0.4 V
VOH(PP) Output voltage, high (BSDA, BSCL) IOH = –1 mA VCC – 0.5 V
VOH(OD) Output voltage, high (SDA, SCL, SOC_INT) External pullup resistor connected to VCC VCC – 0.5
VIL Input voltage, low (SDA, SCL) –0.3 0.6 V
Input voltage, low (BI/TOUT) BAT INSERT CHECK MODE active –0.3 0.6
VIH Input voltage, high (SDA, SCL) 1.2 V
Input voltage, high (BI/TOUT) BAT INSERT CHECK MODE active 1.2 VCC + 0.3
VIL(CE) Input voltage, low (CE) VREGIN = 2.8 to 4.5 V 0.8 V
VIH(CE) Input voltage, high (CE) 2.65
Ilkg (1) Input leakage current (IO pins) 0.3 μA
(1) Specified by design. Not production tested.

6.7 Power-on Reset

TA = –40°C to 85°C, typical values at TA = 25°C and VREGIN = 3.6 V (unless otherwise noted)
PARAMETER MIN TYP MAX UNIT
VIT+ Positive-going battery voltage input at VCC 2.05 2.15 2.20 V
VHYS Power-on reset hysteresis 115 mV

6.8 2.5-V LDO Regulator

TA = –40°C to 85°C, CLDO25 = 1 μF, VREGIN = 3.6 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN NOM MAX UNIT
VREG25 Regulator output voltage (VCC) 2.8 V ≤ VREGIN ≤ 4.5 V, IOUT ≤ 16 mA(1) 2.3 2.5 2.6 V
2.45 V ≤ VREGIN < 2.8 V (low battery),
IOUT ≤ 3 mA 		2.3 V
(1) LDO output current, IOUT, is the total load current. LDO regulator should be used to power internal fuel gauge only.

6.9 Internal Clock Oscillators

TA = –40°C to 85°C, 2.4 V < VCC < 2.6 V; typical values at TA = 25°C and VCC = 2.5 V (unless otherwise noted)
PARAMETER MIN TYP MAX UNIT
fOSC High-frequency oscillator 8.389 MHz
fLOSC Low-frequency oscillator 32.768 kHz

6.10 ADC (Temperature and Cell Measurement) Characteristics

TA = –40°C to 85°C, 2.4 V < VCC < 2.6 V; typical values at TA = 25°C and VCC = 2.5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VADC1 Input voltage range (TS) VSS – 0.125 2 V
VADC2 Input voltage range (BAT) VSS – 0.125 5 V
VIN(ADC) Input voltage range 0.05 1 V
GTEMP Internal temperature sensor voltage gain –2 mV/°C
tADC_CONV Conversion time 125 ms
Resolution 14 15 bits
VOS(ADC) Input offset 1 mV
ZADC1 (1) Effective input resistance (TS) 8 MΩ
ZADC2 (1) Effective input resistance (BAT) Device not measuring cell voltage 8 MΩ
Device measuring cell voltage 100 kΩ
Ilkg(ADC) (1) Input leakage current 0.3 μA
(1) Specified by design. Not tested in production.

6.11 Integrating ADC (Coulomb Counter) Characteristics

TA = –40°C to 85°C, 2.4 V < VCC < 2.6 V; typical values at TA = 25°C and VCC = 2.5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VSR Input voltage range,
V(SRP) and V(SRN) 		VSR = V(SRP) – V(SRN) –0.125 0.125 V
tSR_CONV Conversion time Single conversion 1 s
Resolution 14 15 bits
VOS(SR) Input offset 10 μV
INL Integral nonlinearity error ±0.007% ±0.034% FSR
ZIN(SR) (1) Effective input resistance 2.5 MΩ
Ilkg(SR)(1) Input leakage current 0.3 μA
(1) Specified by design. Not tested in production.

6.12 Data Flash Memory Characteristics

TA = –40°C to 85°C, 2.4 V < VCC < 2.6 V; typical values at TA = 25°C and VCC = 2.5 V (unless otherwise noted)
PARAMETER MIN TYP MAX UNIT
tDR (1) Data retention 10 Years
Flash-programming write cycles(1) 20,000 Cycles
tWORDPROG (1) Word programming time 2 ms
ICCPROG (1) Flash-write supply current 5 10 mA
tDFERASE (1) Data flash master erase time 200 ms
tIFERASE (1) Instruction flash master erase time 200 ms
tPGERASE (1) Flash page erase time 20 ms
(1) Specified by design. Not production tested

6.13 I2C-compatible Interface Communication Timing Requirements

TA = –40°C to 85°C, 2.4 V < VCC < 2.6 V; typical values at TA = 25°C and VCC = 2.5 V (unless otherwise noted)
MIN TYP MAX UNIT
tr SCL or SDA rise time 300 ns
tf SCL or SDA fall time 300 ns
tw(H) SCL pulse duration (high) 600 ns
tw(L) SCL pulse duration (low) 1.3 μs
tsu(STA) Setup for repeated start 600 ns
td(STA) Start to first falling edge of SCL 600 ns
tsu(DAT) Data setup time 100 ns
th(DAT) Data hold time 0 ns
tsu(STOP) Setup time for stop 600 ns
t(BUF) Bus free time between stop and start 66 μs
fSCL Clock frequency (1) 400 kHz
(1) If the clock frequency (fSCL) is > 100 kHz, use 1-byte write commands for proper operation. All other transactions types are supported at 400 kHz (see I2C Interface and I2C Command Waiting Time).
bq27532-G1 i2c_timing_diagram.gif Figure 1. I2C-Compatible Interface Timing Diagrams

6.14 Typical Characteristics

bq27532-G1 D001_SLUSBU6.gif
Figure 2. Regulator Output Voltage vs. Temperature
bq27532-G1 D003_SLUSBU6.gif
Figure 4. Low-Frequency Oscillator Frequency vs. Temperature
bq27532-G1 D002_SLUSBU6.gif
Figure 3. High-Frequency Oscillator Frequency vs. Temperature
bq27532-G1 D004_SLUSBU6.gif
Figure 5. Reported Internal Temperature Measurement vs. Temperature

 
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