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  • bq27320 Single-Cell CEDV Fuel Gauge

    • SLUSCG9A February   2016  – March 2016

      PRODUCTION DATA.  

  • CONTENTS
  • SEARCH
  • bq27320 Single-Cell CEDV Fuel Gauge
  1. 1 Features
  2. 2  Applications
  3. 3  Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Supply Current
    6. 7.6  Digital Input and Output DC Characteristics
    7. 7.7  Power-On Reset
    8. 7.8  2.5-V LDO Regulator
    9. 7.9  Internal Clock Oscillators
    10. 7.10 ADC (Temperature and Cell Measurement) Characteristics
    11. 7.11 Integrating ADC (Coulomb Counter) Characteristics
    12. 7.12 Data Flash Memory Characteristics
    13. 7.13 I2C-Compatible Interface Communication Timing Characteristics
    14. 7.14 SDQ Switching Characteristics
    15. 7.15 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Data Commands
        1. 8.3.1.1 Standard Data Commands
          1. 8.3.1.1.1 Control(): 0x00/0x01
      2. 8.3.2 SDQ Signaling
      3. 8.3.3 Reset and Presence Pulse
      4. 8.3.4 WRITE
      5. 8.3.5 READ
      6. 8.3.6 Program Pulse
      7. 8.3.7 IDLE
      8. 8.3.8 CRC Generation
      9. 8.3.9 Communications
        1. 8.3.9.1 I2C Interface
        2. 8.3.9.2 I2C Time Out
        3. 8.3.9.3 I2C Command Waiting Time
        4. 8.3.9.4 I2C Clock Stretching
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 BAT Voltage Sense Input
        2. 9.2.2.2 SRP and SRN Current Sense Inputs
        3. 9.2.2.3 Sense Resistor Selection
        4. 9.2.2.4 TS Temperature Sense Input
        5. 9.2.2.5 Thermistor Selection
        6. 9.2.2.6 REGIN Power Supply Input Filtering
        7. 9.2.2.7 VCC LDO Output Filtering
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Power Supply Decoupling
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Sense Resistor Connections
      2. 11.1.2 Thermistor Connections
      3. 11.1.3 High-Current and Low-Current Path Separation
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
  14. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • YZF|15
    • MXBG070J
Thermal pad, mechanical data (Package|Pins)
Orderable Information
  • sluscg9a_oa
  • sluscg9a_pm
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  • Full reading width
    • Full reading width
    • Comfortable reading width
    • Expanded reading width
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DATA SHEET

bq27320 Single-Cell CEDV Fuel Gauge

1 Features

  • Battery Fuel Gauge For System-/Pack-Side Configuration
  • Compensated End-of-Discharge Voltage (CEDV) Gauging Technology
    • Adjusts for Battery Aging, Self-Discharge, Temperature, and Rate Changes
    • Reports Remaining Capacity, State-of-Charge (SOC), and Time-to-Empty with Smoothing Filter
    • Battery State-of-Health Estimation
    • Supports Embedded or Removable Packs from 100-mAhr to 14,500-mAhr Capacity
    • Accommodates Pack Swapping with up to Four Separate Battery Profiles
    • Supports a Raw Coulomb Counter To Provide Delta Capacity Information
  • Microcontroller Peripheral Supports:
    • SDQ Communication Interface for
      Authentication ID
    • 400-kHz I2C™ Serial Interface for High-Speed Communication
    • 32 Bytes of Scratch-Pad FLASH NVM
    • Battery Low Digital Output Warning
    • Configurable SOC Interrupts
    • External Thermistor, Internal Sensor, or Host Reported Temperature Options
  • 15-Pin 1.375 mm x 2.75 mm x 1.75 mm Pitch NanoFree™ (DSBGA) Package

2 Applications

  • Smartphones, Feature Phones, and Tablets
  • Wearables
  • Building Automation
  • Portable Medical/Industrial Handsets
  • Portable Audio
  • Gaming

3 Description

The Texas Instruments single-cell bq27320 battery fuel gauge requires very minimal configuration and system microcontroller firmware development, leading to quick system bring-up. The bq27320 uses the Compensated End-of-Discharge Voltage (CEDV) gas gauging algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), runtime-to-empty (min), battery voltage (mV), temperature (°C) and state-of-health (%).

TI customers can tune chemistry parameters using TI's web-based tool, GAUGEPARCAL.

Configurable interrupts help save system power and free up the host from continuous polling. Accurate temperature sensing is supported via an external thermistor.

Battery fuel gauging with the bq27320 requires only PACK+ (P+), PACK– (P–), and optional thermistor (T) connections to a removable battery pack or embedded battery circuit. The device uses a 15-ball NanoFree™ (DSBGA) package. It is ideal for space-constrained applications.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
bq27320 YZF (15) 1.375 mm x 2.75 mm
x 1.75 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Schematic

bq27320 bq27320_typ_app.gif

4 Revision History

DATE REVISION NOTES
March 2016 A PRODUCT PREVIEW to Production Data

5 Device Comparison Table

ORDER NUMBER PACKAGE PACKAGE QUANTITY BODY SIZE
bq27320YZFT YZF 250 1.375 mm x 2.75 mm x 1.75 mm
bq27320YZFR 3000

6 Pin Configuration and Functions



Pin Functions

PIN TYPE DESCRIPTION
NAME NUMBER
SRP A1 IA(1) Analog input pin connected to the internal coulomb counter with a Kelvin connection where SRP is nearest the PACK– connection. Connect to 5-mΩ to 20-mΩ sense resistor.
SRN B1 IA Analog input pin connected to the internal coulomb counter with a Kelvin connection where SRN is nearest the Vss connection. Connect to 5-mΩ to 20-mΩ sense resistor.
VSS C1, C2 P Device ground
VCC D1 P Regulator output and bq27320 processor power. Decouple with 1-μF ceramic capacitor to Vss.
REGIN E1 P Regulator input. Decouple with 0.1-μF ceramic capacitor to VSS.
SOC_INT A2 O SOC state interrupts output. Generates a pulse under the conditions specified by (1). Open drain output
BAT_GD B2 O Battery Good push-pull indicator output. Active-low and output disabled by default. Polarity is configured via Op Config [BATG_POL] and the output is enabled via OpConfig C [BATGSPUEN].
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. Recommend maintaining VCE ≤ VREGIN under all conditions.
BAT E2 I Cell-voltage measurement input. ADC input. Recommend 4.8V maximum for conversion accuracy.
SCL A3 I Slave I2C serial communications clock input line for communication with system (Master). Open-drain I/O. Use with 10-kΩ pull-up resistor (typical).
SDA B3 I/O Slave I2C serial communications data line for communication with system (Master). Open-drain I/O. Use with 10-kΩ pull-up resistor (typical).
SDQ C3 O Communication interface to Authentication ID IC, using the SDQ protocol
TS D3 IA Pack thermistor voltage sense (use 103AT-type thermistor). ADC input
BI/TOUT E3 I/O Battery-insertion detection input. Power pin for pack thermistor network. Thermistor-multiplexer control pin. Use with pull-up resistor >1MΩ (1.8 MΩ typical).
(1) I/O = Digital input/output, IA = Analog input, P = Power connection

7 Specifications

7.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)
MIN MAX UNIT
VREGIN Regulator input range –0.3 5.5 V
–0.3 6.0 (2) V
VCE CE input pin –0.3 VREGIN + 0.3 V
VCC Supply voltage range –0.3 2.75 V
VIOD Open-drain I/O pins (SDA, SCL, SOC_INT) –0.3 5.5 V
VBAT BAT input pin –0.3 5.5 V
–0.3 6.0 (2) V
VI Input voltage range to all other pins
(BI/TOUT, TS, SRP, SRN, SDQ, BAT_GD)		 –0.3 VCC + 0.3 V
TA Operating free-air temperature range –40 85 °C
TFUNC Functional Temperature –40 110 °C
TSTG Storage temperature range –65 150 °C
(1) Stresses beyond those listed under "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 under "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.

7.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic Discharge Human body model (HBM) ESD stress voltage(1), BAT pin 1500 V
Human-body model (HBM), all other pins 2000
Charged-device model (CDM) ESD stress voltage(1) 500 V
(1) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

7.3 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

7.4 Thermal Information

THERMAL METRIC(1) bq27320 UNIT
YZF (DSBGA)

15 PINS
RθJA Junction-to-ambient thermal resistance 70 °C/W
RθJCtop 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
RθJCbot Junction-to-case (bottom) thermal resistance n/a °C/W
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953

7.5 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
ISNOOZE(1) Sleep+ operating mode current Fuel gauge in SNOOZE 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
ISHD(1) SHUTDOWN mode current Fuel gauge in SHUTDOWN mode
CE Pin < VIL(CE) max. 		1 μA
(1) Specified by design. Not production tested.

7.6 Digital Input and Output DC 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, SDQ, BAT_GD) IOL = 3 mA 0.4 V
VOH(PP) Output voltage, high (SDQ, BAT_GD) 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 (I/O pins) 0.3 μA
(1) Specified by design. Not production tested.

7.7 Power-On Reset

TA = –40°C to 85°C, typical values at TA = 25°C and VREGIN = 3.6 V (unless otherwise noted)
PARAMETER TEST CONDITIONS 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

7.8 2.5-V LDO Regulator

TA = –40°C to 85°C, CLDO25 = 1μF, VREGIN = 3.6 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN NOM MAX UNIT
VREG25 Regulator output voltage (VCC) 2.8 V ≤ VREGIN ≤ 4.5V, IOUT ≤ 16 mA(1) 2.3 2.5 2.6 V
2.45 V ≤ VREGIN < 2.8V (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.

7.9 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 TEST CONDITIONS MIN TYP MAX UNIT
fOSC High Frequency Oscillator 8.389 MHz
fLOSC Low Frequency Oscillator 32.768 kHz

7.10 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) bq27320 not measuring cell voltage 8 MΩ
bq27320 measuring cell voltage 100 kΩ
Ilkg(ADC)(1) Input leakage current 0.3 μA
(1) Specified by design. Not tested in production.

7.11 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.

7.12 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 TEST CONDITIONS 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

7.13 I2C-Compatible Interface Communication Timing 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 NOM MAX UNIT
tr SCL/SDA rise time 300 ns
tf SCL/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. (Refer to I2C Interface and I2C Command Waiting Time)

7.14 SDQ Switching Characteristics

TA = –20°C to 70°C; VPU(min) = 2.65 VDC to 5.5 VDC, all voltages relative to VSS
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
tc Bit cycle time(1) 60 120 μs
tWSTRB Write start cycle(1) 1 15 μs
tWDSU Write data setup(1) tWSTRB 15 μs
tWDH Write data hold(1) (2) 60 tc μs
trec Recovery time(1) 1 μs
For memory command only 5
tRSTRB Read start cycle(1) 1 13 μs
tODD Output data delay(1) tRSTRB 13 μs
tODHO Output data hold(1) 17 60 μs
tRST Reset time(1) 480 μs
tPPD Presence pulse delay(1) 15 60 μs
tPP Presence pulse(1) 60 240 μs
tEPROG EPROM programming time 2500 μs
tPSU Program setup time 5 μs
tPREC Program recovery time 5 μs
tPRE Program rising-edge time 5 μs
tPFE Program falling-edge time 5 μs
tRSTREC 480 μs
(1) 5-kΩ series resistor between SDQ pin and VPU.
(2) tWDH must be less than tc to account for recovery.
bq27320 i2c_timing_diagram.gif Figure 1. I2C-Compatible Interface Timing Diagrams

7.15 Typical Characteristics

bq27320 D001_SLUSBU6.gif
Figure 2. Regulator Output Voltage vs. Temperature
bq27320 D003_SLUSBU6.gif
Figure 4. Low-Frequency Oscillator Frequency vs. Temperature
bq27320 D002_SLUSBU6.gif
Figure 3. High-Frequency Oscillator Frequency vs. Temperature
bq27320 D004_SLUSBU6.gif
Figure 5. Reported Internal Temperature Measurement vs. Temperature

 
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