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
- SDQ Communication Interface for
- 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 |
- For all available packages, see the orderable addendum at the end of the data sheet.
Simplified Schematic
4 Revision History
| DATE | REVISION | NOTES |
|---|---|---|
| March 2016 | A | PRODUCT PREVIEW to Production Data |
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). |
