The Texas Instruments
BQ76952 is a highly integrated, high accuracy battery monitor and
protector for 3-series to 16-series li-ion, li-polymer, and
LiFePO4 battery packs. The device includes a high
accuracy monitoring system, a highly configurable protection
subsystem, and support for autonomous or host controlled cell
balancing. Integration includes high-side charge-pump NFET drivers,
dual programmable LDOs for external system use, and a host
communication peripheral supporting 400-kHz I2C, SPI, and
HDQ one-wire standards. Device features include:
- Battery
monitoring capability for 3-series to 16-series cells
- Integrated charge
pump for high-side NFET protection with optional autonomous
recovery
- Extensive protection suite including voltage,
temperature, current, and internal diagnostics
- Two independent
ADCs
- Support for simultaneous current and voltage
sampling
- High-accuracy coulomb counter with input offset
error < 1 µV (typical)
- High accuracy cell voltage
measurement < 10 mV (typical)
- Wide-range
current applications (±200-mV measurement range across sense
resistor)
- Integrated secondary chemical fuse drive
protection
- Autonomous or host-controlled cell
balancing
- Multiple power
modes (typical battery pack operating range conditions)
- NORMAL mode: 286 µA
- Multiple SLEEP mode options: 24 µA to 41 µA
- Multiple DEEPSLEEP mode options: 9.2 µA to 10.7
µA
- SHUTDOWN Mode: 1 µA
- High voltage tolerance of 85 V on cell connect
and select additional pins
- Support for temperature sensing using internal
sensor and up to 9 external thermistors
- Integrated one-time-programmable (OTP) memory
programmable by customers on production line
- Communication options include 400-kHz
I2C, SPI, and HDQ one-wire interface
- Dual programmable
LDOs for external system usage