The Texas Instruments
BQ76922
device
is a highly integrated, high accuracy
battery monitor and protector for 3-series to
5-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,
a
programmable
LDO
for external system use, and a host communication peripheral
supporting 400kHz I2C
and HDQ one-wire standards.
Device
features
include:
- Battery monitoring capability for 3-series to
5-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 < 1µV (typical)
- High accuracy cell voltage measurement < 10mV
(typical)
- Wide-range current
applications (±200mV 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: 24µA to 41µA
- Multiple DEEPSLEEP
mode options: 9.2µA to 10.7µA
- SHUTDOWN mode:
<
1µA
- High-voltage tolerance of
60
V on cell connect and select additional pins
- Support for temperature sensing using internal sensor and up to
five
external thermistors
- Integrated one-time-programmable (OTP) memory programmable
by customers on production line
- Communication options include 400kHz
I2C
and HDQ one-wire interface
- Programmable
LDO
for external system usage