The Texas Instruments BQ76907 provides a highly
integrated, high accuracy battery monitor and protector for 2-series to 7-series Li-Ion,
Li-Polymer, LiFePO4 (LFP), and LTO battery packs. Each device includes a high
accuracy monitoring system, a highly configurable protection subsystem, and support for
host controlled cell balancing. Integration includes low-side protection NFET drivers, a
programmable LDO for external system use, and an I2C host communication
interface supporting up to 400-kHz operation with optional CRC. Device features
include:
- Battery monitoring capability for 2-series to
7-series cells
- Integrated low-side drivers for NFET protection
with optional autonomous recovery
- Extensive
protection suite including voltage,temperature,
current, and internal diagnostics
- 16-bit
delta-sigma voltage ADC
- High accuracy cell voltage measurement of 4 mV
(typical)
- Dedicated
16 / 24-bit delta-sigma coulomb counter ADC
- High-accuracy current measurement with low input
offset error
- Wide-range current applications (±200 mV
measurement range across sense resistor)
- 48-bit accumulated charge integrator with
timer
- Host-controlled cell balancing
- Multiple
power modes (typical battery pack operating range
conditions)
- NORMAL mode: 32 μA to 175 μA
- SLEEP mode: 6 μA
- DEEPSLEEP mode: 2.7 μA
- SHUTDOWN Mode: < 1 μA
- High
voltage tolerance of 45 V on cell connect and select
additional pins
- Support
for temperature sensing using internal sensor and
external thermistor
- Integrated one-time-programmable (OTP) memory for
device settings, programmed by TI
- 400-kHz
I2C serial communications with optional
CRC support
- Programmable LDO for external system usage