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8 Device Description
8.1 Overview
The BQ76942 product is a highly integrated, accurate battery monitor and protector for 3-series to 10-series
Li-ion, Li-polymer, and LiFePO
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battery packs. A high accuracy voltage, current, and temperature measurement
accuracy provides data for host-based algorithms and control. A feature-rich and highly configurable protection
subsystem provides a wide set of protections that can be triggered and recovered completely autonomously
by the device or under full control of a host processor. The integrated charge pump with high-side protection
NFET drivers enables host communication with the device even when FETs are off by preserving the ground
connection to the pack. Dual programmable LDOs are included for external system use, with each independently
programmable to voltages of 1.8 V, 2.5 V, 3.0 V, 3.3 V, and 5.0 V, capable of providing up to 45 mA each.
The BQ76942 device includes one-time-programmable (OTP) memory for customers to setup device operation
on their own production line. Multiple communications interfaces are supported, including 400-kHz I
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C, SPI,
and HDQ one-wire standards. Multiple digital control and status data are available through several multifunction
pins on the device, including an interrupt to the host processor, and independent controls for host override of
each high-side protection NFET. Three dedicated pins are provided for temperature measurement using external
thermistors. Additionally, multifunction pins can be programmed to use additional thermistors, with the device
supporting a total of up to nine thermistors. An internal die temperature measurement is also provided.
8.2 BQ76942 Device Versions
The BQ76942 device family includes several versions with differing default settings programmed during factory
test. These different settings, which may include having a different default communications interface or a
different setting for the REG1 LDO, are described in the
.
SLUSE14B – DECEMBER 2020 – REVISED DECEMBER 2021
Copyright © 2021 Texas Instruments Incorporated
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