This technical reference manual (TRM) discusses the modules and peripherals of the BQ76952 device, and how each is used to build a complete battery pack monitor and protection solution. For details on the hardware device features and electrical specifications, see the BQ76952 3-Series to 16-Series High Accuracy Battery Monitor and Protector for Li-Ion, Li-Polymer, and LiFePO4 Battery Packs Data Sheet (SLUSE13).
The following notation is used if commands, subcommands, and data memory values are mentioned within a text block:
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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:
The BQ76952 product is a highly integrated, accurate battery monitor and protector for 3-series to 16-series li-ion, li-polymer, and LiFePO4 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 which 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 allows 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 BQ76952 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 I2C, 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, and multifunction pins can be programmed to use for additional thermistors, supporting a total of up to 9 thermistors, in addition to an internal die temperature measurement. Figure 3-1 shows the BQ76952 block diagram.