原标题：TI BQ76952高精度多达16个电池监视和保护解决方案

　　TI公司的BQ76952是高精度电池监视器和保护器,用于3个到16个锂电池(Li-Ion),锂聚合电池(Li-Polymer)和磷酸铁锂(LiFePO4)电池组.器件包括高精度监视系统,高度配置保护子系统,支持自主或主控制的电池平衡.器件集成了高边充电泵NFET器件,用于外接系统的双可编程LDO,支持400-kHz I2C, SPI和HDQ一线标准的主通信外设.多种降功耗模式:正常模式为250 μA,多个SLEEP模式选择:20 μA到 60 μA,多个深度DEEPSLEEP选择:10 μA到14 μA以及关断SHUTDOWN模式小于2 μA.48引脚TQFP封装.主要用在电池备份单元(BBU),电动自行车,智能踏板车和LEV,无绳电动工具和花园工具,非军用无人机和其它工业电池组(>=10S).本文介绍了BQ76952主要特性,功能框图,多种应用电路以及评估模块BQ76952EVM主要特性,电路图,材料清单和PCB设计图.

　　The Texas Instruments BQ76952 is a highlyintegrated, high accuracy battery monitor and protector for 3-series to 16-series Li-Ion, Li-Polymer,and LiFePO4 battery packs. The device includes ahigh accuracy monitoring system, a highlyconfigurable protection subsystem, and support forautonomous or host controlled cell balancing.

　　Integration includes high-side charge-pump NFETdrivers, dual programmable LDOs for external systemuse, and a host communication peripheral supporting400-kHz I2C, SPI, and HDQ one-wire standards. TheBQ76952 is available in a 48-pin TQFP package.

　　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 measurementaccuracy provides data for host-based algorithms and control. A feature-rich and highly configurable protectionsubsystem provides a wide set of protections which can be triggered and recovered completely autonomously bythe device or under full control of a host processor. The integrated charge pump with high-side protection NFETdrivers allows host communication with the device even when FETs are off by preserving the ground connectionto the pack. Dual programmable LDOs are included for external system use, with each independentlyprogrammable to voltages of 1.8 V, 2.5 V, 3.0 V, 3.3 V, and 5.0 V, capable of providing up to 50 mA each.

　　The BQ76952 device includes one-time-programmable (OTP) memory for customers to setup device operationon their own production line. Multiple communications interfaces are supported, including 400-kHz I2C, SPI, andHDQ one-wire standards. Multiple digital control and status data are available through several multifunction pinson the device, including an interrupt to the host processor, and independent controls for host override of eachhigh-side protection NFET. Three dedicated pins are provided for temperature measurement using externalthermistors, and multifunction pins can be programmed to use for additional thermistors, supporting a total of upto 9 thermistors, in addition to an internal die temperature measurement. The following sections detail the majorcomponent blocks of the BQ76952 device.

　　BQ76952主要特性:

　　1• Battery monitoring capability for 3-series to 16-series cells

　　• Integrated charge pump for high-side NFETprotection with optional autonomous recovery

　　• Extensive protection suite including voltage,temperature, current, and internal diagnostics

　　• Two independent ADCs

　　– Support for simultaneous current and voltagesampling

　　– High-accuracy coulomb counter with inputoffset error < 1 μV (typical)

　　– High accuracy cell voltage measurement < 10mV (typical)

　　• Wide-range current applications (±200-mVmeasurement range across sense resistor)

　　• Integrated secondary chemical fuse driveprotection

　　• Autonomous or host-controlled cell balancing

　　• Multiple power modes (typical battery packoperating range conditions)

　　– NORMAL mode: 250 μA

　　– Multiple SLEEP mode options: 20 μA to 60 μA

　　– Multiple DEEPSLEEP mode options: 10 μA to14 μA

　　– SHUTDOWN Mode: < 2 μA

　　• High voltage tolerance of 85 V on cell connect andselect additional pins

　　• Support for temperature sensing using internalsensor and up to 9 external thermistors

　　• Integrated one-time-programmable (OTP) memoryprogrammable by customers on production line

　　• Communication options include 400-kHz I2C, SPI,and HDQ one-wire interface

　　• Dual programmable LDOs for external systemusage

　　• 48-pin TQFP package (PFB)

　　BQ76952应用:

　　• Battery backup unit (BBU)

　　• E-bike, e-scooter, and LEV

　　• Cordless power tools and garden tools

　　• Non-military drones

　　• Other industrial battery pack (>=10S)

　　图.BQ76952简化电路图

　　图.BQ76952功能框图

　　图.BQ76952 16个串行电池简化电路图

　　评估模块BQ76952EVM

　　The BQ76952EVM evaluation module (EVM) is a complete evaluation system for the BQ76952, a 3-cell to16-cell Li-Ion battery monitor integrated circuit. The EVM consists of a BQ76952 circuit module which isused for simple evaluation of the BQ76952 monitor function. The circuit module includes one BQ76952integrated circuit (IC), sense resistor, power FETs, and all other onboard components necessary to protectthe cells from overcharge, over discharge, short circuit, and overcurrent discharge in a 16-series cell Li-Ionor Li-Polymer battery pack. The circuit module connects directly across the cells in a battery, or can beconnected with a power supply and the included cell simulator resistors. With the on-board interface orcompatible external interface board and Microsoft® Windows® based PC graphical user interface (GUI)software, the user can view the device registers, adjust protection limits and enable FET control outputs.

　　评估模块BQ76952EVM主要特性:

　　• Complete evaluation system for the BQ76952 3-cell to 16-cell Li-Ion and Phosphate battery monitor

　　• Populated circuit module for 16-cell configuration for quick setup

　　• Power connections available on test points

　　• Communication available with included USB interface adapter or available on 4-pin connector

　　• Resistor cell simulator for quick setup with only a power supply

　　• PC software available for configuration

　　评估模块BQ76952EVM包括:

　　• BQ76952 circuit module

　　• USB cable

　　图.评估模块BQ76952EVM基本连接图

　　图.评估模块BQ76952EVM和外接EV2400连接图