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BQ76952: 引脚使用详情

Part Number:BQ76952

1.电源输入BAT/47脚,可否不接,由外围电路控制其通断?是否有什么注意事项?
2.BAT供电,初始化是什么模式?NORMAL吗?如果是其他模式,有哪些方式使其进入NORMAL模式,通讯指令?拉低RST_SHUT?拉低TS2?
3.VC0与VSS连接的问题,整体方案上,PGND会先接通,B0检测线和其他单节一起通过插座接入。
a GND/VSS也从PGND接入,那么VC0需要如何处理?已开发产品经验分享?GND/VSS与VC0先在PCB上通过0ohm连接,插线后取下0ohm,操作上有点麻烦
b GND/VSS从VC0接入,即VC0和VSS在PCB上铜箔短接,那么是否还需要VC0的RF阻容?此时乱序上电是否有问题?

4.对于这种不控放电、仅控制充电,双MOS充电的,高侧驱动应该怎么接?
5.PCHG PDSG何种情况下使用?
6.DCHG DDSG是电平信号?若启用,则高侧驱动自动被禁用?
7.PACK/42脚,具体作用是什么?在我司这种方案下,是否可以不接?串联电阻的功耗跟哪些有关、应如何计算?
8.REG1 REG2若使用,注意事项?

9.若独立全保护,即充电&放电控制、无MCU主机,BQ76952在充电和放电的唤醒逻辑是什么?

Star Xu:

您好

1, BAT 推荐使用推荐的电路。您可以参考下面帖子的内容

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/934744/bq76952-disconnecting-bat-power-input

2,初始化就是正常模式

3,VC0与VSS电路建议参考评估板的电路.

4, 是单独控制充放电MOS,你可以参考

 Multiple FETs with the BQ76952, BQ76942 Battery Monitors (Rev. A). 
This video also briefly covers reverse charging configuration and shows more schematic development information: Creating the Schematic for BQ769x2 Battery Monitors – YouTube.

5,PCHG PDSG请参考下面帖子的内容

https://www.ti2k.com/wp-content/uploads/ti2k/DeyiSupport_电源管理_faq-bq76952-what-is-the-default-output-of-pdsg-pchg-when-pre-discharge-and-pre-charge-is-enabled

6,DCHG and DDSG请参考下面帖子内容

https://www.ti2k.com/wp-content/uploads/ti2k/DeyiSupport_电源管理_bq76952-bms-with-bq76952-functionality-of-dchg-ddsg-in-the-afe

7,PACK pin should be connected to BAT+ with a 10k pull-up resistor.

8,Using the REG1/REG2 regulators is not required. Many users use these to power the MCU or other electronics in the system. 

If you are not using BREG, REGIN, REG1, REG2, see Table 16-3 in the datasheet for instructions on how to connect these pins. All four pins can be tied to VSS if unused.

9,BQ76952 can operate standalone, but this requires programming the desired settings into OTP. This thread has some helpful guidance on OTP programming in addition to the information in the TRM: https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1082914/faq-bq76952-common-questions-for-otp-programming-with-the-bq769x2-device-family

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