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BQ76952: REG1,REG2

Jonas Zhang
Intellectual 400 points
Part Number: BQ76952

1 电流

1.1 CC1每250ms上报一次，若没有标志位，还有其他方法能保证MCU能及时读取到最新的CC1吗？

1.2 CC3作为80（缺省值）个CC2的平均值，是每3ms（缺省值）更新一次，还是每240ms更新一次？可以通过ADSCAN标志位来判断CC3是否更新了吗？

 

​2 REG1和REG2

由于REG1和REG2上电时默认是没有输出的，我们想要其上电是有输出，需要进行OTP操作，但在此之前需要REG1和REG2有输出，保证对MCU的供电，

在参考手册中提到了使用 “外部电压电源过度驱动REG1电压”，请问这个过度驱动该如何操作？

 

  • 0
    TI__Guru*** 130456 points

    您好

    1，请参考下面链接的内容对您有帮助

    https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1270904/bq76952-bq76952-stm32-current-read?tisearch=e2e-sitesearch&keymatch=BQ76952%252520CC1%252520read#

    2，The CC3 output is reported in 16-bit format using the 0x0075 DASTATUS5() subcommand. 详细请参考TRM 4.3 Coulomb Counter and Digital Filters

    3, 

    Jonas Zhang 说：
    这个过度驱动该如何操作

    没有找到相关资料介绍，正在询问更了解这款芯片的TI工程师，稍后回复。

  • 0 回复 Star Xu
    TI__Guru*** 130456 points

    您好，过度驱动请参考下面介绍：

    You will most likely use the REG1 LDO output to pull-up the i2c communication lines through pull-up resistors, so they will build a PCB that pulls the i2c lines up to REG1.  The issue with this, though, is that some devices are not configured with REG1 ON by default, but in order to communicate with the BQ76952 through i2c, the lines must be pulled up to a higher voltage.

    So to communicate with the BQ76952, the customer needs to enable the REG1 LDO, but the customer cannot change the REG1 LDO configuration without having a pull-up voltage present on the i2c lines, which is provided by REG1.  This is a tricky situation, and it is why we recommend overdriving.

    What this entails is having an external voltage source connect to where the REG1 pin is pulling up the i2c lines and provide the voltage needed for the MCU to communicate with the BQ76952 and enable the REG1 LDO through programming it into OTP.  Once REG1 is enabled in OTP, the external voltage source is not needed.