BQ76952: 完成上电后器件自动离开shutdown模式进入normal模式

Jay Wang_China

Part Number: BQ76952

在实际测试中发现，AFE完成上电后在未对TS2执行任何操作，就已经可以在REG18测量到1.8V的电压。

查看TRM shutdown进入normal模式的条件有两个，一个是检测到TS2的下拉动作，一个是有charger dection；在后续的测试中将TS2处于浮空状态、PACK关键也处于浮空状态，LD脚接入BAT-，依然存在上电后可以测量到REG18的1.8V输出

然后我们使用BQ76952的EVM板进行了同样的测试，接入50V电源在CELL16与BAT-管脚，TS2处跳线帽不做任何连接，上电后再未按下wake开关的时候，则可以在REG18处测量到1.8V电压

2 年多前

0 Star Xu 2 年多前

TI__Guru*** 130456 points

您好，REG18输出1.8V是芯片设置的固定输出。

The BQ76952 device contains an integrated 1.8-V LDO (REG18) that provides a regulated 1.8 V supply voltage for the device's internal circuitry and digital logic. This regulator uses an external capacitor connected to the REG18 pin, and it should only be used for internal circuitry.

0 Jay Wang_China 2 年多前回复 Star Xu

Prodigy 60 points

你好，这个问题不是在于REG18输出1.8V，而是BQ上电后再未明确给入激活信号的情况下，则自行进入了Normal模式。因为当前我们是将REG18有输出作为BQ离开shutdown开始工作的判断。

0 Star Xu 2 年多前回复 Jay Wang_China

TI__Guru*** 130456 points

您好，建议将REG1，或者REG2有输出作为BQ离开shutdown开始工作的判断。数据手册13.1有介绍shutdown mode

SHUTDOWN mode: The device is completely disabled (including the internal, REG1, and REG2 LDOs), the CHG, PCHG, DSG, and PDSG FETs are all disabled, all battery protections are disabled, and no measurements are taken. This is the lowest power state of the device, which may be used for shipment or long-term storage. All register settings are lost when in SHUTDOWN mode.

0 Jay Wang_China 2 年多前回复 Star Xu

Prodigy 60 points

如果你这边是TI支持团队，请停止这样答非所问的回复。如果是机器回复，也请停止这类的无效沟通

0 Star Xu 2 年多前回复 Jay Wang_China

TI__Guru*** 130456 points

您好，请参考下面内容：

the BQ76952 will be in Normal mode after power is connected. It will only enter Shutdown if the Shutdown command is sent by the host or the RST_SHUT pin is held high for more than 1 second.