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TCA9517-Q1: I2C BUS卡死

Part Number: TCA9517-Q1

hi TI expert

我们使用类似下图得结构,设计MCU 3.3V,通过LEVELSHIFT 转化为1.8V得电平。偶发MCU I2C 卡死得情况,卡死时测试BUS-B得SCL为高电平3.3V,SDA为低电平0.5V; BUS-A 得 SCL 为高电平1.8V,SDA为低电平约0V。

(1)请问这有什么情况可能导致这种场景?

(2)我们尝试把VCCA的供电,重新拉低拉高,但总线仍然卡死,请问VCCA断电后,BUS-B的SDA仍然能输出低电平0.5V吗?

谢谢