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TCA9617A: VCCB leakage

Roy Hsu
Genius 9350 points
Part Number: TCA9617A


Hi Team,

1. My customer sees 0.4 V leakage at VCCB when they switch VCCB off. It seems that the leakage comes from SDAA or SCLA from the highlighted description below, do you agree? And is there a way to solve this issue except switching to the B version? 

(In my customer's system, VCCA is a power rail which is always on while VCCB is the standby power which can be on and off from time-to-time)

I will send you the schematic via emai

2. Would you recommend to connect the I2C host at the B side since VCCB needs to be powered up before VCCA? Since the device side might not be used all the time?

Thanks!

Roy Hsu

  • 0
    TI__Guru 62920 points

    Hi Roy,

    Today is a holiday in the US, but we will look into this more closely once we are back at work tomorrow.

    Regards,

    Max

  • 0
    TI__Guru* 77381 points

    Hey Roy,

    The simplest answer is to switch to B version of the device to get a powered off high impedance state though if that is not an option,

    You should try to power up VccB before VccA to prevent leakage current. #2 from your post seems to be the correct way to approach the problem if you can't switch to the B version.

    You can send me a schematic at duynguyen@ti.com

    Thanks,

    -Bobby