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TCA6408A: Condition for VCCP ON/OFF

Satoshi
Guru 19675 points

Part Number: TCA6408A

One customer use TCA6408A for VCCI: 3.3V and VCCP: 1.8V.

VCCI is keep 3.3V and VCCP is set 1.8V or 0V (ON or OFF) due to system condition.

Please let me know about three points below;

①Is VCCP: ON/OFF control no problem?

　(Is I2C not occur bad effect?)

②When VCCP set to 0V, are P0~P7 (I/O port) become high impedance?

③When VCCP set to 0V, is register become reset correct?

Best regards,

Satoshi

  • 0
    TI__Guru* 78201 points

    Hey Satoshi-san,

    "①Is VCCP: ON/OFF control no problem?

    　(Is I2C not occur bad effect?)"

    This should be fine. I am not sure if the I2C communication would work though. (Will check)

    "②When VCCP set to 0V, are P0~P7 (I/O port) become high impedance?"

    -Yes.

    "③When VCCP set to 0V, is register become reset correct?"

    This is something I am also unsure about at the moment. I will have to test.

    Let me get back to you Monday~Tuesday

    -Bobby

  • 0 in reply to BOBBY
    Guru 19675 points
    Bobby-san

    Thank you for reply,
    I looking forward your update.

    Best regards,
    Satoshi
  • 0 in reply to Satoshi
    TI__Guru* 78201 points
    Hey Satoshi,

    ""①Is VCCP: ON/OFF control no problem?"
    If VccP is off, the device will go into reset mode until VccP is back on. You can have VccI powered and turn on and off VccP, the device won't get damaged by this but the I2C interface will not respond if you try to talk to the device while VccP is off.


    ""③When VCCP set to 0V, is register become reset correct?""
    Yes, if you bring VccP to GND and bring it back to Vcc, the device will reset (registers too).

    Thanks,
    -Bobby