TCA9548 VCC power up and power

Joyce Li

Other Parts Discussed in Thread: TCA9548A

Hi Dear expert,

My customer wants to check whether below application is ok or not:

if the green circle side, master side first power up and red circle 9548 may not power up, which might cause some current sink in 9548. Customer might control 9548 power up and down any time, is that ok?

thanks a lot!

BR,

Joyce

over 7 years ago

0 Clemens Ladisch over 7 years ago

Guru 244360 points

Table 6.3 (Recommended Operating Conditions) in the TCA9548A datasheet allows the SCL/SDA lines to have up to 6 V, independent of V_CC.

This is not true for the address lines (which you can connect to the powered-off V_CC, if needed), and for RESET (which must be held low when the TCA is powered off).

0 Joyce Li over 7 years ago in reply to Clemens Ladisch

TI__Intellectual 2170 points

Hi Clemens,

thanks for your explanation.

sorry for late reply.

BR,

Joyce

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TCA9548 VCC power up and power