TS5A23157-Q1: How to use SPST

Lee, Sam

Part Number: TS5A23157-Q1
Other Parts Discussed in Thread: SN74LVC2G66-Q1

Hello team,

Is it possible to use TS5A23157-Q1 as 2ch SPST switch, to control one more slave device to the working I2C bus line(master, slave1, slave2)?

(FYI - SN74LVC2G66-Q1 can’t use because of not supporting roughed L/F.)

If it’s possible, can you let me know how to terminate the unused port at the I2C switch off?

Thanks and regards,

Sam Lee

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 283290 points

It is possible to disconnect I²C bus segments with an analog switch. No termination is necessary.

Each bus segment needs pull-up resistors to prevent the signal lines from floating. If there is no master in a segment, the resistors can be very weak (100 kΩ or so).

0 Lee, Sam over 1 year ago in reply to Clemens Ladisch

TI__Expert 5535 points

Hi Clemens,

Thank you for your reply. I'd like to double check if the following configuration is okay.

Best Regards,

Sam Lee

+1 Clemens Ladisch over 1 year ago in reply to Lee, Sam

Guru 283290 points

This will work, but the right 100 kΩ resistor is not necessary. (There is no device connected to that pin, so it does not matter whether that pin is floating.)

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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TS5A23157-Q1: How to use SPST