BOOSTXL-TMP107: Buffer selection for daisy chain

Rushabh Shah52

Part Number: BOOSTXL-TMP107
Other Parts Discussed in Thread: TMP107

TMP107 datasheet recommends using tri-state buffer and 100ohm resister at Rx pin, while boostxl design uses open drain buffer. For new designs is any particular configuration recommended?

over 5 years ago

0 Ren Schackmann over 5 years ago

TI__Mastermind 45025 points

Hi Rushabh,

I prefer the open drain buffer for simplicity, but we don't have any other reason to recommend one over the other.

thanks,

ren

0 Rushabh Shah52 over 5 years ago in reply to Ren Schackmann

Intellectual 270 points

Thanks for your reply. Is 100ohm resistance recommended at Rx in open drain design? Boostxl design connects Rx directly to buffer output.

0 Ren Schackmann over 5 years ago in reply to Rushabh Shah52

TI__Mastermind 45025 points

Hi Rushabh,

The 100ohm resistor is not required. If your MCU's RX is capable of being driven as an output, this resistor could protect it from contesting with the external driver during startup/configuration of the MCU. When RX is an input, the 100ohm should not provide any additional function over what the 10ohm provides.

thanks,

ren

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BOOSTXL-TMP107: Buffer selection for daisy chain