TPS1H100-Q1: IN pin; DIAG_EN pin recommended resistor value

Billyjoe Pecson

Part Number: TPS1H100-Q1

Hello,

Is there a recommended resistor value between 3.3V MCU and EN pin?

what is the threshold?

In case the design is diagnostic always enabled, DIAG_EN pulled to 3.3V, is there a recommended value for pull-up resistor?

what is the threshold?

Thank you and best regards,

Billy

over 5 years ago

0 Cameron Phillips over 5 years ago

TI__Genius 12410 points

Hello,

The data sheet says in section 7.3.4.10 a 4.7kohm resistor is recommended.

You can pull up the pin if you want it always on. However you need to have it small enough that most of the voltage is dropped across the internal pull down.

0 Billyjoe Pecson over 5 years ago in reply to Cameron Phillips

Prodigy 160 points

Hello Cameron,

Thank you very much for your reply.

It helps me a lot.

I have an additional question.

1. will the device still works if in case IN pin to 3.3V MCU resistor is 15.0 K ohm resistor?

2. will the device still works if in case DIAG_EN pin is pulled to 3.3V supply with 36.0K ohm resistor?

2. will the device still works if in case DIAG_EN pin is pulled to 3.3V supply with 12.0K ohm resistor?

Thank you and best regards,

Billy

0 Cameron Phillips over 5 years ago in reply to Billyjoe Pecson

TI__Genius 12410 points

Billy,

I apologize for the delay.

You can see in the logic input electrical characterization that the VIH voltage is 2V with the internal pull down of 150k for the DIAGEN and 500k for the IN. Therefore your worst case voltage will be 2.66V so the device should be on and work.

0 Billyjoe Pecson over 5 years ago in reply to Cameron Phillips

Prodigy 160 points

Hello Cameron,

Thank you very much!

I appreciate your reply.

Best regards,

Billy

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TPS1H100-Q1: IN pin; DIAG_EN pin recommended resistor value