XTR300: Connecting EFot to OD with 2.2K pull-up - unable to pull low

Brett Utesch

Part Number: XTR300

Per the datasheet (page 22, driver output disable) I have connected OD (output disable) to EFot (error flag over temperature) and used a 2.2K pull-up resistor. However, in doing this, I'm unable to pull XTR300_OD low with a microcontroller pin (only pulls down to 0.9V). Did I misunderstand page 22?

over 8 years ago

0 Zak Kaye over 8 years ago

TI__Mastermind 23050 points

Hi Brett,

The output disable pin is internally pulled high with a 1uA source. The 2.2kOhm resistor is intended to be connected between the OD and EFot pins, not as a pullup to an external rail.

0 Brett Utesch over 8 years ago in reply to Zak Kaye

Prodigy 20 points

Thanks Zak. That answered my question and fix my problem.

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XTR300: Connecting EFot to OD with 2.2K pull-up - unable to pull low