TPS566231: Required Pull-up resister on EN pin connected with MCU open-drain pin.

Motoyasu Hattori

Part Number: TPS566231

Hi,

According to the datasheet P.14, "The EN pin is pulled high internally." My customer controls ENABLE on EN pin by MCU's open_drain pin. When connecting ENALE pin with MCU's open_drain pin, what value of pull-up resister is required? Please let us know,

Thanks and best regards,
M.HATTORI.

over 2 years ago

0 Andrew Xiong over 2 years ago

TI__Expert 4630 points

Hi Motoyasu,

I'm sorry that I didn't understand the question very clearly. Since the EN pin is already internally pulled high, if MCU open_drain FET is at high impedance state, the EN will be internally pulled up and IC works. If MCU open drain FET is close and pull EN to GND, then IC will be disable.

I don't know if I understood your question correctly. If there's any error please point it out.

Thanks,

Andrew

0 Motoyasu Hattori over 2 years ago in reply to Andrew Xiong

TI__Expert 8695 points

Andrew-san,

Could you please let us know the internal pull-up resister value on EN pin? For example, xx_ohm?

My customer wants to know this internal resister value to decide external pull-up resister value.

Thanks and best regards,
M.HATTORI.

0 Andrew Xiong over 2 years ago in reply to Motoyasu Hattori

TI__Expert 4630 points

Hi Motoyasu-san,

The internal pull-up resistor value is about 2Mohm.

Thanks,

Andrew

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TPS566231: Required Pull-up resister on EN pin connected with MCU open-drain pin.