LPC54608 UART TX open drain or not?

実奥山 — Mon, 10 Sep 2018 08:36:02 GMT

I'd like to use the pin named P0_30-ISP_FC0_TXD(A2) as a USART transmitter.

Is this pin an open drain pin by a default mode?

If this pin is an open drain pin, I have to put pull-up resistor.

I don't want to put pull-up resistor.

Please tell me whether pull-up resistor is needed.

In the same way.
When also using D3,P12 pin as a USART transmitter, please tell me whether pull-up resistor is needed.

Re: LPC54608 UART TX open drain or not?

soledad — Mon, 10 Sep 2018 16:55:19 GMT

Hi,

This is a stardard I/O pin.The default configuration for standard I/O pins is Z mode. The weak MOS devices provide a drive capability equivalent to pull-up and pull-down resistors.

The below figure shows the possible pin modes for standard I/O pins:

• Digital output driver: enabled/disabled.

• Digital input: Pull-up enabled/disabled.

• Digital input: Pull-down enabled/disabled.

• Digital input: Repeater mode enabled/disabled.

• Z mode; High impedance (no cross-bar currents for floating inputs).

Have a great day,
Sol

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LPC54608 UART TX open drain or not?

Re: LPC54608 UART TX open drain or not?