Chengdu Ebyte Electronic Technology Co,;Ltd E32-868T20D user manual
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not used, could be grounded).
TTL UART inputs, connects to external (MCU, PC) TXD output pin. Can
be configured as open-drain or pull-up input.
TTL UART outputs, connects to external RXD (MCU, PC) input pin. Can
be configured as open-drain or push-pull output
To indicate module ’ s working status & wakes up the external MCU.
During the procedure of self-check initialization, the pin outputs low
level. Can be configured as push-pull output (suspending is allowed).
Power supply :2.3~ 5.2V DC
The UART module is TTL level.
For some MCU works at 5VDC, it may need to add 4-10K pull-up resistor for the TXD & AUX pin.