Ebyte E34-2G4D20D, Руководство пользователя

Страница: 6 / 16

Chengdu Ebyte Electronic Technology Co., Ltd. E34-2G4D20D User manual
Copyright ©2012–2018, Chengdu Ebyte Electronic Technology Co.,Ltd.
4
No. Name Direction Function
1 M0
Input
（ weak pull-up ）
Work with M1 & decide the four operating modes.
Floating is not allowed, can be ground.
2 M1
Input
（ weak pull-up ）
Work with M0 & decide the four operating modes.
Floating is not allowed, can be ground.
3 RXD Input
TTL UART inputs, connects to external (MCU, PC) TXD output pin. Can be
configured as open-drain or pull-up input.
4 TXD Output
TTL UART outputs, connects to external RXD (MCU, PC) input pin. Can be
configured as open-drain or push-pull output
5 AUX 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 open-drain output or push-pull output (floating is allowed).
6 VCC Power supply 2.3V~5.5V DC
7 GND Input Ground
8 Fixing hole Input Fixing hole
9 Fixing hole Fixing hole
10 Fixing hole Fixing hole
4. Recommended wiring diagram
No.
Description （ STM8L MCU ）
1 The UART module is TTL level, please connect with the MCU of TTL level.
2 For some MCU works at 5VDC, it may need to add 4~10K pull-up resistor for the TXD & AUX pin.