Ebyte E34-2G4D20D User Manual

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Ebyte E34-2G4D20D User Manual Manual pdf 6 page image

Chengdu Ebyte Electronic Technology Co., Ltd. E34-2G4D20D User manualCopyright ©2012–2018, Chengdu Ebyte Electronic Technology Co.,Ltd. 4No. Name Direction Function1 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 beconfigured as open-drain or pull-up input.4 TXD Output TTL UART outputs, connects to external RXD (MCU, PC) input pin. Can beconfigured as open-drain or push-pull output5 AUX OutputTo indicate module’s working status & wakes up the external MCU. During theprocedure of self-check initialization, the pin outputs low level. Can be configuredas open-drain output or push-pull output (floating is allowed).6 VCC Power supply 2.3V~5.5V DC7 GND Input Ground8 Fixing hole Input Fixing hole9 Fixing hole Fixing hole10 Fixing hole Fixing hole4. Recommended wiring diagramNo. 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.