Pin Definition; Recommended Circuit Diagram - Ebyte E30-TTL-100 User Manual

SI4438 Wireless Module

3.2.2 Pin Definition

Pin No. Pin item
1 M0
2 M1
3 RXD
4 TXD
5 AUX
6 VCC
7 GND
8 ANT
9 GND
10 GND
11 GND

4. Recommended Circuit Diagram

No.
1 The UART module is TTL level. Please connect to MCU of TTL level.
2 For some MCU working at 5VDC, it may need to add 4-10K pull-up resistor for the TXD & AUX pin.
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Pin direction
Input Work with M1 & decide the four operating modes.
（weak pull-up） (Floating is not allowed, can be ground)
Input Work with M0 & decide the four operating modes.
（weak pull-up） (Floating is not allowed, can be ground)
TTL UART inputs, connects to external (MCU, PC) TXD output pin. Can be
Input
configured as open-drain or pull-up input.
TTL UART outputs, connects to external RXD (MCU, PC) input pin. Can be
Output
configured as open-drain or push-pull output
To indicate module's working status & wakes up the external MCU. During the
Output procedure of self-check initialization, the pin outputs low level. Can be configured
as open-drain output or push-pull output.
Input Power supply 2.3V~5.5V DC
Ground
Input
Output Antenna interface（ high frequency signal output）
Output Reference places of high frequency signal output
Ground
Input
Ground
Input
Description（STM8L MCU）
User Manual of E30 Series Modules
Pin application
(Floating is allowed)
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