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Chengdu Ebyte Electronic Technology Co.,Ltd.
1
M0
2
M1
3
RXD
4
TXD
5
AUX
6
VCC
7
GND
Fixed
8
hole
Fixed
9
hole
Fixed
10
hole
Chapter 4 Recommended Wiring Diagram
A brief description of the connection between the module and the microcontroller (the above picture
序号
1
The wireless serial port module is TTL level, please connect with TTL level MCU.
For some 5V microcontrollers, it may be necessary to add 4 to 10K pull-up resistors to the TXD
2
and AUX pins of the module.
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7
Input (very
Cooperate with M1 to determine the 4 working modes of the module
weak pull-up)
(can not be suspended, if not used, it can be grounded)
Input (very
Cooperate with M0 to determine the 4 working modes of the module
weak pull-up)
(can not be suspended, if not used, it can be grounded)
Input
TTL serial port input, connected to the external TXD output pin;
Output
TTL serial output, connected to external RXD input pin;
Used to indicate the working state of the module; the user wakes
Output
up the external MCU, and outputs a low level during the power-on
self-test initialization; (can be left floating）
Module power supply positive reference, voltage range: 3.0 to 5.5V
Input
DC
Input
Module Ground
-
Fixed hole
-
Fixed hole
-
Fixed hole
takes the STM8L microcontroller as an example)
E22-230T22D User Manual
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