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Chengdu Ebyte Electronic Technology Co.,Ltd.
3 Mechanical Dimensions and Pin Definitions
Pins
Pins
Serial
Name
number
1
M0
2
M1
3
RXD
4
TXD
5
AUX
6
VCC
7
GND
Fixing
8
hole
Fixing
9
hole
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
Figure 3-1 Mechanical dimensions and pin definition
Table 3-1 Pin definition table
Pin Orientation
Input (very weak
Work with M1 to determine the 4 modes of operation of the module (not
pull-up)
suspended, can be grounded if not in use)
Input (very weak
Work with M0 to determine the 4 modes of operation of the module (not
pull-up)
suspended, grounded if not in use)
Input
TTL serial input, connected to the external TXD output pin.
Output
TTL serial output, connected to the external RXD input pin.
Used to indicate the working status of the module; user wakes up the external
Output
MCU and outputs low during power-on self-test initialization; (can be
suspended)
Input
Module power supply positive reference, voltage range: 3.0 to 5.5V DC
Input
Module Ground
-
Fixing hole
-
Fixing hole
E22-230T30D User Manual
Pin Usage
7
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