Chengdu Ebyte Electronic Technology Co.,Ltd.
E330-400T13S User Manual
Copyright ©2012–2021
，
Chengdu Ebyte Electronic Technology Co.,Ltd.
6
3. Mechanical properties
No.
Name
Direction
Function
1
GND
-
Module ground
2
GND
-
Module ground
3
GND
-
Module ground
4
GND
-
Module ground
5
M0
Input (very weak
pull-up)
Cooperate with M1 to determine the 4 working modes of the module.
(Can not be suspended, if not used, it can be grounded)
6
M1
Input (very weak
pull-up)
Cooperate with M0 to determine the 4 working modes of the module.
(Can not be suspended, if not used, it can be grounded)
7
RXD
Input
TTL serial port input, connected to the external TXD output pin;
8
TXD
Output
TTL serial port output, connected to the external RXD input pin;
9
AUX
Output
Used to indicate the working status of the module; the user wakes up the
external MCU, and outputs low level during power-on self-check
initialization; (can be left floating)
10
VCC
-
Module power supply positive reference, voltage range: 3~3.6V DC
11
GND
-
Module ground
12
NC
Reserved
（
OCDSCK
）
13
GND
-
Module ground (GND)