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Chengdu Ebyte Electronic Technology Co., Ltd.
13
GND
14
GND
15
GND
16
GND
19
GND
20
M0
21
M1
22
RXD
23
TXD
24
AUX
25
VCC
26
GND
4. Recommended Connection Diagram
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impedance)
-
Module ground wire
-
Module ground wire
-
Module ground wire
-
Module ground wire
-
Module ground wire
Input (very weak
Work with M1 to decide 4 working modes of the module (cannot be left
pull-up)
floating; can be grounded if not used).
Input (very weak
Work with M0 to decide 4 working modes of the module (cannot be left
pull-up)
floating; can be grounded if not used).
Input
TTL serial port input, connected to the external TXD output pin;
Output
TTL serial port output , connected to the external RXD input pin;
Used to indicate the working status of the module;
Output
For user to wakes up the external MCU and it outputs low level during
power-on self-check initialization; (can be left floating)
-
Module power supply positive reference, voltage range: 2.7 ~ 5.5VDC
-
Module ground wire
E22-xxxT22S series product user manual
9
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