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2
M1
3
RXD
4
TXD
5
AUX
6
VCC
7
GND
8
Fixed orifice
9
Fixed orifice
10
Fixed orifice
3. Connect to MCU
No.
1
The UART module is TTL level.
2
For some MCU works at 5VDC, it may need to add 4-10K pull-up resistor for the TXD & AUX pin.
Input
Work with M0 to decide 4 working modes of module (not suspended, if
not used, could be grounded).
（weak pull-up）
TTL UART inputs, connects to external (MCU, PC) TXD output pin. Can
Input
be configured as open-drain or pull-up input.
Output
TTL UART outputs, connects to external RXD (MCU, PC) input pin. Can
be configured as open-drain or push-pull output
To indicate module ' s working status & wakes up the external MCU.
During the procedure of self-check initialization, the pin outputs low
Output
level. Can be configured as push-pull output (suspending is allowed).
Input
Power supply ：2.3~ 5.2V DC
Input
Ground
-
Fixed orifice
-
Fixed orifice
-
Fixed orifice
Description（STM8L MCU）
-3-
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