2
MODULE INTERFACES
Pin number
Symbol
I/O type
Function
1
VCC
P
The internal level
conversion circuit
supplies power to
the input pin and
the actual voltage
is the voltage
uploaded by the
user’s backplane
2
TX/PB1
I/O
User-side serial
interface TXD
signal
3
RX/PB2
I/O
User-side serial
interface RXD
signal
4
3V3
P
Power supply pin
(3.3V)
5
GND
P
Power supply
reference ground
6
PA12
I/O
Support hardware
PWM function and
correspond to PA
12 of IC
7
PA13
I/O
Support hardware
PWM function and
correspond to PA
13 of IC
8
LOGTX
I/O
LOG serial
interface output
pin (used to
display the
internal
information of the
module)
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