Zhejiang Lierda Internet of Things technology Co. Ltd LSD4WN2L917M90 ユーザーズマニュアル

22

GPIO description, as shown in Table 5-8:

Table 5-8 Extended GPIO

inter

face

pin

defi

niti

on

I/O

Describetion

Remark

GPIO

11

P0

Output

Control the output high or low by the AT + GPIO

instruction

GPIO

3

P1

Output

Control the output high or low by the AT + GPIO

instruction

GPIO

4

P2

Output

Control the output high or low by the AT + GPIO

instruction

GPIO

5

P3

Output

Control the output high or low by the AT + GPIO

instruction

5.3 Typical application circuit

User interface: serial port, GPIO, power and so on

Antenna interface: 50Ω stamp hole output

Table 5-1 LSD4WN-2L917M90 Typical application circuit

instruction：

1：Bold Trace is required for the system connection (recommended).

2 ： The green trace of the antenna exit (ANT <-> PIN22) requires 50 Ω