CLM920 TD3 LTE Module Hardware Usage Guide
Shanghai Yuge Information Technology co., LTD
- 21 -
8,9,10,19,22,36,46,48,
50,51,52,53,54,56,72
GND
Ground
85~112
GND
Heat sink pad
Module switch machine and reset
Pin
Pin definition
IO
Functional description
Remarks
21
PWRKEY
DI
Switching module pin
Active low
20
RESET
DI
Module reset pin
Low level reset module
USB interface
Pin
Pin definition
IO
Functional description
Remarks
71
USB_VBUS
PI
USB detection
69
USB_D+
IO
USB bus differential positive signal 90
Ω
differential
impedance
70
USB_D-
IO
USB bus differential negative signal 90
Ω
differential
impedance
UART interface (main serial port)
Pin Pin definition
IO
Functional description
Remarks
62
RI
DO
Ringing prompt
Wake up the host,
please keep it floating
when not in use
63
DCD
DO
Carrier detection
please keep it floating
when not in use
64
CTS
DO
Clear send
please keep it floating
when not in use
65
RTS
DI
Request to send
please keep it floating
when not in use
66
DTR
DI
Module sleep mode control
please keep it floating
when not in use
67
TXD
DO
Serial data transmission
please keep it floating
when not in use
68
RXD
DI
Serial data reception
please keep it floating