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