CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
Shanghai YUGE Information Technology Co., Ltd.
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49
ANT_MAIN
IO
Main antenna
50 ohm characteristic
impedance
Main serial port
Pin
Definition
IO
Functional description
Remarks
62
RI
DO
Ring alert
1.8V voltage domain
63
DCD
DO
Module output carrier
detection
1.8V, left floating
when not in use
64
CTS
DO
Module clear send
1.8V, left floating
when not in use
65
RTS
DI
DTE request to send data
1.8V voltage domain
66
DTR
DI
DTE is ready
1.8V voltage domain
67
TXD
DO
Main serial data
transmission
1.8V voltage domain
68
RXD
DI
Main serial data reception 1.8V voltage domain
USB interface
Pin
Definition
IO
Functional description
Remarks
69
USB_D+
IO
USB bus differential
positive signal
90 ohm differential
impedance
70
USB_D-
IO
USB bus differential
negative signal
90 ohm differential
impedance
71
USB_VBUS
PI
USB insertion detection
Other functional interfaces
Pin
Definition
IO
Functional description
Remarks
115
USB_BOOT
DI
Forced download mode
control
Active high
RESERVED Pin
Pin
Definition
Description Remarks
18
，
35
，
43
，
55
，
73~84
，
113
，
114
，
116~144
RESERVED
Keep floating
The module's general IO pin level is 1.8V (except SIM, the SIM card pin level supports
