YUGE CLM920 NC3, Hardware Manual, Page: 21 / 80

CLM920_NC3_LTE Module hardware manual
Shanghai Yuge Information Technology co., LTD - 21 -
60 VBAT PI Module power input
7 VDD_EXT PO 1.8V output Can provide pull-up for
external GPIO
(maximum 50MA),
please keep left
floating
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 machine pin Active low
20 RESET DI Module reset pin Active low
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 empty when not in use
63 DCD DO Carrier detection Keep empty when not in use
64 CTS DI Clear send Keep empty when not in use
65 RTS DO Request to send Keep empty when not in use
66 DTR DI Module sleep mode control Keep empty when not in use
67 TXD DO Serial data transmission Keep empty when not in use