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CLM920_NC3_LTE Module hardware manual
Shanghai Yuge Information Technology co., LTD
- 12 -
Appl
icati
on
inter
face
Standard SIM
interface
Support 3.0V/1.8V, support hot swap function
USB2.0
USB2.0 (High-Speed) (only supports slave mode), data
transfer rate up to 480Mbps
For AT commands, data transfer, GNSS NMEA output,
software debugging and software upgrades
USB driver: support Windows / Wince / Android /
Linux, etc.
Hardware reset
interface
Used to reset the module, low effective
UART serial
interface
Main serial port (8 lines):
For AT commands and data transfer
The baud rate is up to 921600bps and the default is
115200bps.
Support RTS and CTS hardware flow control
Debug serial port (2 lines):
Used to print module logs
PCM interface
For audio, requires an external codec chip
Supports 8-bit
μ
-law and 16-bit linear encoding
formats
Support short frame mode
Support main mode
SPI interface
Maximum clock rate up to 26MHz
SPI can only be used as the master, the interface voltage
domain is 1.8V
Reusable I2S interface for external CODEC
SD card interface
4-bit SD/MMC interface
Clock frequency up to 50MHz
Maximum capacity supports 32GB
Interface voltage domain is 1.8/2.95V, two voltages are
adjustable
Power interface
Support 3.3V-4.2V DC power supply
Network status
indication
Used to indicate the status of the module, the speed of
the light is on to indicate different module status