Specifications

Si2457/34/15/04
46 Rev. 1.3
12 GND Ground.
Connects to the system digital ground.
13 V
A
Regulator Voltage Reference.
Connects to an external capacitor and serves as the reference for the internal
voltage regulator.
14 ESC Escape.
A positive edge on this pin causes the modem to go from online (connected) mode to
the offline (command) mode.
15 DCD
Carrier Detect.
Active low carrier detect.
16 SS
/RTS SPI Slave Select/Request to Send.
Active low slave select in SPI mode.
Active low request to send input used for flow control in UART mode.
Pin # Pin Name Description