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2. SYSTEM CONNECTOR INTERFACE
43
LZT 123 7263 R1C
28 ADC3 I Analogue Analogue to digital converter 3
29 SDA I/O 2.75, internal
pull up
I
2
C data
30 SCL O 2.75, internal
pull up
I
2
C clock
31 BUZZER O Digital 2.75 Buzzer output from module
32 OUT5 O Digital 2.75 Programmable output 5
33 LED O Digital 2.75 Flashing LED
34 VIO O Power Out
2.75V
Module power indication. VIO is a
2.75V at 75mA output supply that can
be used to power external circuitry that
interfaces to the GM47
35 TX_ON O Digital 2.75 This output indicates when the GSM
module is going to transmit the burst
36 RI O Digital 2.75 Ring Indicator (UART1)
37 DTR I Digital 2.75 Data Terminal Ready (UART1)
38 DCD O Digital 2.75 Data Carrier Detect (UART1)
39 RTS I Digital 2.75 Request To Send (UART1)
40 CTS O Digital 2.75 Clear To Send (UART1)
41 TD I Digital 2.75 Transmitted Data (UART1).
Data from DTE (host) to DCE (module).
Former DTMS
42 RD O Digital 2.75 Received Data (UART1).
Data from DCE (module) to DTE (host).
Formerly DFMS
43 TD3 I Digital 2.75 UART3 transmission
44 RD3 O Digital 2.75 UART3 reception
45 TD2 I Digital 2.75 UART2 transmission. Used for flashing
the memory. Former CTMS
46 RD2 O Digital 2.75 UART2 Reception. Used for flashing the
memory. Former CFMS
47 PCMULD I Digital 2.75 DSP PCM digital audio input
48 PCMDLD O Digital 2.75 DSP PCM digital audio output
49 PCMOUT O Digital 2.75 Codec PCM digital audio output
50 PCMIN I Digital 2.75 Codec PCM digital audio input
51 PCMSYNC O Digital 2.75 DSP PCM frame sync
52 PCMCLK O Digital 2.75 DSP PCM clock output
53 MICP I Analogue Microphone Input positive
54 MICN I Analogue Microphone Input negative
55 BEARP O Analogue Speaker output positive
Pin Signal Name Dir Signal Type Description