GR47/48 Design Guidelines
BA/SEM/MS 03:0015 Rev A
LZT 123 7596
32
25.
VRTC
I
Supply 1.8 V
Voltage for real time clock
26.
ADC1
I
Analogue
Analogue to digital converter 1
27.
ADC2
I
Analogue
Analogue to digital converter 2
28.
ADC3
I
Analogue
Analogue to digital converter 3
29.
SDA
I/O
2.75, internal
pullup
I
2
C Data
30.
SCL
O
2.75, internal
pullup
I
2
C Clock
31.
BUZZER
O
Dig. 2.75
Buzzer output from module
32.
O3
KEYCOL3
DSR
O
O
O
Dig. 2.75
Output 3
Keyboard column 3
Data Set Ready
33.
LED
IO6
O
I/O
Dig. 2.75
Flashing LED
General purpose I/O 6
34.
VIO
O
Power Out
2.75
Module powered indication.
The VIO is a 2.75 V output that could
power external devices to transmit
data towards the GSM device to a
75mA max.
35.
TX_ON
O
Dig 2.75
This output shall indicate when the
GSM module is going to transmit the
burst.
36.
RI
KEYCOL2
O2
O
O
O
Dig. 2.75
Ring Indicator (UART 1)
Keyboard column 2
General purpose output 2
37.
DTR
KEYROW1
IN1
I
I
I
Dig. 2.75
Data Terminal Ready (UART 1)
Keyboard row 1
General purpose input 1
38.
DCD
KEYCOL1
O1
O
O
O
Dig. 2.75
Data Carrier Detect (UART 1)
Keyboard column 1
General purpose output 1
39.
RTS
IO9
I
I/O
Dig. 2.75
Request To Send (UART1)
General purpose I/O 9
40.
CTS
KEYCOL4
O4
O
O
O
Dig. 2.75
Clear To Send (UART 1)
Keyboard column 4
General purpose output 4
41.
TD
I
Dig. 2.75
Transmitted Data (UART 1)
42.
RD
O
Dig. 2.75
Received Data (UART 1)
43.
TD3
I/O7
I
I/O
Dig. 2.75
UART3 Transmission
General purpose I/O 7
44.
RD3
O
Dig. 2.75
UART3 Reception
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