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Pin #
Signal
19
GPIO5
2.8V GPIO
20
GND
Ground
Radio antenna
21
ANT
connection
22
GND
Ground
23
GND
Ground
*
UART signal names are according to PC view.
*
The I/O direction information only concerns the nominal signal. When the signal is configured in GPIO, it can
either be an Input or an Output.
Recommended Connection When Not Used
The table below gives the recommended connection for any unused pins.
Pin #
Signal
1
SPKP
2
SPKN
3
MICP
4
MICN
5
AUX_ADC0
6
BAT-RTC
7
WISMO_READY
8
SIM-VCC
9
SIM-CLK
10
SIM-IO
11
~SIM-RST
WA_DEV_W228_PTS_002
Description
I/O
I/O
Ground
I/O
Ground
Ground
Table 46. Recommended Connection When Not Used
Recommended
Connection When Not
Used
Open
Open
Open
Open
Ground
Open
Open
SIM power supply
SIM clock
SIM data
SIM reset
Rev 001
Product Technical Specification &
Customer Design Guidelines
Pin #
Signal
Description
~CT107/
2.8V UART1: Data
42
DSR
set ready
~CT109/
2.8V UART1: Data
43
DCD
carrier detect
~CT108/
2.8V UART1: Data
44
DTR
terminal ready
~CT125/
2.8V UART1: Ring
45
RI
indicator
VCC_2V
2.8V power supply
46
8
from module
Pin #
Signal
Connection When Not
24
GPIO1
Open
25
SPI-IRQ
PCB test point
26
GND
Ground
27
NC
Not connected
28
GND
Ground
29
VBATT
Power supply
30
VBATT
Power supply
31
GND
Ground
32
NC
Not connected
33
NC
Not connected
34
BUZZER
Open
I/O
O
O
I
O
O
Recommended
Used
Page 99 of 108
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