WA_DEV_W218_PTS_002 Rev 005 Page 93 of 109

Product Technical Specification &

Customer Design Guidelines

Recommended Connection When Not Used

The table below gives the recommended connection for any unused pins.

Pin
#
Signa l
Recomm ended
Conne ction when
not Used
Pin
#
Signa l
Recomm ended Conne ction
when not U sed
1
SPKP
open
24
GPIO1
open
2
SPKN
open
25
SPI-IRQ
PCB test point
3
MICP
open
26
GND
Ground
4
MICN
open
27
NC
Not connected
5
AUX_ADC0
Ground
28
GND
Ground
6
BAT-RTC
open
29
VBATT
Power supply
7
WISMO_READY
open
30
VBATT
Power supply
8
SIM-VCC
SIM power supply
31
GND
Ground
9
SIM-CLK
SIM clock
32
NC
Not connected
10
SIM-IO
SIM data
33
NC
Not connected
11
~SIM-RST
SIM reset
34
BUZZER
open
12
~RESET
open
35
PWM1
open
13
SPI-IO
PCB test point
36
PWM0
open
14
SPI-O
PCB test point
37
On/~OFF
Power On control signal
15
SPI-CLK
PCB test point
38
CT103/TXD*
2.8V UART1: Transmit data
16
GPIO3
open
39
~CT105/RTS*
Connect to ~CT106/CTS
17
~SPI-CS
PCB test point
40
CT104/RXD*
2.8V UART1: Receive data
18
TX_CTRL
not connected
41
~CT106/CTS*
Connect to ~CT105/RTS*
19
GPIO5
open
42
~CT107/DSR
Connect to ~CT108/DTRNote 1
20
GND
Ground
43
~CT109/DCD
open
21
ANT
Radio antenna connection
44
~CT108/DTR
Connect to ~CT107/DSR Note 1
22
GND
Ground
45
~CT125/RI
open
23
GND
Ground
46
VCC_2V8
open