SIM18 EVB kit User Guide
Table 6: Test pin definition
Pin
Signal
I/O
Description
1 SCL1 O
I2C clock
2 VRTC I
1.8V VRTC input
3 SDA1 IO
I2C data
4 VCC_3V I
VCC_3V
input
5
EINT0
I
External interrupt input
6 GND
GND
7 TIMEMARK O
1PPS
output
8 RXD/MOSI/SDA2 I
For UART: receive data
For SPI: slave input
For I2C: data line
9 NRESET I
Reset input
10
TXD/MISO/SCL2
O
For UART: transmit data
For SPI: slave output
For I2C: clock line
11 ON_OFF
I
ON_OFF control input
12 WAKEUP O
Status indicate
13 CTS/SCLK
I
For UART: CTS signal
For SPI: clock input
14
RTS/SCS
O
For UART: RTS signal
For SPI: chip select input
Note: all signals in above table are in 3V domain.
3.2.4 DC_5V Interface
If SIM18-EVB board is powered via VCC_5V, the S301 switch should be set to DC_5V.
Figure 8: DC_5V interface
SIM18_EVB kit_User Guide_V1.01
2010.11.16
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