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SR/AI
SR/AP
Hardware Reference
Release r09
Page 21 of 76
GPIO[1]/NFC-SDA and GPIO[0]/NFC-SCL are used to form the I
2
C interface. It is required to
connect 4k7 pull-up resistors on NFC-SCL and NFC-SDA when this interface is used.
I2C-SCL
I2C-SDA
GPIO[0]/I2C-SCL
GPIO[1]/I2C-SDA
SR
VSUP
Rpu
4k7
+3.3V
B-2
D-3
C-1,E-6,F-6
+3.3V
Rpu
4k7
+3.3V
NXP: NT3H1101
3
5
VCC
6
FD (OD)
GPIO[7]/FD
PU in CPU
4
C-3
Figure 8: Connection to the NFC Tag NXP: NT3H1101
The NFC TAG NXP: NT3H1101 works over the full voltage and temperature range of the
SR.
3.9 SPI Serial Peripheral Interface
3
The serial peripheral interface (SPI) allows half/full-duplex, synchronous, serial communication with
external devices. The interface can be configured as the master and in this case it provides the
communication clock (SCK) to the external slave device. The interface is also capable of operating
in multi master configuration. It may be used for a variety of purposes, including simplex
synchronous transfer on two lines with a possible bidirectional data line or reliable communication
using CRC checking. Module pins are used as follows:
GPIO[2]: SPI-MOSI
GPIO[5]: SPI-MISO
GPIO[8]: SPI-SCK
3
subject to firmware support, contact Stollmann for current status
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