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SR/AI
SR/AP
Hardware Reference
Release r09
Page 20 of 76
3.6 GPIO Interface
It is possible to use the programmable digital I/Os GPIO[0:8] on the SR. Their behavior
has to be defined project specific in the firmware.
Unused GPIO pins can be left unconnected.
3.7 I
2
C Interface
1
The I
2
C bus interface serves as an interface between the internal microcontroller and the serial I
2
C
bus. It provides multimaster capability, and controls all I
2
C bus specific sequencing, protocol,
arbitration and timing. It supports standard (100kHz) and fast (400kHz) speed modes.
GPIO[1]/I2C-SDA and GPIO[0]/I2C-SCL can be used to form an I
2
C interface. It is required to
connect 4k7 pull-up resistors on I2C-SCL and I2C-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
Figure 7: SR I
2
C Interface
3.8 NFC Support
2
From SPP firmware version V1.500 on and higher the NFC TAG NXP: NT3H1101 will be
supported by using the following signals:
SR
Pin Number
SR
Signal Name
NFC Function
Signal Name
Type
Function
D-3
GPIO[0]
NFC_SCLK
O-OD
NFC TAG NXP: NT3H1101 I
2
C SCLK
B-2
GPIO[1]
NFC_SDA
I/O
NFC TAG NXP: NT3H1101 I
2
C SDA
C-3
GPIO[7]
NFC_FD
I-PU
NFC TAG NXP: NT3H1101 Field Detect
1
subject to firmware support, contact Stollmann for current status.
2
SPP FW version V1.500 and higher will use this interface to support NFC TAG NXP: NT3H1101 I
2
C
interface.
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