S42
Hardware User Guide
1VV0301303 Rev. 11
Page 26 of 85
2021-05-06
Not Subject to NDA
GPIO[8]/SPI-SCK
GPIO[2]/SPI-MOSI
S42
E-2
SPI-Master
connected device
SPI-Slave
GPIO[5]/SPI-MISO
D-1
F-2
SCK, SPI_CLK
SDI, MOSI
SDO, MISO
typical signals:
Figure 13: S42 SPI Interface (Example: Master Mode)
3.7.
Bluetooth Radio Interface
The S42/AI includes an integrated ceramic antenna.
3.8.
NFC Function
The NFCT peripheral supports communication signal interface type A and 106 kbps bit
rate from the NFC Forum.
With appropriate software, the NFC peripheral can be used to emulate the listening
device NFC-A as specified by the NFC Forum.
Main features for the NFC peripheral:
•
NFC-A listen mode operation
•
13.56 MHz input frequency
•
Bit rate 106 kbps
•
Wake-on-field low power field detection (SENSE) mode
•
Frame assemble and disassemble for the NFC-A frames specified by the NFC
Forum
•
Programmable frame timing controller
•
Integrated automatic collision resolution, CRC, and parity functions
3.8.1.
NFCT Antenna Recommendations
The NFCT antenna coil must be connected differential between NFCANT1 and NFCANT2
pins of S42.
Two external capacitors C
tune1/2
connected between the NFCANTx pins and GND should
be used to tune the resonance of the antenna circuit to 13,56 MHz.
