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ST25R3918 Datasheet(PDF) 10 Page - STMicroelectronics

Part # ST25R3918
Description  Multi-purpose NFC transceiver
PDF  141 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25R3918 Datasheet(HTML) 10 Page - STMicroelectronics

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List of figures
ST25R3918
10/141
DS13490 Rev 2
List of figures
Figure 1.
Minimum system configuration - Single sided antenna driving . . . . . . . . . . . . . . . . . . . . . . 13
Figure 2.
Minimum system configuration - Differential antenna driving . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 3.
ST25R3918 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 4.
ST25R3918 QFN32 pinout (top view). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 5.
Receiver block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 6.
Phase detector inputs and output in case of 90º phase shift . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 7.
Phase detector inputs and output in case of 135º phase shift . . . . . . . . . . . . . . . . . . . . . . 34
Figure 8.
ST25R3918 power supply system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 9.
Exchange of signals with a microcontroller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 10.
SPI communication: writing a single byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 11.
SPI communication: writing multiple bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 12.
SPI communication: reading a single byte . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 13.
SPI communication: FIFO loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 14.
SPI communication: FIFO reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Figure 15.
SPI communication: direct command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 16.
SPI communication: direct command chaining . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 17.
Writing a single register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 18.
Writing register data with auto-incrementing address. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 19.
Reading a single byte from a register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 20.
FIFO load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 21.
FIFO read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 22.
Sending a direct command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Figure 23.
Read and Write mode for register space-B access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Figure 24.
I2C master reads slave immediately after the first byte . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Figure 25.
Direct command NFC initial field ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Figure 26.
SPI timing diagram - General operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Figure 27.
SPI timing diagram - Read operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Figure 28.
RPmin vs. VDD, fc = 3.4 MHz. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Figure 29.
Maximum Rbus value vs. bus parasitic capacitance, fc = 3.4 MHz . . . . . . . . . . . . . . . . . 135
Figure 30.
I2C AC waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Figure 31.
I2C AC measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Figure 32.
VFQFPN32 outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Figure 33.
VFQFPN32 recommended footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138



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