ST25R3911B datasheet(115/116 Pages) STMICROELECTRONICS

115 / 116 page

List of figures

Figure 1.

ST25R3911B block diagram ........................................................... 2

Figure 2.

Minimum configuration with single sided antenna driving (including EMC filter) ........................ 5

Figure 3.

Minimum configuration with differential antenna driving (including EMC filter) ......................... 5

Figure 4.

Receiver block diagram .............................................................. 7

Figure 5.

Capacitive sensor block diagram....................................................... 11

Figure 6.

Phase detector inputs and output in case of 90º phase shift .................................... 16

Figure 7.

Phase detector inputs and output in case of 135º phase shift ................................... 16

Figure 8.

ST25R3911B power supply .......................................................... 17

Figure 9.

Exchange of signals with microcontroller ................................................. 20

Figure 10.

SPI communication: writing a single byte ................................................. 21

Figure 11.

SPI communication: writing multiple bytes ................................................ 21

Figure 12.

SPI communication: reading a single byte ................................................ 22

Figure 13.

SPI communication: loading of FIFO .................................................... 22

Figure 14.

SPI communication: reading of FIFO .................................................... 23

Figure 15.

SPI communication: direct command.................................................... 23

Figure 16.

SPI communication: direct command chaining ............................................. 24

Figure 17.

SPI general timing................................................................. 24

Figure 18.

SPI read timing................................................................... 25

Figure 19.

Direct command NFC Initial Field ON ................................................... 29

Figure 20.

Direct command NFC response field ON ................................................. 30

Figure 21.

ISO14443A states for PCD and PICC ................................................... 38

Figure 22.

Selection of MRT and NRT for a given FDT ............................................... 39

Figure 23.

Flowchart for ISO14443A anticollision with ST25R3911B ...................................... 41

Figure 24.

Transport frame format according to NFCIP-1.............................................. 43

Figure 25.

Connection of tuning capacitors to the antenna LC tank ....................................... 49

Figure 26.

Example of sub-carrier stream mode for scf = 01b and scp = 10b ................................ 51

Figure 27.

Example of BPSK stream mode for scf = 01b and scp = 10b ................................... 52

Figure 28.

Example of Tx in stream mode for stx = 000b and OOK modulation............................... 52

Figure 29.

ST25R3911B QFN32 pinout ......................................................... 96

Figure 30.

TCASE vs. power with different copper area at Tamb = 25°C.................................... 102

Figure 31.

RthCA vs. copper area ............................................................. 102

Figure 32.

QFN32 package outline ............................................................ 103

Figure 33.

VFQFPN - 32 pins, 5x5 mm, 0.5 mm pitch, very thin fine pitch quad flat no lead package outline.......... 105

Figure 34.

VFQFPN - 32 pins, 5x5 mm, 0.5 mm pitch, very thin fine pitch quad flat no lead recommended footprint .... 106

ST25R3911B

List of figures

DS11793 - Rev 6

page 115/116

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