ST25R3911B datasheet(2/129 Pages) STMICROELECTRONICS

tên linh kiện	ST25R3911B

Giải thích chi tiết về linh kiện	Automatic antenna tuning system providing tuning of antenna LC tank

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2 / 129 page

Contents

ST25R3911B

2/129

DocID029656 Rev 2

Contents

1

Functional overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1.1

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1.1.1

Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1.1.2

Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1.1.3

Phase and amplitude detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1.1.4

A/D converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1.1.5

Capacitive sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1.1.6

External field detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.1.7

Quartz crystal oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.1.8

Power supply regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.1.9

POR and Bias . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.1.10

RC oscillator and Wake-Up timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.1.11

ISO-14443 and NFCIP-1 framing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.1.12

FIFO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.1.13

Control logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.1.14

SPI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.2

Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.2.1

Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

1.2.2

Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

1.2.3

Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

1.2.4

Capacitive sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

1.2.5

Wake-Up mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

1.2.6

Quartz crystal oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

1.2.7

Timers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

1.2.8

A/D converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

1.2.9

Phase and amplitude detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

1.2.10

External field detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

1.2.11

Power supply system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

1.2.12

Communication with an external microcontroller . . . . . . . . . . . . . . . . . . 32

1.2.13

Direct commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

1.2.14

Start timers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

1.2.15

Test access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

1.2.16

Power-up sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

1.2.17

Reader operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

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