ST25R3911B datasheet(31/116 Pages) STMICROELECTRONICS

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Table 11. Register preset bits

Bit

Bit name

Function

Address 02h: Table 21. Operation control register

rx_chn

1: one channel enabled → NFCIP-1 active communication (both initiator and

target)

tx_en

0: disable TX operation → NFCIP-1 active communication (both initiator and

target)

Note:

In case of any target mode or NFCIP-1 initiator mode bit tx_en is set to 0 to disable transmitter

in case it was enabled. In NFCIP-1 mode the switching on of the transmitter field is controlled by

dedicated commands.

Address 05h: Table 27. ISO14443A and NFC 106kb/s settings register

nfc_f0

1: Adds SB (F0) and LEN byte during Tx and skip SB (F0) byte during

TX → NFCIP-1 active communication (both initiator and target)

Address 09h: Table 35. Auxiliary definition register

tr_am

Tx Modulation type (depends on mode definition and Tx bit rate)

0: OOK → ISO144443A, NFCIP-1 106 kb/s (both initiator and target), NFC Forum

Type 1 Tag

1: AM → ISO144443B, FeliCa™, NFCIP-1 212 kb/s and 424 kb/s

en_fd

Enables External Field Detector with Peer Detection threshold

0: All modes except NFCIP-1 active communication

1: NFCIP-1 active communication (both initiator and target)

Address 0Ah: Table 36. Receiver configuration register 1

ch_sel

0: Enables AM channel → NFCIP-1 active communication (both initiator and

target)

amd_sel

AM demodulator select (depend on Rx bit rate)

0: Peak detector → All Rx bit rates equal or below fc/16 (848 kb/s)

1: Mixer → All VHBR Rx bit rates (fc/8 and fc/4)

lp2

Low pass control (depends on mode definition and Rx bit rate), see

Table 3. Receiver filter selection and gain range

lp1

lp0

h200

First and third stage zero setting (depends on mode definition and Rx bit rate), see

Table 3. Receiver filter selection and gain range

h80

z12k

Address 0Ch: Table 38. Receiver configuration register 3

lim

Clips output of 1st and 2nd stage

0: All modes except NFCIP-1 active communication

1: NFCIP-1 active communication (both initiator and target)

rg_nfc

Forces gain reduction in 2nd and 3rd gain stage

0: All modes except NFCIP-1 active communication

1: NFCIP-1 active communication (both initiator and target)

ST25R3911B

Application information

DS11793 - Rev 6

page 31/116

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