Texas Instruments TRF7963A, Manual

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TRF7963A
www.ti.com SLOS758G – DECEMBER 2011 – REVISED MARCH 2020
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Detailed Description
Copyright © 2011–2020, Texas Instruments Incorporated
6.14.1.2.7 RX Special Setting Register (0x0A)
Table 6-25 describes the bit fields of the RX Special Setting register. This register sets the gains and
filters directly. When bits B7, B6, B5, and B4 are all zero, the filters are set for ISO/IEC 14443B (240 kHz
to 1.4 MHz).
Default Value: 0x40, set at POR = H or EN = L and at each write to the ISO Control register (0x01)
Table 6-25. RX Special Setting Register (0x0A)
BIT NO. BIT NAME FUNCTION DESCRIPTION
B7 C212 Band-pass 110 kHz to 570 kHz Appropriate for 212-kHz subcarrier system (FeliCa)
B6 C424 Band-pass 200 kHz to 900 kHz
B5 M848 Band-pass 450 kHz to 1.5 MHz
Appropriate for Manchester-coded 848-kHz subcarrier used in
ISO/IEC 14443 A
B4 hbt
Band-pass 100 kHz to 1.5 MHz
Gain reduced for 18 dB Appropriate for highest bit rate (848 kbps) used in high-bit-rate
ISO/IEC 14443
B3 gd1 00 = Gain reduction 0 dB
01 = Gain reduction for 5 dB
10 = Gain reduction for 10 dB
11 = Gain reduction for 15 dB
Sets the RX gain reduction and reduces sensitivity
B2 gd2
B1 Reserved
B0 Reserved
NOTE
The setting of bits B4, B5, B6, and B7 to zero selects band-pass characteristic of 240 kHz to
1.4 MHz. This is appropriate for ISO/IEC 14443 B, FeliCa protocol, and ISO/IEC 14443 A
higher bit rates (212 kbps and 424 kbps).