Texas Instruments TRF7960 Manual page 28

TRF7960, TRF7961
SLOU186G – AUGUST 2006 – REVISED MAY 2017
Table 6-22 describes the RX Special Setting register. This register sets the gains and filters directly. The
default is 0x40 and is reset at POR = H or EN = L and at each write to the ISO Control register.
BIT BIT NAME FUNCTION
B7 C212 Band-pass filter of 110 kHz to 570 kHz
B6 C424 Band-pass filter of 200 kHz to 900 kHz
B5 M848 Band-pass filter of 450 kHz to 1.5 MHz
Band-pass filter of 100 kHz to 1.5 MHz
B4 hbt
Gain reduced for 7 dB
B3 gd1 01 = Gain reduction for 5 dB
10 = Gain reduction for 10 dB
B2 gd2
11 = Gain reduction for 15 dB
B1 Reserved
B0 Reserved
Table 6-23 describes the Regulator and I/O Control register. This register controls the three voltage
regulators. The default is 0x87 and is reset at POR = H or EN = L.
Table 6-23. Regulator and I/O Control Register (Address = 0Bh)
BIT BIT NAME FUNCTION
0 = Setting regulator by option bits
B7 auto_reg (vrs3_5 and vrs2, vrs1, and vrs0)
1 = Automatic setting
B6 en_ext_pa Support for external power amplifier
1 = Enable low peripheral
B5 io_low
communication voltage
B4 Unused
B3 Unused
B2 vrs2
B1 vrs1 Voltage set. MSB is B2.
B0 vrs0
28 Detailed Description
Table 6-22. RX Special Setting Register (Address = 0Ah)
COMMENTS
Automatic system sets VDD_RF = (V
VDD_A = VDD_X = (V
Receiver inputs accept externally demodulated subcarrier, OOK pin
becomes modulation output for external amplifier.
When high, the output resistance of logic outputs is decreased. Should be
set high when VDD_I/O voltage is below 2.7 V.
Default is low.
Default is low.
vrs3_5 = L: VDD_RF, VDD_A, VDD_X range 2.7 V to 3.4 V
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COMMENTS
Appropriate for 212-kHz subcarrier system
Appropriate for 424-kHz subcarrier used in ISO/IEC 15693 and Tag-it
Appropriate for Manchester-coded 848-kHz subcarrier used in
ISO/IEC 14443 A
Appropriate for highest bit rate (848 kbps) used in high-bit-rate
ISO/IEC 14443
Sets the RX gain reduction
– 250 mV) but not higher than 3.4 V.
IN
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TRF7960 TRF7961
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– 250 mV) and sets
IN