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
6.14.1.1 Main Configuration Registers
6.14.1.1.1 Chip Status Control Register (0x00)
Table 6-16 describes the bit fields of the Chip Status Control register. This register controls the power
mode, RF on or off, AM or PM, and direct mode.
Default Value: 0x01, set at EN = L or POR = H
Table 6-16. Chip Status Control Register (0x00)
BIT NO. BIT NAME FUNCTION DESCRIPTION
B7 stby
1 = Standby mode
Standby mode keeps all supply regulators and the 13.56-MHz SYS_CLK
oscillator running (typical start-up time to full operation is 100 µs).
0 = Active mode Active mode (default)
B6 direct
1 = Direct mode 0 or 1
Provides user direct access to AFE (direct mode 0) or lets the user add
custom framing (direct mode 1). Bit 6 of the ISO Control register must be set
before entering direct mode 0 or 1.
0 = ISO mode (default)
Uses SPI or parallel communication with automatic framing and ISO
decoders
B5 rf_on
1 = RF output active Transmitter on, receivers on
0 = RF output not active Transmitter off
B4 rf_pwr
1 = Half output power
TX_OUT (pin 5) = 8- Ω output impedance
P = 100 mW (+20 dBm) at 5 V, P = 33 mW (+15 dBm) at 3.3 V
0 = Full output power
TX_OUT (pin 5) = 4-
Ω
output impedance
P = 200 mW (+23 dBm) at 5 V, P = 70 mW (+18 dBm) at 3.3 V
B3 pm_on
1 = Selects aux RX input RX_IN2 input is used
0 = Selects main RX
input
RX_IN1 input is used
B2 Reserved
B1 rec_on
1 = Receiver activated
for external field
measurement
Forces enabling of receiver and TX oscillator. Used for external field
measurement.
0 = Automatic enable Allows enable of the receiver by bit 5 of this register
B0 vrs5_3
1 = 5-V operation
Selects the VIN voltage range
0 = 3-V operation