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SLOS732G – JUNE 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)
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