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TRF7970A
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
6.14.3 Detailed Register Description
6.14.3.1 Main Configuration Registers
6.14.3.1.1 Chip Status Control Register (0x00)
Table 6-25. Chip Status Control Register (0x00)
Function: Control of Power mode, RF on/off, AGC, AM/PM, Direct Mode
Default: 0x01, preset at EN = L or POR = H
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Bit
B7
Name
stby
Function
1 = Standby Mode
0 = Active Mode
Description
Standby mode keeps all supply regulators, 13.56-MHz SYS_CLK oscillator
running. (typical start-up time to full operation 100 μs)
Active Mode (default)
Provides user direct access to AFE (Direct Mode 0) or allows user to add their
B6
B5
B4
B3
B2
B1
B0
direct
rf_on
rf_pwr
pm_on
agc_on
rec_on
vrs5_3
1 = Direct Mode 0 or 1
0 = Direct Mode 2 (default)
1 = RF output active
0 = RF output not active
1 = half output power
0 = full output power
1 = selects Aux RX input
0 = selects Main RX input
1 = AGC on
0 = AGC off
1 = Receiver activated for
external field measurement
0 = Automatic Enable
1 = 5 V operation
0 = 3 V operation
own framing (Direct Mode 1). Bit 6 of ISO Control register must be set by user
before entering Direct Mode 0 or 1.
Uses SPI or parallel communication with automatic framing and ISO decoders
Transmitter on, receivers on
Transmitter off
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
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
RX_IN2 input is used
RX_IN1 input is used
Enables AGC (AGC gain can be set in register 0x0A)
AGC block is disabled
Forced enabling of receiver and TX oscillator. Used for external field
measurement.
Allows enable of the receiver by Bit 5 of this register (0x00)
Selects the V IN voltage range
6.14.3.1.2 ISO Control Register (0x01)
Table 6-26. ISO Control Register (0x01)
Function: Controls the selection of ISO Standard protocol, Direct Mode and Receive CRC
Default: 0x02 (ISO15693 high bit rate, one subcarrier, 1 out of 4); it is preset at EN = L or POR = H
Bit
B7
B6
B5
Name
rx_crc_n
dir_mode
rfid
Function
CRC Receive selection
Direct mode type selection
RFID / Reserved
Description
0 = RX CRC (CRC is present in the response)
1 = no RX CRC (CRC is not present in the response) (1)
0 = Direct Mode 0
1 = Direct Mode 1
0 = RFID Mode
1 = NFC or Card Emulation Mode
RFID: See Table 6-27 for B0:B4 settings based on ISO protocol desired by
application
B4
iso_4
RFID / NFC Target
NFC:
0 = target
1 = initiator
B3
iso_3
RFID / NFC Mode
NFC:
0 = passive mode
1 = active mode
(1)
Only applicable to ISO-14443A and ISO-15693
56
Detailed Description
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