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TRF7970A
www.ti.com
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
6.14.3.3.3 RSSI Levels and Oscillator Status Register (0x0F)
Table 6-47. RSSI Levels and Oscillator Status Register (0x0F)
Function: Displays the signal strength on both reception channels and RF amplitude during RF-off state. The RSSI values are valid from
reception start till start of next transmission.
Bit
B7
B6
B5
B4
Name
Unused
osc_ok
rssi_x2
rssi_x1
Function
Crystal oscillator stable
indicator
MSB RSSI value of auxiliary
RX (RX_IN2)
Auxiliary channel RSSI
Description
13.56-MHz frequency stable ( ≈ 200 μs)
Auxiliary channel is by default RX_IN2. The input can be swapped by B3 = 1
(Chip State Control register 0x00). If "swapped", the Auxiliary channel is
connected to RX_IN1 and, hence, the Auxiliary RSSI represents the signal level
B3
B2
rssi_x0
rssi_2
MSB RSSI value of auxiliary at RX_IN2.
RX (RX_IN2)
MSB RSSI value of main
RX (RX_IN1)
B1
B0
rssi_1
rssi_0
Main channel RSSI
LSB RSSI value of main RX
(RX_IN1)
Active channel is default and can be set with option bit B3 = 0 of chip state
control register 0x00.
RSSI measurement block is measuring the demodulated envelope signal (except in case of direct
command for RF amplitude measurement described later in direct commands section). The measuring
system is latching the peak value, so the RSSI level can be read after the end of receive packet. The
RSSI value is reset during next transmit action of the reader, so the new tag response level can be
measured. The RSSI levels calculated to the RF_IN1 and RF_IN2 are presented in Section 6.5.1.1 and
Section 6.5.1.2 . The RSSI has 7 steps (3 bits) with 4-dB increment. The input level is the peak to peak
modulation level of RF signal measured on one side envelope (positive or negative).
6.14.3.3.4 Special Functions Register (0x10)
Table 6-48. Special Functions Register (0x10)
Function: User configurable options for ISO14443A specific operations
Bit
B7
B6
B5
B4
B3
B2
Name
par43
next_slot_37us
Sp_dir_mode
4_bit_RX
Function
Reserved
Reserved
Disables parity checking for
ISO14443A
0 = 18.88 μs
1 = 37.77 μs
Bit stream transmit for
MIFARE at 106 kbps
0 = normal receive
1 = 4-bit receive
Description
Reserved
Reserved
Sets the time grid for next slot command in ISO15693
Enables direct mode for transmitting ISO14443A data, bypassing the FIFO and
feeding the data bit stream directly onto the encoder.
Enable 4-bit replay for example, ACK, NACK used by some cards; for example,
MIFARE Ultralight
0 = anticollision framing
B1
14_anticoll
(0x93, 0x95, 0x97)
1 = normal framing (no
Disable anticollision frames for 14443A (this bit should be set to 1 after
anticollision is finished)
broken bytes)
B0
col_7_6
0 = 7 subcarrier pulses
1 = 6 subcarrier pulses
Selects the number of subcarrier pulses that trigger collision error in the
14443A - 106 kbps
Copyright ? 2011–2014, Texas Instruments Incorporated
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