TRF7970A Datasheet, PDF (56/85 Pages) Texas Instruments – MULTI-PROTOCOL FULLY INTEGRATED 13.56-MHz RFID/NEAR FIELD COMMUNICATION

TRF7970A
SLOS743B – AUGUST 2011 – REVISED MARCH 2012
Table 5-21. Test External RF Peak Level to RSSI Codes
RF_IN1 [mV_PP]
Decimal Code
Binary Code
40
60
80
100
140
180
300
1
2
3
4
5
6
7
001
010
011
001
101
011
111
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5.12.1.15 Receiver Gain Adjust (0x1A)
This command should be executed when the MCU determines that no TAG response is coming and when
the RF and receivers are switched ON. When this command is received, the reader observes the digitized
receiver output. If more than two edges are observed in 100 ms, the window comparator voltage is
increased. The procedure is repeated until the number of edges (changes of logical state) of the digitized
reception signal is less than 2 (in 100 ms). The command can reduce the input sensitivity in 5-dB
increments up to 15 dB. This command ensures better operation in a noisy environment. The gain setting
is reset to maximum gain at EN = 0 and POR = 1.
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Detailed System Description
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