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TRF7970A
www.ti.com
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
Step 1: Configure Pins I/O_0 to I/O_2 for SPI with SS
Step 2: Set Pin 12 of the TRF7970A (ASK/OOK pin) to 0 for ASK or 1 for OOK
Step 3: Program the TRF7970A registers
The following registers need to be explicitly set before going into the Direct Mode.
1. ISO Control register (0x01) to the appropriate standard
– 0x02 for ISO 15693 High Data Rate
– 0x08 for ISO14443A (106 kbps)
– 0x1A for FeliCa 212 kbps
– 0x1B for FeliCa 424 kbps
2. Modulator and SYS_CLK register (0x09) to the appropriate clock speed and modulation
– 0x21 for 6.78 MHz Clock and OOK (100%) modulation
– 0x20 for 6.78 MHz Clock and ASK 10% modulation
– 0x22 for 6.78 MHz Clock and ASK 7% modulation
– 0x23 for 6.78 MHz Clock and ASK 8.5% modulation
– 0x24 for 6.78 MHz Clock and ASK 13% modulation
– 0x25 for 6.78 MHz Clock and ASK 16% modulation
(See register 0x09 definition for all other possible values)
Example register setting for ISO14443A at 106 kbps:
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?
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?
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ISO Control register (0x01) to 0x08
RX No Response Wait Time register (0x07) to 0x0E
RX Wait Time register (0x08) to 0x07
Modulator control register (0x09) to 0x21 (or any custom modulation)
RX Special Settings register (0x0A) to 0x20
Copyright ? 2011–2014, Texas Instruments Incorporated
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