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TRF7970A
www.ti.com
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
6.14.3.3.8 NFCID1 Number Register (0x17)
This register is used to hold the ID of the TRF7970A for use during card emulation and NFC peer-to-peer
target operations.
The procedure for writing the ID into register 0x17 is the following:
1. Write bits 5, 6, and 7 in register 0x18 to enable SDD anticollision (bit 5), and set bit 6 and 7 to select
the ID length of 4, 7, or 10 bytes.
2. Write the ID into register 0x17. This should be done using write continuous mode with 4, 7, or 10 bytes
(according to what was set in register 0x18 bits 6 and 7).
6.14.3.3.9 NFC Target Detection Level Register (0x18)
Table 6-52. NFC Target Detection Level Register (0x18)
Function: Defines level for RF wake up, enables automatic SDD and gives NFCID size. This register is supplied by Vin to ensure data
retention during complete power down.
Default: 0x00 at POR on Vin (not POR based on V DD_X ) and not reset at EN = 0
Bit
Name
Function
Id_s1
Id_s0
Description
NFCID1 Size
(bytes)
B7
B6
Id_s1
Id_s0
NFCID1 size used in 106-
kbps passive target SDD
0
0
1
1
0
1
0
1
4
7
10
Not allowed
B5
B4
B3
Sdd_en
Hi_rf
N/A
Extended range for RF
measurements
Automatic SDD using internal state machine and ID stored in the NFCID1
Number register (0x17)
B2
B1
B0
Rfdet_h2
Rfdet_h1
Rfdet_h0
RF field level required for
system wakeup. If all bits
are 0, then the RF level
detection is off.
Comparator output is displayed in B7 of the NFC Target Protocol register
(0x19)
Copyright ? 2011–2014, Texas Instruments Incorporated
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Detailed Description
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