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TRF7970A
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
Table 6-15. NFC Target Detection Level Register
www.ti.com
Bit
B7
B6
B5
B4
B3
B2
B1
B0
Signal Name
Id_s1
Id_s0
Sdd_en
Hi_rf
Rfdet_h2
Rfdet_h1
Rfdet_h0
Function
NFCID1 size used in 106 kbps passive target SDD
1 = Enables internal SDD protocol
N/A
Extended range for RF measurements
RF field level required for system wake-up. If all
bits are 0, the RF level detection is switched off.
Comments
Automatic SDD using internal state machine and ID
stored in NFCID Number register (1)
Comparator output is displayed in NFC Target
Protocol register B7 (rf_h)
(1)
Refer to the device errata ( SLOZ011 ) for details on automatic SDD dependencies.
Default: reset to 00 at POR on VEXT (not on POR based on V DD_X ), not reset at EN = 0
Table 6-16. Bits B0 to B3 of the NFC Target Detection Level Register
b0 B1 B2
000
001
010
011
100
101
110
111
B3 = 0
B3 = 1
RF Vpp
RF Vpp
Not active
Not active
480 mV
1500 mV
350 mV
700 mV
250 mV
500 mV
220 mV
450 mV
190 mV
400 mV
180 mV
320 mV
170 mV
280 mV
When the voltage supply system and the oscillator are started and is stable, the osc_ok goes high (B6 of
RSSI Level and Oscillator Status register) and IRQ is sent with bit B2 = 1 of IRQ register (field change).
Bit B7 NFC Target Protocol in register directly displays the status of RF level detection (running constantly
also during normal operation). This informs the MCU that the chip should start operation as an NFC
TARGET device.
When the first command from the INITIATOR is received another IRQ sent with B6 (RX start) set in IRQ
register. The MCU must set EN = H (confirm the power-up) in the time between the two IRQs as the
internal power-up ends after the second IRQ. The type and coding of the first initiator (or reader in the
case of a tag emulator) command define the communication protocol type which the target must use. So
the communication protocol type is available in the NFC Target Protocol register immediately after
receiving the first command. The coding of the NFC Target Protocol register is described next.
NFC Target Protocol Register (0x19) – displays the bit rate and protocol type (active or passive)
transmitted by initiator in the first command. It also displays the comparator outputs of both RF level
detectors.
Table 6-17. NFC Target Protocol Register
Bit
B7
B6
B5
B4
B3
B2
Signal Name
Rf_h
Rf_l
FeliCa
Pas106
Pas14443B
Function
1 = RF level is above the set wake-up level
1 = RF level is above the RF collision avoidance
level.
N/A
1 = FeliCa type
0 = ISO14443A type
Passive target 106 kbps or tag emulation
Tag emulation ISO14443B
Comments
The wake-up level is defined by bits b0-b3 of NFC
Target Detection Level register
The collision avoidance level is defined by bits b0-
b2 of NFC Low Field Detection Level register
The first initiator command had physical level
coding like FeliCa or like ISO14443A
The first initiator/reader command was SENS_REQ
or ALL_REQ
The first reader command was of ISO14443B type
B1
Nfcbr1
00
= N/A
48
B0
Nfcbr0
Detailed Description
Bit rate of first received command
01
10
11
= 106 kbps
= 212 kbps
= 424 kbps
Copyright ? 2011–2014, Texas Instruments Incorporated
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