Product Specs

Table Of Contents
42 NFCT Near field communication tag
Page
436
A
RW
RFU10
Reserved for future use. Shall be 0.
B
RW
CASCADE
Complete
0
Cascade bit (controlled by hardware, write has no effect)
NFCID1 complete
NotComplete
1
NFCID1 not complete
C
RW
RFU43
Reserved for future use. Shall be 0.
D
RW
PROTOCOL
Protocol as defined by the b7:b6 of SEL_RES response in the
NFC Forum, NFC Digital Protocol Technical Specification
E
RW
RFU7
Reserved for future use. Shall be 0.
42.13 Electrical specification
42.13.1 NFCT Electrical Specification
Symbol
Description
Min.
Typ.
Max.
Units
f
c
Frequency of operation
13.56
MHz
C
MI
Carrier modulation index
95
%
DR
Data Rate
106
kbps
f
s
Modulation sub-carrier frequency
f
c
/16
MHz
V
swing
Peak differential Input voltage swing on NFC1 and NFC2
VDD
Vp
V
sense
Peak differential Field detect threshold level on NFC1-NFC2
36
1.0
Vp
I
sense
Current in SENSE STATE
100
nA
I
activated
Current in ACTIVATED STATE
480
µA
R
in_min
Minimum input resistance when regulating voltage swing
40
Ω
R
in_max
Maximum input resistance when regulating voltage swing
1.0
R
in_loadmod
Input resistance when load modulating
8
22
Ω
I
max
Maximum input current on NFC pins
80
mA
42.13.2 NFCT Timing Parameters
Symbol
Description
Min.
Typ.
Max.
Units
t
activate
Time from task_ACTIVATE in SENSE or DISABLE state to
ACTIVATE_A or IDLE state
37
500
us
t
sense
Time from remote field is present in SENSE mode to
20
us
FIELDDETECTED event is asserted
Figure 123: NFCT timing parameters (Shortcuts for FIELDDETECTED and FIELDLOST are disabled)
36
Input is high impedance in sense mode
37
Does not account for voltage supply and oscillator startup times
t
sense
t
activate
t
sense
RF-Carrier
MODES
DISABLE
DISABLE
Activated
IDLERU
SENSE_FIELD
DISABLE
FIELDDETECTED
FIELDLOST
ACTIVATE
READY
SENSE
FIELDDETECTED
TASKS
EVENTS
Bit number
Id
Reset 0x00000000
31 30
0 0
29
0
28
0
27
0
26
0
25
0
24
0
23 22 21 20
0 0 0 0
19
0
18
0
17
0
16
0
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
0
7
E
0
6
D
0
5
D
0
4
C
0
3
C
0
2
B
0
1
A
0
0
A
0
Id RW Field
Value Id
Value
Description