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CLRC663 Datasheet(PDF) 38 Page - NXP Semiconductors

Part No. CLRC663
Description  Contactless reader IC
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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CLRC663 Datasheet(HTML) 38 Page - NXP Semiconductors

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CLRC663
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.3 — 3 April 2012
171133
38 of 132
NXP Semiconductors
CLRC663
Contactless reader IC
The registers Section 9.8 and Section 9.10 control the data rate, the framing during
transmission and the setting of the antenna driver to support the requirements at the
different specified modes and transfer speeds.
Register TXamp and the bits for set_residual_carrier can define the modulation index:
Table 27.
Settings for TX1 and TX2
TxClkMode
(binary)
Tx1 and TX2 output
Remarks
000
High impedance
-
001
0
output pulled to 0 in any case
010
1
output pulled to 1 in any case
110
RF high side push
open drain, only high side (push) MOS supplied
with clock, clock parity defined by invtx; low side
MOS is off
101
RF low side pull
open drain, only low side (pull) MOS supplied
with clock, clock parity defined by invtx; high
side MOS is off
111
13.56 MHz clock derived
from 27.12 MHz quartz
divided by 2
push/pull Operation, clock polarity defined by
invtx; setting for 10% modulation
Table 28.
Setting residual carrier and modulation index by TXamp.set_residual_carrier
set_residual_carrier (decimal) residual carrier [%]
modulation index [%]
099
0.5
198
1.0
296
2.0
394
3.1
491
4.7
589
5.8
687
7.0
786
7.5
885
8.1
984
8.7
10
83
9.3
11
82
9.9
12
81
10.5
13
80
11.1
14
79
11.7
15
78
12.4
16
77
13.0
17
76
13.6
18
75
14.3
19
74
14.9
20
72
16.3
21
70
17.6
22
68
19.0


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