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CLRC663 Datasheet(PDF) 51 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) 51 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
51 of 132
NXP Semiconductors
CLRC663
Contactless reader IC
fout = 13.56 MHz  PLLDiv_FB /PLLDiv_Out
8.8.3 Low-Power Oscillator (LPO)
The Low-Power Oscillator (LPO) is implemented to drive a wake-up counter (WUC). This
wakes up the system in regular time intervals and eases the design of a reader that is
regularly polling for card presence or implements a low-power card detection.
The LPO is trimmed during production. Unless a high accuracy of the LPO is required by
the application and the device is operated in an environment with changing ambient
temperatures, trimming of the LPO is not required. For a typical application making use of
the LPO for wake up from power down, the trim values set during production can be used.
Optional trimming is supported by a digital state machine which compares LPO-clock to
a reference clock. As reference the 13.56 MHz crystal clock is available.
Table 41.
Divider values for selected frequencies using the integerN PLL
Frequency [MHz]
4
6
8
10
12
20
24
1.8432 3.6864
PLLDiv_FB
23
272328
232823
28
28
PLLDiv_Out
78
61
39
38
26
19
16
206
103
accuracy [%]
0.04 0.03 0.04 0.08 0.04 0.08 0.04 0.01
0.01
Table 42.
Setting of lpo_trimm [7:0]
value (decimal)
LPO clocks
416
532
664
7
128


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