CLRC663 datasheet(39/132 Pages) NXP

номер детали	CLRC663

подробное описание детали	Contactless reader IC

PDF	132 Pages

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производитель	NXP [NXP Semiconductors]

домашняя страница	http://www.nxp.com

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CLRC663

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Product data sheet

COMPANY PUBLIC

Rev. 3.3 — 3 April 2012

171133

39 of 132

NXP Semiconductors

CLRC663

Contactless reader IC

Note: When VDD(TVDD) < 5 V it is not recommended to use a residual carrier < 50 %

8.6.2.1

Overshoot protection

The CLRC663 provides an overshoot protection for 100% ASK to avoid overshoots during

a PCD communication. Therefore two timers overshoot_t1 and overshoot_t2 can be used.

During the timer overshoot_t1 runs an amplitude defined by set_cw_amplitude bits is

provided to the output driver. Followed by an amplitude denoted by set_residual_carrier

bits with the duration of overshoot_t2.

21.2

25.0

29.0

33.3

37.9

42.9

48.1

53.8

60.0

Table 28.

Setting residual carrier …continuedand modulation index by

set_residual_carrier (decimal) residual carrier [%]

modulation index [%]

Fig 26. Example 1: overshoot_t1 = 2d; overhoot_t2 = 5d.

001aan356

2.50

3.03

3.56

4.10

time (μs)

7.0

5.0

(V)

3.0

1.0

-1.0

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