MFRC63002R datasheet(33/118 Pages) NXP

номер детали	MFRC63002R

подробное описание детали	Contactless reader IC

PDF	118 Pages

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производитель	NXP [NXP Semiconductors]

домашняя страница	http://www.nxp.com

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33 / 118 page

MFRC630

All information provided in this document is subject to legal disclaimers.

Product data sheet

COMPANY PUBLIC

Rev. 3.1 — 6 September 2012

227531

33 of 118

NXP Semiconductors

MFRC630

Contactless reader IC

Note: At VDD(TVDD) <5 V and residual carrier settings <50%, the accuracy of the

modulation index may be low in dependency of the antenna tuning impedance

8.6.2.1

Overshoot protection

The MFRC630 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 20.

Setting residual carrier …continuedand modulation index by

set_residual_carrier (decimal) residual carrier [%]

modulation index [%]

Fig 21. 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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