MFRC63002R datasheet(32/118 Pages) NXP

32 / 118 page

MFRC630

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Product data sheet

COMPANY PUBLIC

Rev. 3.1 — 6 September 2012

227531

32 of 118

NXP Semiconductors

MFRC630

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.

Table 19.

Settings for TX1 and TX2

TxClkMode

(binary)

Tx1 and TX2 output

Remarks

000

High impedance

001

output pulled to 0 in any case

010

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 20.

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

9.3

9.9

10.5

11.1

11.7

12.4

13.0

13.6

14.3

14.9

16.3

17.6

19.0

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