MFRC63002R datasheet(36/118 Pages) NXP

36 / 118 page

MFRC630

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Product data sheet

COMPANY PUBLIC

Rev. 3.1 — 6 September 2012

227531

36 of 118

NXP Semiconductors

MFRC630

Contactless reader IC

During low power card detection the DC levels at the I- and Q-channel mixer outputs are

evaluated. This requires that mixers are directly connected to the ADC. This can be

configured by setting the bit Rx_ADCmode in register Rcv (38h).

8.6.4 Active antenna concept

Two main blocks are implemented in the MFRC630. A digital circuitry, comprising state

machines, coder and decoder logic and an analog circuitry with the modulator and

antenna drivers, receiver and amplification circuitry. For example, the interface between

these two blocks can be configured in the way, that the interfacing signals may be routed

to the pins SIGIN and SIGOUT. The most important use of this topology is the active

antenna concept where the digital and the analog blocks are separated. This opens the

possibility to connect e.g. an additional digital block of another MFRC630 device with a

single analog antenna front-end.

The Table 22 and Table 23 describe the necessary register configuration for the use case

active antenna concept.

The interface between these two blocks can be configured in the way, that the interfacing

signals may be routed to the pins SIGIN and SIGOUT (see Figure 25 “Overview

SIGIN/SIGOUT Signal Routing”).

This topology supports, that some parts of the analog part of the MFRC630 may be

connected to the digital part of another device.

The switch SigOutSel in registerSigOut can be used to measure signals. This is especially

important during the design In phase or for test purposes to check the transmitted and

received data.

Fig 24. Block diagram of the active Antenna concept

Table 22.

Value (binary)

Description

SigOut.SigOutSel

0100

TxEnvelope

Rcv.SigInSel

Receive over SigIn (ISO/IEC14443A)

Receive over SigIn (Generic Code)

DrvCon.TxSel

Low (idle)

Table 23.

Value (binary)

Description

SigOut.SigOutSel

0110

0111

Generic Code (Manchester)

Manchester with Subcarrier (ISO/IEC14443A)

Rcv.SigInSel

Internal

DrvCon.TxSel

External (SigIn)

RxCtrl.RxMultiple

RxMultiple on

001aam307

SIGIN

SIGOUT

READER IC

(DIGITAL)

READER IC

(ANTENNA)

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