MFRC63002R datasheet(31/118 Pages) NXP

31 / 118 page

MFRC630

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Product data sheet

COMPANY PUBLIC

Rev. 3.1 — 6 September 2012

227531

31 of 118

NXP Semiconductors

MFRC630

Contactless reader IC

8.6 Analog interface and contactless UART

8.6.1 General

The integrated contactless UART supports the external host online with framing and error

checking of the protocol requirements up to 848 kbit/s. An external circuit can be

connected to the communication interface pins SIGIN and SIGOUT to modulate and

demodulate the data.

The contactless UART handles the protocol requirements for the communication schemes

in co-operation with the host. The protocol handling itself generates bit- and byte-oriented

framing and handles error detection like Parity and CRC according to the different

contactless communication schemes.

The size, the tuning of the antenna, and the supply voltage of the output drivers have an

impact on the achievable field strength. The operating distance between reader and card

depends additionally on the type of card used.

8.6.2 TX transmitter

The signal delivered on pin TX1 and pin TX2 is the 13.56 MHz carrier modulated by an

envelope signal for energy and data transmission. It can be used to drive an antenna

directly, using a few passive components for matching and filtering, see Section 14

“Application information”. The signal on TX1 and TX2 can be configured by the register

DrvMode, see Section 9.8.1 “TxMode”.

The modulation index can be set by the TxAmp.

Following figure shows the general relations during modulation

Note: When changing the continuous carrier ampliture, the residual carrier amplidude also

changes, while the modulation index remains the same.

Fig 20. General dependences of modulation

001aan355

time

influenced by set_clk_mode

envelope

TX ASK100

1: Defined by set_cw_amplitude.

2: Defined by set_residual_carrier.

TX ASK10

(1)

(2)

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