MFRC522 datasheet(28/109 Pages) NXP

28 / 109 page

112132

Product data sheet

Rev. 3.2 — 22 May 2007

28 of 109

NXP Semiconductors

MFRC522

Contactless Reader IC

9.2.2.6

TxASKReg

Controls the settings of the transmit modulation.

9.2.2.7

TxSelReg

Selects the internal sources for the analog part.

Table 49:

TxAutoReg register (address 15h); reset value: 00h

Bit

Symbol

Force100ASK

Access

Rights

RFU

r/w

RFU

Table 50:

Description of TxAutoReg bits

Bit

Symbol

Description

Reserved for future use.

Force100ASK

Set to logic 1, Force100ASK forces a 100% ASK modulation

independent of the setting in register ModGsPReg.

5 to 0

Reserved for future use.

Table 51:

TxSelReg register (address 16h); reset value: 10h

Bit

Symbol

DriverSel

MfOutSel

Access

Rights

RFU

r/w

Table 52:

Description of TxSelReg bits

Bit

Symbol

Description

7 to 6

Reserved for future use.

5 to 4

DriverSel

Selects the input of driver Tx1 and Tx2.

Value

Description

Tristate

Remark: In soft power-down the drivers are only in tristate

mode if DriverSel is set to tristate mode.

Modulation signal (envelope) from the internal coder, Miller

Pulse Coded.

Modulation signal (envelope) from MIFIN

High

Remark: The High level depends on the setting of

InvTx1RFOn/ InvTx1RFOff and InvTx2RFOn/

InvTx2RFOff.

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