CLRC63201TSLASH0FE datasheet(99/163 Pages) PHILIPS

99 / 163 page

Philips Semiconductors

Product Specification Rev. 3.0; May 2003

Multiple Protocol Contactless Reader IC

CL RC632

Confidential

13.2 Operating Distance versus Power Consumption

The user has the possibility to find a trade-off between maximum achievable operating distance and power

consumption using different antenna matching circuits by varying the supply voltage at the antenna driver

supply pin TVDD. Different antenna matching circuits are described in the Application Note, MIFARE

Design of MF RC500 Matching Circuit and Antennas.

13.3 Antenna Driver Output Source Resistance

The output source conductance of TX1 and TX2 for driving a HIGH level may be adjusted via the value

GsCfgCW in the CwConductance Register in the range from about 1 up to 100 Ohm. The output source

conductance of Tx1 and TX2 during the modulation phase may be adjusted via the value GsCfgMod in the

ModConductance Register in the same range. The values given are relative to the reference resistance Rsrel,

that is measured during production test and stored in the CL RC632 E²PROM. It can be obtained from the

Product Information Field (see chapter 6.2). The electrical specification can be found in chapter 22.4.3.

CLRC63201T/0FE Datasheet(PDF) 99 Page - NXP Semiconductors