CLRC632 Datasheet, PDF (98/163 Pages) NXP Semiconductors – Multiple Protocol Contactless Reader IC

Philips Semiconductors
Multiple Protocol Contactless Reader IC
Product Specification Rev. 3.0; May 2003
CL RC632
13 TRANSMITTER PINS TX1 AND TX2
The signal delivered on TX1 and TX2 is the 13.56 MHz energy carrier modulated by an envelope signal. It
can be used to drive an antenna directly, using a few passive components for matching and filtering (see
chapter 20). For that, the output circuitry is designed with a very low impedance source resistance. The
signal of TX1 and TX2 can be controlled via the TxControl Register.
13.1 Configuration of TX1 and TX2
The configuration possibilities of TX1 are described in the table below:
Register Configuration in TxControl
TX1RFEn
FORCE100ASK
0
X
1
0
1
1
Envelope
X
0
1
0
1
Signal on TX1
LOW (GND)
13.56 MHz carrier frequency modulated
13.56 MHz carrier frequency
LOW
13.56 MHz energy carrier
Table 13-1: Configurations of Pin TX1
The configuration possibilities of TX2 are described in the table below:
Register Configuration in TxControl
TX2RFEn
FORCE100
ASK
TX2CW
InvTX2
0
X
X
X
0
0
1
0
Envelope
X
0
1
0
1
Signal on TX2
LOW
13.56 MHz carrier frequency modulated
13.56 MHz carrier frequency
13.56 MHz carrier frequency modulated,
180° phase shift relative to TX1
13.56 MHz carrier frequency,
180° phase shift relative to TX1
1
1
0
1
1
0
0
1
0
1
1
X
13.56 MHz carrier frequency
X
13.56 MHz carrier frequency, 180° phase shift
relative to TX1
0
LOW
1
13.56 MHz carrier frequency
0
HIGH
1
13.56 MHz carrier frequency,
180° phase shift relative to TX1
X
13.56 MHz carrier frequency
X
13.56 MHz carrier frequency,
180° phase shift relative to TX1
Table 13-2: Configurations of Pin TX2
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