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CLRC663 Datasheet(PDF) 85 Page - NXP Semiconductors

Part No. CLRC663
Description  Contactless reader IC
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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CLRC663 Datasheet(HTML) 85 Page - NXP Semiconductors

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CLRC663
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.3 — 3 April 2012
171133
85 of 132
NXP Semiconductors
CLRC663
Contactless reader IC
9.8.2 TxAmp
With the set_cw_amplitude register output power can be traded off against power supply
rejection. Spending more headroom leads to better power supply rejection ration and
better accuracy of the modulation degree.
With CwMax set, the voltage of TX1 will be pulled to the maximum possible. This register
overrides the settings made by set_cw_amplitude.
9.8.3 TxCon
Table 128. DrvMode bits
Bit
Symbol
Description
7
Tx2Inv
Inverts transmitter 2 at TX2 pin
6
Tx1Inv
Inverts transmitter 1 at TX1 pin
5RFU
4-
RFU
3
TxEn
If set to 1 both transmitter pins are enabled
2 to 0
TxClkMode
Transmitter clock settings (see 8.6.2. Table 27). Codes 011b and
0b110 are not supported. This register defines, if the output is
operated in open drain, push-pull, at high impedance or pulled to a fix
high or low level.
Table 129. TxAmp register (address 29h)
Bit
7
6
5
4
3
2
1
0
Symbol
set_cw_amplitude
-
set_residual_carrier
Access
rights
r/w
RFU
r/w
Table 130. TxAmp bits
Bit
Symbol
Description
7 to 6
set_cw_amplitude
Allows to reduce the output amplitude of the transmitter by a fix
value.
Four different preset values that are subtracted from TVDD can
be selected:
0: TVDD -100 mV
1: TVDD -250 mV
2: TVDD -500 mV
3: TVDD -1000 mV
5RFU
-
4 to 0
set_residual_ carrier
Set the residual carrier percentage. refer to Section 8.6.2
Table 131. TxCon register (address 2Ah)
Bit
7
6
5
4
3
2
1
0
Symbol
OvershootT2
CwMax
TxInv
TxSel
Access
rights
r/w
r/w
r/w
r/w


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