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CLRC663 Datasheet(PDF) 85 Page - NXP Semiconductors |
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CLRC663 Datasheet(HTML) 85 Page - NXP Semiconductors |
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85 / 132 page 
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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