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CLRC663 Datasheet(PDF) 39 Page - NXP Semiconductors |
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CLRC663 Datasheet(HTML) 39 Page - NXP Semiconductors |
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39 / 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 39 of 132 NXP Semiconductors CLRC663 Contactless reader IC Note: When VDD(TVDD) < 5 V it is not recommended to use a residual carrier < 50 % 8.6.2.1 Overshoot protection The CLRC663 provides an overshoot protection for 100% ASK to avoid overshoots during a PCD communication. Therefore two timers overshoot_t1 and overshoot_t2 can be used. During the timer overshoot_t1 runs an amplitude defined by set_cw_amplitude bits is provided to the output driver. Followed by an amplitude denoted by set_residual_carrier bits with the duration of overshoot_t2. 23 65 21.2 24 60 25.0 25 55 29.0 26 50 33.3 27 45 37.9 28 40 42.9 29 35 48.1 30 30 53.8 31 25 60.0 Table 28. Setting residual carrier ?continuedand modulation index by set_residual_carrier (decimal) residual carrier [%] modulation index [%] Fig 26. Example 1: overshoot_t1 = 2d; overhoot_t2 = 5d. 001aan356 2.50 3.03 3.56 4.10 time (?s) 7.0 5.0 (V) 3.0 1.0 -1.0 |
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