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OM25180FDKM Datasheet(PDF) 62 Page - NXP Semiconductors |
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OM25180FDKM Datasheet(HTML) 62 Page - NXP Semiconductors |
62 / 149 page ![]() PN5180 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved. Product data sheet COMPANY PUBLIC Rev. 3.0 — 7 October 2016 240930 62 of 149 NXP Semiconductors PN5180 High-performance multi-protocol full NFC Forum-compliant frontend With the options “RF high side push” and “RF low side push”, potentially faster fall times can be achieved for the antenna voltage amplitude at the beginning of a modulation. This basic behavior during modulation cannot be configured independently for TX1 and TX2. Only the clock polarity can be configured separately with TX1_INV_RM and TX2_INV_RM. 11.8.3.2 10 % Amplitude Modulation For a targeted ASK 10 % amplitude modulation, the bits RF_CONTROL_TX_CLK in register TX_CLK_MODE_RM need to be set to value 0b111. Then the signal envelope does not influence the clock behavior thus resulting in an ASK modulation to a modulation index as defined by RF_CONTROL_TX in the bits TX_RESIDUAL_CARRIER. The residual carrier setting is used to adjust the modulation degree at the TX output. A control loop is implemented to keep the modulation degree as constant as possible. The settings and resulting typical residual carrier and modulation degree is given in table below: 110 RF high side push Open-drain, only high side (push) MOS supplied with clock, clock polarity defined by TX2_INV_RM; low side MOS is off 101 RF low side pull Open-drain, only low side (pull) MOS supplied with clock, clock polarity defined by TX1_INV_RM; high side MOS is off 111 13.56 MHz clock derived from 27.12 MHz quartz divided by 2 push/pull Operation, clock polarity defined by invtx; setting for 10 % modulation Table 59. Settings for TX1 and TX2 …continued TX_CLK_MODE_RM (binary) Tx1 and TX2 output Remarks Table 60. Modulation degree configuration TX_RESIDUAL_CARRIER register setting residual carrier nominal (%) modulation degree nominal (%) 00h 100 0 01h 98 1.01 02h 96 2.04 03h 94 3.09 04h 91 4.71 05h 89 5.82 06h 87 6.95 07h 86 7.53 08h 85 8.11 09h 84 8.7 0Ah 83 9.29 0Bh 82 9.89 0Ch 81 10.5 0Dh 80 11.11 0Eh 79 11.73 0Fh 78 12.36 |
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