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OM25180FDKM Datasheet(PDF) 64 Page - NXP Semiconductors |
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OM25180FDKM Datasheet(HTML) 64 Page - NXP Semiconductors |
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64 / 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 64 of 149 NXP Semiconductors PN5180 High-performance multi-protocol full NFC Forum-compliant frontend 11.8.3.4 Over- and Undershoot prevention The over- and undershoot protection allows configurîng additional signals on the Transmitter output which allows to control the signal shaping of the antenna output. The registers TX_OVERSHOOT_CONFIG_REG and TX_UNDERSHOOT_CONFIG_REG are used to configure the over-and undershoot protection. Additionally, in register RF_CONTROL_TX_CLK (bit TX_CLK_MODE_OVUN_PREV) it is defined which TX clock mode for the period the overshoot/undershoot prevention is active, and RF_CONTROL_TX (bit TX_RESIDUAL_CARRIER_OV_PREV) defines the value for the residual carrier for the period the overshoot prevention pattern is active. 11.8.4 Dynamic Power Control (DPC) The Dynamic Power Control allows adjusting the Transmitter output current dependent on the loading condition of the antenna. A lookup table is used to configure the output voltage and by this control the transmitter current. In addition to the control of the transmitter current, wave shaping settings can be controlled dependent on the selected protocol and the measured antenna load. Example with overshoot pattern ‘1100’ (binary) with a length of four and undershoot pattern ‘001’ (binary) with a length of three. Fig 30. Overshoot/Undershoot prevention aaa-009147 clk13 env_gen_outstream tx_outstream delay overshoot protection delay undershoot protection |
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