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OM25180FDKM Datasheet(PDF) 61 Page - NXP Semiconductors |
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OM25180FDKM Datasheet(HTML) 61 Page - NXP Semiconductors |
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61 / 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 61 of 149 NXP Semiconductors PN5180 High-performance multi-protocol full NFC Forum-compliant frontend After power-up, the RF-field is off. The instruction RF_ON enables the generation of a RF-field. The NFC frontend can perform an initial RF collision avoidance according to ISO/IEC18092. Before enabling the RF-field, a field detection is automatically enabled for TIDT. In case an external field is detected, the field is not switched on and an RF_ACTIVE_ERROR_IRQ is raised. The cause for the error can be examined in the RF_STATUS_REG. In order to switch off the RF-field generation, the RF_OFF instruction needs to be sent. Active Mode is supported by configuring the RF_ON instruction. 11.8.3 Transmitter TX The transmitter is able to drive an antenna circuit connected to outputs TX1 and TX2 with a 13.56 MHz carrier signal. The signal delivered on pins TX1 and pin TX2 is the 13.56 MHz carrier modulated by an envelope signal for energy and data transmission. It can be used to drive an antenna directly, using a few passive components for matching and filtering. For a differential antenna configuration, either TX1 or TX2 can be configured to put out an inverted clock. 100 % modulation and several levels of amplitude modulation on the carrier can be performed to support 13.56 MHz carrier-based RF-reader/writer protocols as defined by standards ISO/IEC14443 A and B, FeliCa and ISO/IEC 18092. 11.8.3.1 100 % Modulation There are 5 choices for the output stage behavior during 100 % modulation, and one setting for 10 % modulation. This modulation is controlled by TX_CLK_MODE_RM in RF_CONTROL_TX_CLK: Fig 29. PN5180 Output driver aaa-008643 PRE-DRIVERS TVDD TVDD TX1 M2 M1< envelope clk_highside clk_lowside hs_gate ls_gate<14:0> Table 59. Settings for TX1 and TX2 TX_CLK_MODE_RM (binary) Tx1 and TX2 output Remarks 000 High impedance - 001 0 output pulled to 0 in any case 010 1 output pulled to 1 in any case |
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