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OM25180FDKM Datasheet(PDF) 12 Page - NXP Semiconductors |
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OM25180FDKM Datasheet(HTML) 12 Page - NXP Semiconductors |
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12 / 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 12 of 149 NXP Semiconductors PN5180 High-performance multi-protocol full NFC Forum-compliant frontend internally (except pin RESET_N itself). IRQ, BUSY, AUX1, AUX2 have an internal pull down resistor which is activated on RESET_N ==0. All other output pins are switched to high impedance. To leave the power-down mode, the level at the pin RESET_N has to be set to HIGH. This high level starts the internal start-up sequence from Power-Down. 11.2.1.3 Standby The standby mode is entered immediately after sending the instruction SWITCH_MODE with standby command. All internal current sinks are set to low-power state. In opposition to the power-down mode, the digital input buffers are not separated by the input pads and keep their functionality. The digital output pins do not change their state. During standby mode, all registers values, the buffer content and the configuration itself are not kept, exceptions are the registers with addresses 05h(PADCONFIG_REG), 07h(PADOUT_REG) 25h (TEMP_CONTROL). To leave the standby mode, various possibilities do exist. The conditions for wake-up are configured in the register STBY_CFG_REG. • Wake-up via Timer • Wake-up via RF level detector • Low Level on RESET_N • PVDD disappears Any host communication (data is not validated) triggers the internal start-up sequence. The reader IC is in operation mode when the internal start-up sequence is finalized, and is indicating this by an IDLE IRQ. 11.2.1.4 Temperature Sensor The PN5180 implements a configurable temperature sensor. The temperature sensor is configurable by the TEMP_CONTROL register (25h). The Temperature Sensor supports temperature settings for 85 °C, 115 °C, 125 °C and 135 °C. In case the sensed device temperature is higher than configured, a TEMPSENS_ERROR IRQ is raised. In case of an TEMPSENS_ERROR, the Firmware is switching off the RF Field. Additionally host can set the device into standby. 11.2.2 Reset and start-up time A constant low level of at least 10 s at the RESET_N pin starts the internal reset procedure. When the PN5180 has finished the start_up, a IDLE_IRQ is raised and the IC is ready to receive commands on the host interface. 11.2.3 Clock concept The PN5180 is supplied by an 27.12 MHz crystal for operation. In addition, the internal PLL uses an accurate external clock source of either 8, 12, 16, 24 MHz instead of the crystal. |
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