PN531 Datasheet, PDF (6/19 Pages) NXP Semiconductors – μC based Transmission module

Philips Semiconductors
PN531
Objective Short Form Specification Rev. 2.0 February 2004
µC based Transmission module
2 BLOCK DIAGRAM
2.1 Simplified PN531 Block Diagram
Analog
Circuitry
Output driver
Integrated
Demodulator
Bit Decoder
Mode-
Detector
RF-Level-
Detector
PN531
Contactless
UART
incl.
Data processing
CRC/Parity
generation &
Check
Framing
Generation &
Check
Bit Coding &
Decoding
80C51 Core,
ROM,
RAM
Host
Interfaces
I2C
serial UART
SPI
USB
Host
Interface
Figure 1: PN531 Block Diagram
The Analog circuitry handles the modulation and demodulation of the analog signals according to the card
mode, reader /writer mode and NFC mode communication scheme.
The RF level detector detects the presence of an external RF field at 13.56 MHz.
The mode detector detects a MIFARE®, FeliCa^TM or NFC coding of an incoming signal in order to prepare
the internal receiver to demodulate signals that are sent to the PN531.
The integrated contactless UART and the firmware handle the protocol requirements for the communication
schemes including the RF based protocols as well as the protocols for host communication.
The microcontroller with its embedded firmware allows autonomous management of communication both on
the RF interface and with the host.
Various host interfaces are implemented to fulfil different customer requirements.
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