mfrc531 NXP Semiconductors, mfrc531 Datasheet - Page 114

• Manufacturer Part Number: mfrc531
• Description: Iso/iec 14443 Reader Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
24. Contents
1
2
3
3.1
4
5
6
7
8
8.1
9
9.1
9.1.1
9.1.2
9.1.3
9.1.3.1
9.1.3.2
9.1.3.3
9.1.4
9.1.4.1
9.1.4.2
9.2
9.2.1
9.2.2
9.2.2.1
9.2.2.2
9.2.2.3
9.2.3
9.2.3.1
9.2.3.2
9.3
9.3.1
9.3.1.1
9.3.2
9.3.3
9.3.4
9.4
9.4.1
9.4.2
9.4.2.1
9.4.2.2
9.4.3
9.4.4
MFRC531_34
Product data sheet
PUBLIC
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
General description . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Quick reference data . . . . . . . . . . . . . . . . . . . . . 3
Ordering information . . . . . . . . . . . . . . . . . . . . . 3
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pinning information . . . . . . . . . . . . . . . . . . . . . . 5
Functional description . . . . . . . . . . . . . . . . . . . 7
Overview of supported microprocessor
interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Automatic microprocessor interface detection . 7
Connection to different microprocessor types . 8
Separate read and write strobe . . . . . . . . . . . . 8
Common read and write strobe . . . . . . . . . . . . 9
Common read and write strobe:
EPP with handshake . . . . . . . . . . . . . . . . . . . . 9
Serial Peripheral Interface . . . . . . . . . . . . . . . . 9
Memory organization of the EEPROM . . . . . . 12
Product information field (read only). . . . . . . . 13
Register initialization files (read/write) . . . . . . 13
StartUp register initialization file (read/write) . 14
Factory default StartUp register
initialization file . . . . . . . . . . . . . . . . . . . . . . . . 14
Register initialization file (read/write) . . . . . . . 16
Crypto1 keys (write only) . . . . . . . . . . . . . . . . 16
Storage of keys in the EEPROM . . . . . . . . . . 17
Controlling the FIFO buffer . . . . . . . . . . . . . . . 18
Interrupt request system . . . . . . . . . . . . . . . . . 19
Interrupt request handling. . . . . . . . . . . . . . . . 20
Controlling interrupts and getting their status . 20
Accessing the interrupt registers . . . . . . . . . . 20
Register overview interrupt request system . . 21
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5
Digital interface . . . . . . . . . . . . . . . . . . . . . . . . . 7
SPI read data . . . . . . . . . . . . . . . . . . . . . . . . . 10
SPI write data . . . . . . . . . . . . . . . . . . . . . . . . . 11
Key format . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
FIFO buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Accessing the FIFO buffer . . . . . . . . . . . . . . . 17
Access rules . . . . . . . . . . . . . . . . . . . . . . . . . . 17
FIFO buffer status information . . . . . . . . . . . . 18
FIFO buffer registers and flags . . . . . . . . . . . . 19
Interrupt sources overview . . . . . . . . . . . . . . . 19
Configuration of pin IRQ . . . . . . . . . . . . . . . . . 21
Rev. 3.4 — 26 January 2010
056634
9.5
9.5.1
9.5.1.1
9.5.1.2
9.5.1.3
9.5.1.4
9.5.2
9.5.2.1
9.5.2.2
9.5.2.3
9.5.3
9.6
9.6.1
9.6.2
9.6.3
9.6.4
9.7
9.7.1
9.7.2
9.7.3
9.7.4
9.8
9.9
9.9.1
9.9.2
9.9.3
9.9.3.1
9.9.3.2
9.9.3.3
9.9.4
9.10
9.10.1
9.10.2
9.10.2.1
9.10.2.2
9.10.2.3
9.10.2.4
9.11
9.11.1
9.11.2
9.11.2.1
9.11.2.2
9.12
9.13
9.14
9.14.1
Timer unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Timer unit implementation . . . . . . . . . . . . . . . 23
Timer unit block diagram . . . . . . . . . . . . . . . . 23
Controlling the timer unit . . . . . . . . . . . . . . . . 23
Timer unit clock and period . . . . . . . . . . . . . . 24
Timer unit status. . . . . . . . . . . . . . . . . . . . . . . 24
Using the timer unit functions. . . . . . . . . . . . . 25
Time-out and WatchDog counters . . . . . . . . . 25
Programmable one shot timer and
periodic trigger . . . . . . . . . . . . . . . . . . . . . . . . 25
Timer unit registers . . . . . . . . . . . . . . . . . . . . 25
Power reduction modes . . . . . . . . . . . . . . . . . 26
Hard power-down. . . . . . . . . . . . . . . . . . . . . . 26
Soft power-down mode . . . . . . . . . . . . . . . . . 26
Standby mode . . . . . . . . . . . . . . . . . . . . . . . . 27
Automatic receiver power-down. . . . . . . . . . . 27
StartUp phase . . . . . . . . . . . . . . . . . . . . . . . . 27
Hard power-down phase . . . . . . . . . . . . . . . . 27
Reset phase. . . . . . . . . . . . . . . . . . . . . . . . . . 28
Initialization phase . . . . . . . . . . . . . . . . . . . . . 28
Initializing the parallel interface type . . . . . . . 28
Oscillator circuit . . . . . . . . . . . . . . . . . . . . . . . 29
Transmitter pins TX1 and TX2 . . . . . . . . . . . . 29
Configuring pins TX1 and TX2. . . . . . . . . . . . 29
Antenna operating distance versus power
consumption. . . . . . . . . . . . . . . . . . . . . . . . . . 30
Antenna driver output source resistance . . . . 30
Source resistance table . . . . . . . . . . . . . . . . . 31
Calculating the relative source resistance . . . 32
Calculating the effective source resistance . . 32
Pulse width. . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Receiver circuitry . . . . . . . . . . . . . . . . . . . . . . 32
Receiver operation. . . . . . . . . . . . . . . . . . . . . 33
Automatic Q-clock calibration . . . . . . . . . . . . 33
Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Correlation circuitry . . . . . . . . . . . . . . . . . . . . 35
Serial signal switch . . . . . . . . . . . . . . . . . . . . 35
Serial signal switch block diagram . . . . . . . . . 36
Serial signal switch registers . . . . . . . . . . . . . 36
Active antenna concept . . . . . . . . . . . . . . . . . 37
Driving both RF parts . . . . . . . . . . . . . . . . . . . 38
MIFARE higher baud rates. . . . . . . . . . . . . . . 38
ISO/IEC 14443 B communication scheme. . . 39
MIFARE authentication and Crypto1 . . . . . . . 40
Crypto1 key handling . . . . . . . . . . . . . . . . . . . 40
Stopwatch . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Receiver circuit block diagram . . . . . . . . . . . . 33
Evaluation and digitizer circuitry . . . . . . . . . . 35
ISO/IEC 14443 reader IC
MFRC531
© NXP B.V. 2010. All rights reserved.
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