mfrc522 NXP Semiconductors, mfrc522 Datasheet - Page 108

• Manufacturer Part Number: mfrc522
• Description: Contactless Reader Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
10.2.4 Address byte . . . . . . . . . . . . . . . . . . . . . . . 48
10.3
10.3.1 Connection to a host . . . . . . . . . . . . . . . . . 48
10.3.2 Selection of the transfer speeds . . . . . . . . 49
10.3.3 Framing . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
10.4
10.4.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
10.4.2 Data validity. . . . . . . . . . . . . . . . . . . . . . . . 53
10.4.3 START and STOP conditions . . . . . . . . . . 53
10.4.4 Byte format . . . . . . . . . . . . . . . . . . . . . . . . 54
10.4.5 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . 54
10.4.6 7-BIT ADDRESSING. . . . . . . . . . . . . . . . . 55
10.4.7 Register Write Access . . . . . . . . . . . . . . . 56
10.4.8 Register Read Access. . . . . . . . . . . . . . . . 57
10.4.9 HS mode . . . . . . . . . . . . . . . . . . . . . . . . . 58
10.4.10High Speed Transfer . . . . . . . . . . . . . . . . . 58
10.4.11 Serial Data transfer Format in HS mode . . 58
10.4.12Switching from F/S to HS mode and Vice Versa
10.4.13MFRC522 at Lower Speed modes . . . . . . 60
11
11.1
11.2
11.3
11.4
11.5
12
12.1
12.2
12.3
12.4
13
14
15
16
16.1
16.2
16.3
17
17.1
17.2
18
18.1
UART Interface . . . . . . . . . . . . . . . . . . . . . 48
I2C Bus Interface . . . . . . . . . . . . . . . . . . . 52
60
Analog Interface and Contactless UART. . 61
General . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
TX Driver . . . . . . . . . . . . . . . . . . . . . . . . . 61
Serial Data Switch . . . . . . . . . . . . . . . . . . 63
MFIN/MFOUT interface support . . . . . . . . 63
CRC co-processor. . . . . . . . . . . . . . . . . . . 64
FIFO Buffer . . . . . . . . . . . . . . . . . . . . . . . . 65
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Accessing the FIFO Buffer . . . . . . . . . . . . 65
Controlling the FIFO-Buffer . . . . . . . . . . . . 65
Status Information about the FIFO-Buffer . 65
Timer Unit . . . . . . . . . . . . . . . . . . . . . . . . . 67
Interrupt Request System . . . . . . . . . . . . . 68
Oscillator Circuitry . . . . . . . . . . . . . . . . . . . 69
Power Reduction modes . . . . . . . . . . . . . . 70
Hard Power-down . . . . . . . . . . . . . . . . . . . 70
Soft Power-down . . . . . . . . . . . . . . . . . . . . 70
Transmitter Power-down . . . . . . . . . . . . . . 70
Reset and Oscillator Startup Time . . . . . . 71
Reset Timing Requirements . . . . . . . . . . . 71
Oscillator Startup Time . . . . . . . . . . . . . . . 71
General Description . . . . . . . . . . . . . . . . . 72
MFRC522 Command Set . . . . . . . . . . . . . 72
18.2
18.3
18.3.1 MFRC522 Command Description . . . . . . . 73
18.3.1.1Idle Command . . . . . . . . . . . . . . . . . . . . . 73
18.3.1.2Mem Command . . . . . . . . . . . . . . . . . . . . 73
18.3.1.3Generate RandomID Command . . . . . . . 73
18.3.1.4CalcCRC Command. . . . . . . . . . . . . . . . . 73
18.3.1.5Transmit Command . . . . . . . . . . . . . . . . . 73
18.3.1.6NoCmdChange Command . . . . . . . . . . . 73
18.3.1.7Receive Command. . . . . . . . . . . . . . . . . . 74
18.3.1.8Transceive Command . . . . . . . . . . . . . . . 74
18.3.1.9MFAuthent Command . . . . . . . . . . . . . . . 74
18.3.1.10SoftReset Command . . . . . . . . . . . . . . . 75
19
19.1
19.2
19.3
19.3.1 Example: Output TestDAC 1 on AUX1 and
19.3.2 Example: Output Testsignal Corr1 on AUX1
19.3.3 Example: Output ADC channel I on AUX 1 and
19.3.4 Example: Output RxActive on AUX 1 and
19.3.5 Example: Output Rx Data Stream on AUX 1
19.4
20
21
22
23
23.1
23.1.1 Input Pin characteristics for pins EA, I2C and
23.1.2 Input Pin characteristics for pin MFIN . . . . 84
23.1.3 Input/Output Pin characteristics for pins D1,
23.1.4 Input Pin characteristics for pin SDA . . . . 84
23.1.5 Output Pin characteristics for Pin MFOUT 85
23.1.6 Output Pin characteristics for Pin IRQ . . . 85
23.1.7 Input Pin characteristics for Pin Rx . . . . . . 85
23.1.8 Input Pin characteristics for pin OSCIN . . 85
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described herein, have been included in section ‘Legal information’.
© NXP B.V. 2007.
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For sales office addresses, please send an email to: [e-mail]
General Behavior . . . . . . . . . . . . . . . . . . . 72
MFRC522 Commands Overview . . . . . . . 72
Testsignals . . . . . . . . . . . . . . . . . . . . . . . . 76
Selftest . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Test bus. . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Testsignals at pin AUX . . . . . . . . . . . . . . . 77
TestDAC 2 on AUX2 . . . . . . . . . . . . . . . . . 79
and MinLevel on AUX2 . . . . . . . . . . . . . . . 79
ADC channel Q on AUX 2. . . . . . . . . . . . . 80
TxActive on AUX 2 . . . . . . . . . . . . . . . . . . 81
and AUX 2. . . . . . . . . . . . . . . . . . . . . . . . . 82
PRBS (Pseudo-Random Binary Sequence) 82
Limiting values . . . . . . . . . . . . . . . . . . . . . 83
Recommended operating conditions . . . . 83
Thermal characteristics. . . . . . . . . . . . . . . 83
Characteristics . . . . . . . . . . . . . . . . . . . . . 84
Input Pin Characteristics . . . . . . . . . . . . . . 84
NRESET . . . . . . . . . . . . . . . . . . . . . . . . . . 84
D2, D3, D4, D5, D6 and D7 . . . . . . . . . . . 84
Contactless Reader IC
MFRC522
Date of release: 22 May 2007
Document identifier: 112132
All rights reserved.