mfrc522 NXP Semiconductors, mfrc522 Datasheet - Page 52

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

NXP Semiconductors
112132
Product data sheet
10.4.1 General
10.4 I
An Inter IC (I
interface to the host. The implemented I
Semiconductors I
interface can only act in Slave mode. Therefore no clock generation and access
arbitration is implemented in the MFRC522.
The implemented interface is conform to the I
January 2000. The MFRC522 can act as a slave receiver or slave transmitter in Standard
mode, Fast mode and High-speed mode.
SDA is a bi-directional line, connected to a positive supply voltage via a current-source or
a pull-up resistor. Both lines SDA and SCL are set to HIGH level if no data is transmitted.
The MFRC522 has a tri-state output stage to perform the wired-AND function. Data on the
I
400 kbit/s in the Fast mode or up to 3.4 Mbit/s in the High-speed mode.
If the I
specification on SCL and SDA is activated.
For timing requirements refer to
2
2
Fig 11. I
C-bus can be transferred at data rates of up to 100 kbit/s in Standard mode, up to
C Bus Interface
2
C interface is selected, a spike suppression according to the I
2
C interface.
2
C) bus interface is supported to enable a low cost, low pin count serial bus
μ
2
C interface specification, rev. 2.1, January 2000. The implemented
C
Rev. 3.2 — 22 May 2007
Section 23.9 “I
network
pullup
2
configuration
C interface is implemented according the NXP
wiring
2
C-bus specification version 2.1,
2
network
pullup
C Timing”
I2C
EA
D[1..6]
SDA
SCL
Contactless Reader IC
RC522
MFRC522
2
C interface
© NXP B.V. 2007. All rights reserved.
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