NXP Semiconductors
MFRC522
Contactless reader IC
S
SDA high
8-bit master code 0000 1xxx
A t1
tH
SCL high
1
2 to 5
6
7
8
9
F/S mode
Sr
SDA high
7-bit SLA
R/W A
n + (8-bit data + A/A)
Sr P
SCL high
1 2 to 5 6 7 8 9
1 2 to 5 6 7 8 9
HS mode
tH
= Master current source pull-up
= Resistor pull-up
Fig 19. I2C-bus HS mode protocol frame
If P then
F/S mode
If Sr (dotted lines)
then HS mode
tFS
msc618
MFRC522_34
Product data sheet
PUBLIC
All information provided in this document is subject to legal disclaimers.
Rev. 3.4 — 5 March 2010
112134
© NXP B.V. 2010. All rights reserved.
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