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MFRC522 数据表(PDF) 76 Page - NXP Semiconductors

部件名 MFRC522
功能描述  Contactless reader IC
PDF  96 Pages
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制造商  NXP [NXP Semiconductors]
网页  http://www.nxp.com
标志 NXP - NXP Semiconductors

MFRC522 数据表(HTML) 76 Page - NXP Semiconductors

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MFRC522_33
© NXP B.V. 2009. All rights reserved.
Product data sheet
PUBLIC
Rev. 3 — 26 October 2009
112133
76 of 96
NXP Semiconductors
MFRC522
Contactless reader IC
Table 155. I2C-bus timing in Fast mode
Symbol Parameter
Conditions
Fast mode
High-speed
mode
Unit
Min
Max
Min
Max
fSCL
SCL clock frequency
0
400
0
3400 kHz
tHD;STA
hold time (repeated) START
condition
after this period,
the first clock pulse
is generated
600
-
160
-
ns
tSU;STA
set-up time for a repeated
START condition
600
-
160
-
ns
tSU;STO
set-up time for STOP condition
600
-
160
-
ns
tLOW
LOW period of the SCL clock
1300 -
160
-
ns
tHIGH
HIGH period of the SCL clock
600
-
60
-
ns
tHD;DAT
data hold time
0
900
0
70
ns
tSU;DAT
data set-up time
100
-
10
-
ns
tr
rise time
SCL signal
20
300
10
40
ns
tf
fall time
SCL signal
20
300
10
40
ns
tr
rise time
SDA and SCL
signals
20
300
10
80
ns
tf
fall time
SDA and SCL
signals
20
300
10
80
ns
tBUF
bus free time between a STOP
and START condition
1.3
-
1.3
-
µs
Remark: The signal NSS must be LOW to be able to send several bytes in one data stream.
To send more than one data stream NSS must be set HIGH between the data streams.
Fig 25. Timing diagram for SPI
001aaj634
tSCKL
tSCKH
tSCKL
tDXSH
tSHDX
tDXSH
tSLDX
tSLNH
MOSI
SCK
MISO
MSB
MSB
LSB
LSB
NSS



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