MFRC522_(2007) 查看數據表（PDF） - NXP Semiconductors.
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MFRC522_ Datasheet PDF : 109 Pages
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NXP Semiconductors
MFRC522
Contactless Reader IC
23.9 I2C Timing
Table 175. Overview I2C Timing in Fast mode
Symbol Parameter
fSCL
tHD;STA
tSU;STA
SCL clock frequency
Hold time (repeated) START condition.
After this period, the first clock pulse is
generated
Set-up time for a repeated START
condition
tSU;STO Set-up time for STOP condition
tLOW
LOW period of the SCL clock
tHIGH HIGH period of the SCL clock
tHD;DAT
tSU;DAT
trscl
tfscl
trsda
tfsda
tBUF
Data hold time
Data set-up time
Rise time SCL signals
Fall time SCL signals
Rise time of both SDA and SCL signals
Fall time of both SDA and SCL signals
Bus free time between a STOP and
START condition
Fast mode
Min Max
0
400
600
-
600
-
600
-
1300
-
600
-
0
900
100
-
20
300
20
300
20
300
20
300
1.3
-
High speed mode Unit
Min
Max
0
3400 kHz
160
-
ns
160
-
ns
160
-
ns
160
-
ns
60
-
ns
0
70
ns
10
-
ns
10
40
ns
10
40
ns
10
80
ns
10
80
ns
1.3
-
μs
Fig 31. Timing for F/S mode devices on the I2C-bus.
112132
Product data sheet
Rev. 3.2 — 22 May 2007
© NXP B.V. 2007. All rights reserved.
91 of 109
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