mfrc522 NXP Semiconductors, mfrc522 Datasheet - Page 91

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

NXP Semiconductors
112132
Product data sheet
23.9 I
Table 175. Overview I
Symbol Parameter
f
t
t
t
t
t
t
t
t
t
t
t
t
2
SCL
HD;STA
SU;STA
SU;STO
LOW
HIGH
HD;DAT
SU;DAT
rscl
fscl
rsda
fsda
BUF
Fig 31. Timing for F/S mode devices on the I
C Timing
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
Set-up time for STOP condition
LOW period of the SCL clock
HIGH period of the SCL clock
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
2
C Timing in Fast mode
Rev. 3.2 — 22 May 2007
2
C-bus.
1300
Min
600
600
600
600
100
1.3
20
20
20
20
Fast mode
0
0
Max
400
900
300
300
300
300
-
-
-
-
-
-
-
High speed mode
Contactless Reader IC
Min
160
160
160
160
1.3
60
10
10
10
10
10
0
0
MFRC522
© NXP B.V. 2007. All rights reserved.
3400
Max
70
40
40
80
80
-
-
-
-
-
-
-
91 of 109
ns
ns
ns
ns
ns
Unit
kHz
ns
ns
ns
ns
ns
μs
ns