CS4245
SWITCHING CHARACTERISTICS - CONTROL PORT - I2C FORMAT
Inputs: Logic 0 = DGND = AGND = 0 V, Logic 1 = VLC, C L = 30 pF.
Parameter
SCL Clock Frequency
RESET Rising Edge to Start
Bus Free Time Between Transmissions
Start Condition Hold Time (prior to first clock pulse)
Clock Low time
Clock High Time
Setup Time for Repeated Start Condition
Symbol
f scl
t irs
t buf
t hdst
t low
t high
t sust
Min
-
500
4.7
4.0
4.7
4.0
4.7
Max
100
-
-
-
-
-
-
Unit
kHz
ns
μs
μs
μs
μs
μs
SDA Hold Time from SCL Falling
SDA Setup time to SCL Rising
Rise Time of SCL and SDA
Fall Time SCL and SDA
Setup Time for Stop Condition
Acknowledge Delay from SCL Falling
t hdd
t sud
t rc , t rd
t fc , t fd
t susp
t ack
0
250
-
-
4.7
300
-
-
1
300
-
1000
μs
ns
μs
ns
μs
ns
30. Data must be held for sufficient time to bridge the transition time, t fc , of SCL.
31. Guaranteed by design.
RST
t
Stop
irs
Start
R e p e ate d
Sta rt
t rd
t fd
Stop
SDA
t
buf
t
hdst
t
high
t
hdst
t fc
t susp
SCL
t
lo w
t
hdd
t sud
t ack
t sust
t rc
Figure 10. Control Port Timing - I2C Format
DS656F3
27
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