SLOS556 – NOVEMBER 2008...........................................................................................................................................................................................
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I
2
C SERIAL CONTROL PORT OPERATION
Timing characteristics for I
2
C Interface signals over recommended operating conditions (unless otherwise noted)
PARAMETER
f
SCL
t
w(H)
t
w(L)
t
r
t
f
t
su1
t
h1
t
(buf)
t
su2
t
h2
t
su3
C
L
Frequency, SCL
Pulse duration, SCL high
Pulse duration, SCL low
Rise time, SCL and SDA
Fall time, SCL and SDA
Setup time, SDA to SCL
Hold time, SCL to SDA
Bus free time between stop and start condition
Setup time, SCL to start condition
Hold time, start condition to SCL
Setup time, SCL to stop condition
Load capacitance for each bus line
t
w(H)
SCL
t
w(L)
t
r
t
f
TEST CONDITIONS
No wait states
MIN
0.6
1.3
MAX
400
UNIT
kHz
µs
µs
300
300
100
0
1.3
0.6
0.6
0.6
400
ns
ns
ns
ns
µs
µs
µs
µs
pF
t
su1
SDA
t
h1
T0027-01
Figure 3. SCL and SDA Timing
SCL
t
h2
t
su2
t
su3
t
(buf)
SDA
Start
Condition
Stop
Condition
T0028-01
Figure 4. Start and Stop Conditions Timing
12
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