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Stop Start Repeated
Start
Stop
SDA
SCL
1
11 9
TMS320C6454
Fixed-PointDigitalSignalProcessor
SPRS311A–APRIL2006–REVISEDDECEMBER2006
Figure7-42.I2CReceiveTimings
Table7-53.SwitchingCharacteristicsforI2CTimings
(1)
(seeFigure7-43)
-720
-850
-1000
NO.PARAMETERUNIT
STANDARDMODEFASTMODE
MINMAXMINMAX
16t
c(SCL)
Cycletime,SCL102.5µs
Delaytime,SCLhightoSDAlow(fora
17t
d(SCLH-SDAL)
4.70.6µs
repeatedSTARTcondition)
Delaytime,SDAlowtoSCLlow(foraSTART
18t
d(SDAL-SCLL)
40.6µs
andarepeatedSTARTcondition)
19t
w(SCLL)
Pulseduration,SCLlow4.71.3µs
20t
w(SCLH)
Pulseduration,SCLhigh40.6µs
21t
d(SDAV-SDLH)
Delaytime,SDAvalidtoSCLhigh250100ns
Validtime,SDAvalidafterSCLlow(ForI
2
C
22t
v(SDLL-SDAV)
000.9µs
bus™devices)
Pulseduration,SDAhighbetweenSTOPand
23t
w(SDAH)
4.71.3µs
STARTconditions
24t
r(SDA)
Risetime,SDA100020+0.1C
b
(1)
300ns
25t
r(SCL)
Risetime,SCL100020+0.1C
b
(1)
300ns
26t
f(SDA)
Falltime,SDA30020+0.1C
b
(1)
300ns
27t
f(SCL)
Falltime,SCL30020+0.1C
b
(1)
300ns
Delaytime,SCLhightoSDAhigh(forSTOP
28t
d(SCLH-SDAH)
40.6µs
condition)
29C
p
CapacitanceforeachI2Cpin1010pF
(1)C
b
=totalcapacitanceofonebuslineinpF.IfmixedwithHS-modedevices,fasterfall-timesareallowed.
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