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28
Stop Start Repeated
Start
Stop
SDA
SCL
16
TMS320DM355
DigitalMediaSystem-on-Chip(DMSoC)
SPRS463A–SEPTEMBER2007–REVISEDSEPTEMBER2007
Table5-34.SwitchingCharacteristicsforI2CTimings
(1)
(seeFigure5-40)
DM355
STANDARD
NO.PARAMETERFASTMODEUNIT
MODE
MINMAXMINMAX
16t
c(SCL)
Cycletime,SCL102.5μs
Delaytime,SCLhightoSDAlow(forarepeatedSTART
17t
d(SCLH-SDAL)
4.70.6μs
condition)
Delaytime,SDAlowtoSCLlow(foraSTARTandarepeated
18t
d(SDAL-SCLL)
40.6μs
STARTcondition)
19t
w(SCLL)
Pulseduration,SCLlow4.71.3μs
20t
w(SCLH)
Pulseduration,SCLhigh40.6μs
21t
d(SDAV-SCLH)
Delaytime,SDAvalidtoSCLhigh250100ns
22t
v(SCLL-SDAV)
Validtime,SDAvalidafterSCLlow(ForI2Cdevices)000.9μs
Pulseduration,SDAhighbetweenSTOPandSTART
23t
w(SDAH)
4.71.3μs
conditions
28t
d(SCLH-SDAH)
Delaytime,SCLhightoSDAhigh(forSTOPcondition)40.6μs
29C
p
CapacitanceforeachI2Cpin1010pF
(1)C
b
=totalcapacitanceofonebuslineinpF.IfmixedwithHS-modedevices,fasterfall-timesareallowed.
CAUTION
TheDM355I
2
Cpinsuseastandard±4-mALVCMOSbuffer,nottheslowI/OPbuffer
definedintheI
2
Cspecification.Seriesresistorsmaybenecessarytoreducenoiseat
thesystemlevel.
Figure5-40.I2CTransmitTimings
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