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4.15.3I2CElectricalData/Timing
TMS320C6727,TMS320C6726,TMS320C6722
Floating-PointDigitalSignalProcessors
SPRS268E–MAY2005–REVISEDJANUARY2007
4.15.3.1Inter-IntegratedCircuit(I2C)Timing
Table4-34andTable4-35assumetestingoverrecommendedoperatingconditions(seeFigure4-38and
Figure4-39).
Table4-34.I2CInputTimingRequirements
NO.MINMAXUNIT
StandardMode10
1t
c(SCL)
Cycletime,I2Cx_SCLµs
FastMode2.5
StandardMode4.7
Setuptime,I2Cx_SCLhighbeforeI2Cx_SDA
2t
su(SCLH-SDAL)
µs
low
FastMode0.6
StandardMode4
3t
h(SCLL-SDAL)
Holdtime,I2Cx_SCLlowafterI2Cx_SDAlowµs
FastMode0.6
StandardMode4.7
4t
w(SCLL)
Pulseduration,I2Cx_SCLlowµs
FastMode1.3
StandardMode4
5t
w(SCLH)
Pulseduration,I2Cx_SCLhighµs
FastMode0.6
StandardMode250
6t
su(SDA-SCLH)
Setuptime,I2Cx_SDAbeforeI2Cx_SCLhighns
FastMode100
StandardMode0
7t
h(SDA-SCLL)
Holdtime,I2Cx_SDAafterI2Cx_SCLlowµs
FastMode00.9
StandardMode4.7
8t
w(SDAH)
Pulseduration,I2Cx_SDAhighµs
FastMode1.3
StandardMode1000
9t
r(SDA)
Risetime,I2Cx_SDAns
FastMode20+0.1C
b
300
StandardMode1000
10t
r(SCL)
Risetime,I2Cx_SCLns
FastMode20+0.1C
b
300
StandardMode300
11t
f(SDA)
Falltime,I2Cx_SDAns
FastMode20+0.1C
b
300
StandardMode300
12t
f(SCL)
Falltime,I2Cx_SCLns
FastMode20+0.1C
b
300
StandardMode4
Setuptime,I2Cx_SCLhighbeforeI2Cx_SDA
13t
su(SCLH-SDAH)
µs
high
FastMode0.6
StandardModeN/A
14t
w(SP)
Pulseduration,spike(mustbesuppressed)ns
FastMode050
StandardMode400
15C
b
CapacitiveloadforeachbuslinepF
FastMode400
Table4-35.I2CSwitchingCharacteristics
(1)
NO.PARAMETERMINMAXUNIT
StandardMode10
16t
c(SCL)
Cycletime,I2Cx_SCLµs
FastMode2.5
StandardMode4.7
Setuptime,I2Cx_SCLhighbeforeI2Cx_SDA
17t
su(SCLH-SDAL)
µs
low
FastMode0.6
StandardMode4
18t
h(SDAL-SCLL)
Holdtime,I2Cx_SCLlowafterI2Cx_SDAlowµs
FastMode0.6
(1)I2CmustbeconfiguredcorrectlytomeetthetimingsinTable4-35.
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