SMM151/152
Preliminary Datasheet
I2C 2-WIRE SERIAL INTERFACE AC OPERATING CHARACTERISTICS – 100kHz
TA= 0°C to +70°C, VDD = 2.7V to 5.5V unless otherwise noted. All voltages are relative to GND. See Figure 3 Timing
Diagram.
Symbol Description
Conditions
Min Typ
0
Max Units
fSCL
SCL Clock Frequency
100
KHz
tLOW
tHIGH
Clock Low Period
Clock High Period
4.7
4.0
µs
µs
Before New Transmission – Note
5
tBUF
Bus Free Time
4.7
µs
tSU:STA
tHD:STA
tSU:STO
tAA
Start Condition Setup Time
Start Condition Hold Time
Stop Condition Setup Time
Clock Edge to Data Valid
4.7
4.0
4.7
0.2
µs
µs
µs
µs
SCL low to valid SDA (cycle n)
3.5
SCL low (cycle n+1) to SDA
change
tDH
Data Output Hold Time
0.2
µs
tR
tF
tSU:DAT
tHD:DAT
TI
SCL and SDA Rise Time
SCL and SDA Fall Time
Data In Setup Time
Data In Hold Time
Noise Filter SCL and SDA
Write Cycle Time
Note 5
Note 5
1000
300
ns
ns
ns
ns
ns
ms
250
0
Noise suppression
100
tWR
5
Note 5: Guaranteed by Design.
TIMING DIAGRAMS
tWR (For Write Operation Only)
tHIGH
tLOW
tR
tF
SCL
tBUF
tHD:DAT
tSU:DAT
tSU:STA
tSU:STO
tHD:STA
SDA (IN)
tAA
tDH
SDA (OUT)
Figure 3. Basic I2C Serial Interface Timing
Summit Microelectronics, Inc
2131 2.198/15/2008
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
