SMB239
I2C-2 WIRE SERIAL INTERFACE AC OPERATING CHARACTERISTICS – 400 kHz
TA= 0°C to +70°C, VIN = +5.0V, VFLOAT = +4.2V unless otherwise noted. All voltages are relative to GND.
400kHz
Symbol
Description
Conditions
Min
0
1.3
0.6
Typ
Max Units
fSCL
TLOW
THIGH
SCL clock frequency
Clock low period
Clock high period
400
kHz
µs
µs
Bus free time between a STOP
Before new transmission – Note
3
tBUF
1.3
µs
and a START condition
tSU:STA
tHD:STA
tSU:STO
tAA
Start condition setup time
Start condition hold time
Stop condition setup time
Clock edge to data valid
0.6
0.6
0.6
0.2
µs
µs
µs
µs
SCL low to valid SDA (cycle n)
0.9
SCL low (cycle n+1) to SDA
tRDH
tR
Data output hold time
SCL and SDA rise time
SCL and SDA fall time
0.2
µs
change
20 +
Note 3
Note 3
300
300
ns
0.1Cb
20 +
tF
ns
0.1Cb
tSU:DAT
tHD:DAT
TI
tWR_CONFIG
tWR_EE
Data in setup time
Data in hold time
Noise filter SCL and SDA
Write cycle time config
Write cycle time EE
100
0
ns
µs
ns
ms
ms
0.9
Noise suppression
Configuration registers
Memory array
140
10
5
Note 3: Guaranteed by Design.
I2C 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 4 – I2C Timing Diagrams
Summit Microelectronics, Inc
2129 3.0 2/23/2009
10
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
