SMM151 datasheet(9/23 Pages) SUMMIT

9 / 23 page

SMM151/152

Preliminary Datasheet

Summit Microelectronics, Inc

2131 2.1 8/15/2008

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

Max

Units

fSCL

SCL Clock Frequency

100

KHz

tLOW

Clock Low Period

4.7

µs

tHIGH

Clock High Period

4.0

µs

tBUF

Bus Free Time

Before New Transmission – Note

4.7

µs

tSU:STA

Start Condition Setup Time

4.7

µs

tHD:STA

Start Condition Hold Time

4.0

µs

tSU:STO

Stop Condition Setup Time

4.7

µs

tAA

Clock Edge to Data Valid

SCL low to valid SDA (cycle n)

0.2

3.5

µs

tDH

Data Output Hold Time

SCL low (cycle n+1) to SDA

change

0.2

µs

SCL and SDA Rise Time

Note 5

1000

SCL and SDA Fall Time

Note 5

300

tSU:DAT

Data In Setup Time

250

tHD:DAT

Data In Hold Time

Noise Filter SCL and SDA

Noise suppression

100

tWR

Write Cycle Time

Note 5: Guaranteed by Design.

TIMING DIAGRAMS

HIGH

LOW

SU:STA

HD:STA

SU:DAT

HD:DAT

SU:STO

BUF

SCL

SDA

(IN)

SDA

(OUT)

WR (For Write Operation Only)

Figure 3. Basic I

2C Serial Interface Timing

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