SMB239 datasheet(10/30 Pages) SUMMIT

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SMB239

Summit Microelectronics, Inc

2129 3.0 2/23/2009

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

Typ

Max

Units

fSCL

SCL clock frequency

400

kHz

TLOW

Clock low period

1.3

µs

THIGH

Clock high period

0.6

µs

tBUF

Bus free time between a STOP

and a START condition

Before new transmission – Note

1.3

µs

tSU:STA

Start condition setup time

0.6

µs

tHD:STA

Start condition hold time

0.6

µs

tSU:STO

Stop condition setup time

0.6

µs

tAA

Clock edge to data valid

SCL low to valid SDA (cycle n)

0.2

0.9

µs

tRDH

Data output hold time

SCL low (cycle n+1) to SDA

change

0.2

µs

SCL and SDA rise time

Note 3

20 +

0.1Cb

300

SCL and SDA fall time

Note 3

20 +

0.1Cb

300

tSU:DAT

Data in setup time

100

tHD:DAT

Data in hold time

0.9

µs

Noise filter SCL and SDA

Noise suppression

140

tWR_CONFIG

Write cycle time config

Configuration registers

tWR_EE

Write cycle time EE

Memory array

Note 3: Guaranteed by Design.

Figure 4 – I

2C 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)

I2C TIMING DIAGRAMS

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