PAS109B datasheet(9/15 Pages) PIXART

9 / 15 page

PixArt Imaging Inc.

PAS109B

CMOS Image Sensor IC

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PixArt Imaging Inc.

E-mail: fae_service@pixart.com.tw

V1.1, Mar. 2002

5.3 I

2C Bus Timing

Fig 5.4 I

2C Bus Timing

5.4 I

2C Bus Timing Specification

STANDARD-MODE

PARAMETER

SYMBOL

MIN.

MAX.

UNIT

SCL clock frequency

fscl

400

kHz

Hold time (repeated) START condition.

After this period, the first clock pulse is generated.

tHD:STA

4.0

Low period of the SCL clock

tLOW

4.7

HIGH period of the SCL clock

tHIGH

0.75

Set-up time for a repeated START condition

tSU;STA

4.7

Data hold time. For I2C-bus device

tHD;DAT

3.45

Data set-up time

tSU;DAT

250

Rise time of both SDA and SCL signals

N.D.

ns(note1)

Fall time of both SDA and SCL signals

N.D.

ns(note1)

Set-up time for STOP condition

tSU;STO

4.0

Bus free time between a STOP and START

tBUF

4.7

Capacitive load for each bus line

Noise margin at LOW level for each connected

device (including hysteresis)

VnL

0.1

VDD

Noise margin at HIGH level for each connected

device (including hysteresis)

VnH

0.2

VDD

Note: It depends on the "high" period time of SCL.

SDA

SCL

ttttf

ttttHD;STA

ttttLOW

ttttr

ttttHD;DAT

ttttHIGH

ttttSU;DAT

ttttf

ttttSU;STA

ttttHD;STA

ttttSP

ttttSU;STO

ttttBUF

ttttr

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