PT2257-SL データシートの表示（PDF） - Princeton Technology

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PT2257-SL

Electronic Volume Controller IC

Princeton Technology 

Electronic Volume Controller IC

Tel: 886-2-66296288

Fax: 886-2-29174598

URL: http://www.princeton.com.tw

PT2257

FUNCTION DESCRIPTION

BUS INTERFACE

Data are transmitted to and from the microprocessor to the PT2257 via the SDA and SCL. The SDA

and SCL make up the BUS Interface. It should be noted that the pull-up resistors must be connected to

the positive supply voltage.

DATA VALIDITY

A data on the SDA Line is considered valid and stable only when the SCL Signal is in HIGH State. The

HIGH and LOW States of the SDA Line can only change when the SCL signal is LOW. Please refer to

the figure below.

D ATA

CLK

Data Line

S ta b le ,

Da ta Va lid

Da ta

C h a ng e

Allowed

START AND STOP CONDITIONS

A Start Condition is activated when

1. the SCL is set to HIGH and

2. SDA shifts from HIGH to LOW State.

The Stop Condition is activated when

1. SCL is set to HIGH and

2. SDA shifts from LOW to HIGH State.

Please refer to the timing diagram below.

CLK

DATA

Start

Stop

PT2257 V1.3

-4-

December, 2006

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