PT2256 데이터 시트보기 (PDF) - Princeton Technology

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PT2256

Electronic Volume Controller IC

Princeton Technology 

Tel:886-2-66296288

Fax:886-2-29174598

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

Electronic Volume Controller IC

PT2256

INITIALIZATION WHEN POWER ON

PT2256 has an auto-initialization function during the Power On period. When Power is turned ON, the

volume level is set to the initial value of -46 dB by setting the RST pin to “L” level. Please refer to the

diagram below.

VDD

VIL

0V

VDD

/RST

T≥1m s

T

BACK UP WHEN POWER OFF

When the /INH Pin is set at “L” Level, all input and output pins are disabled and the current

consumption is reduced to the minimum. Under this condition, the backup becomes possible. Please

refer to the diagram below:

VDD

0V

No rm al M ode

VDD

4 . 5V

B acku p M od e

B acku p

VDD m in > 4 .5 V

B acku p D ata is lost

No rm al M ode

The backup circuit is given below:

VDD

IN4 001

10 K

51 K

10 K

+

1 000 µF/16 V

-

VD D

/I NH

P T 2256

VSS

V SS

Note:

If the VDD drops from 12V to 4.5V, then the backup is possible for a period of 6 days. However, if

VDD-Vss drops below 4.5V, the backup becomes impossible.

PT2256 V1.7

-7-

August, 2006

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