PT2256V データシートの表示（PDF） - Princeton Technology

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PT2256V

Electronic Volume Controller IC

Princeton Technology 

Tel:886-2-66296288

Fax:886-2-29174598

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

Electronic Volume Controller IC

PT2256V

INITIALIZATION WHEN POWER ON

PT2256V 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

VDD

VIL

/RST

0V

T≥1ms

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

VD D 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 T225 6V

VSS

V SS

Notes:

1. If the VDD drops from 11V 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.

PT2256V V1.2

-6-

August, 2006

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