PT2268 데이터 시트보기 (PDF) - Princeton Technology

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PT2268

Remote Control Encoder

Princeton Technology 

Remote Control Encoder

Tel: 886-2-66296288

Fax: 886-2-29174598

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

PT2268

FUNCTION DESCRIPTION

KEY INPUT

Up to eight (8) keys can be directly connected to pins I1 ~ I8. Please refer to the diagram below.

VCC

I1

I2

I3

I4 PT2268

I5

I6

I7

I8

Furthermore, PT2268 has a built-in pull-low resistor of about 60K ~ 110KΩ which reduces the need for

external components.

OSCILLATOR

An oscillation circuit can be constructed using the CMOS Inverter and Built-in Feedback Resistor,

455KHz Crystal and two 220pF capacitors. The carrier frequency is 38KHz.

P T 2268

OSC1

OSC2

2 20 p F

4 55 K Hz

2 20 p F

Unless any of the 8 keys (I1 ~ I8) is being operated, the oscillation is automatically stopped. Thus,

power consumption is considerably reduced.

PT2268 V2.5

-4-

April, 2006

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