PT2272-L3 データシートの表示（PDF） - Princeton Technology

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PT2272-L3

PT2272 / 2272-M2S / Remote Control Decoder / Available in DIP and SOP

Princeton Technology 

Tel: 886-2-66296288

Fax: 886-2-29174598

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

Remote Control Decoder

PT2272

VALID TRANSMISSION

When PT2272 receives a transmission code word, it initially checks whether this is a valid transmission.

For a transmission to be valid, (1) it must be a Complete Code Word, and (2) the Address Bits must

match the Address Setting at the Address Pins. After two consecutive valid transmissions, PT2272 (1)

drives the data pins according to the data bits received, and (2) raises VT to high voltage (high state).

The timings are shown in the following diagram.

Sync bit Sync bit

1st word 2nd word

DIN

Data pins

(momentary)

VT

ta

tc

tb

ta = 8 OSC clock width

tb = 1 OSC clock width

tc = 2 code word width

LATCH OR MOMENTARY DATA OUTPUT TYPE

PT2272 uses either the latch or the momentary data output type depending on the PT2272 version

used. The latch type (PT2272-Lx) activates the data out during transmission and this data is sustained

in the memory until another data is inputted or entered. A momentary type (PT2272-Mx), on the other

hand, activates the data out only during transmission. In the momentary type, the data does not remain

in the memory after the transmission is completed. Please refer to the diagram below:

DATA WORDS

DIN

DATA WORDS

DATA PINS

(Momentary)

T

DATA OUTP UT X

T

DATA OUTPUT Y

DATA PINS

( Lat ch)

DATA OUTP UT X

DATA OUTPUT Y

VT

PT2272 V3.7

T = 2 CODE WORDS WIDTH

- 10 -

June, 2008

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