PT2212 查看數據表（PDF） - Princeton Technology

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PT2212

Infrared Remote Control Transmitter

Princeton Technology 

Tel: 886-2-66296288

Fax: 886-2-29174598

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

Infrared Remote Control Transmitter

PT2212

FUNCTION DESCRIPTION

TRANSMISSION CODE FORMAT

The PT2212 transmission code is composed a leader code, system code, and the data code. There

are 8-bit of system code (S0 to S7) and this 8-bit system code is outputted twice. Likewise, there are

8-bit of data code (D0 to D7), and the inversion data code is also transmitted. Please refer to the

diagram below for details.

The leader code is composed of a 4.5ms “High” and 4.5ms “Low”. The system code and the data code

are transmitted via a P.P.M. (Pulse Position Modulation) Method. With the system codes transmitted

twice and the data code sent with its inversion code, simultaneously, highly efficient operations can be

constructed.

The Bit “0” and “1” waveforms are given below:

Note: r=Tm, Tm=256/fosc=0.56ms

The leader code and the first bit of the inverted system code (S0) are transmitted when the key is

continuously pressed, thus reduction of the reception treating time and the power dissipation of the

infrared LED is possible. At this point, the leader code become very dominant that the average current

flow towards the infrared LED is reduced to 1.8% of the peak value leading to a highly efficient

transmission.

PT2212 V1.1

-4-

May, 2007

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