PT2248 查看數據表（PDF） - Princeton Technology

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PT2248

Infrared Remote Control Transmitter

Princeton Technology 

Tel: 886-2-66296288

Fax: 886-2-29174598

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

Infrared Remote Control Transmitter

PT2248

FUNCTION DESCRIPTION

OSCILLATION CIRCUIT

When the self-bias type amplifier is housed by CMOS inverter method, the oscillation circuit can be

constructed when a ceramic resonator has been connected.

Rf

2

C1

3

C2

Ceram ic Reson ator

45 5K Hz

C1, C2 = 120pF~150pF

When the oscillation frequency is set at 455KHz, the carrier wave of the transmitting signal is set at

38KHz. Unless the keys are being operated, the oscillation is normally stopped; thereby, reducing

power consumption.

KEY INPUT

18 Keys can be connected by Key Inputs K1 ~ K6 and timing signals T1 ~ T3.

Multiple Keying (maximum of 6 keys) is possible for the keys connected to T1 line (Output becomes

continuous pulses).

The order of priority of the timing signal line is T1, T2, and T3. When 2 or more keys that are connected

to T2 (or T3) line are pressed simultaneously, the single output will have the preferential order of K1 ~

K6.

Furthermore, the keys connected to T2 and T3 lines are for single signals and no second signal is

transmitted unless input is made after the key is released once.

PT2248 V2.7

-4-

June, 2005

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