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參數資料
型號: MC44107P
廠商: MOTOROLA INC
元件分類: 搖控器
英文描述: IR Remote Control Transmitter
中文描述: INFRARED, TRANSMITTER IC, PDIP20
封裝: PLASTIC, DIP-20
文件頁數: 6/8頁
文件大小: 168K
代理商: MC44107P
MC44107
6
MOTOROLA
PIN DESCRIPTIONS
ROW INPUTS
1 to 8 ( Pins 1, 2, 3, and 5 – 9) In the standby mode these
inputs are held high by internal pull–up resistors. As soon as
a key is pressed, a logical “0” is presented by the column out-
put on that particular line. This switches the circuit to the ac-
tive mode and starts the oscillator.
COLUMN OUTPUTS
B to H (Pins 12 – 16, 18, and 19) In the standby mode
these pins are held low, logical “0”. When a key is selected
and the oscillator starts, the outputs are released and the
scanning routine starts.
PAGE INPUT
(Pin 11) This input is connected directly to the transmitter’s
supervisory and control circuitry and may be connected to
one of the column outputs, via a key, or left open. If the pin is
left open, the first page of 64 commands will be available
(see Table 1). If connected to one of the column outputs, the
remaining pages become available (see Table 2). The speci-
fied standby current consumption is maintained regardless of
the load applied to the input: 0 V < V page < VDD.
OSCILLATOR
(Pin 17) A one–pin oscillator is incorporated into the circuit,
which has been specifically designed for use with an inex-
pensive ceramic resonator between 430 kHz and 530 kHz. It
is possible to use a tuned LC circuit with a series capacitor, in
place of the ceramic resonator.
DATA OUTPUT
(Pin 4) This output provides the modulated signal for sub-
sequent external amplification.
SPECIAL NOTE: KEYBOARD
It is important, when considering a keyboard, that the max-
imum “ON” resistance, even after aging, of 500
is strictly
observed.
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