Table of Contents
Advertisement
1/0
Function and Operation
Output]
''H" level when tuner is ON.
Output]
"H"" output pin when tuner is switched on and off independently.
Output
Output
Output
—| > Key input strobe output pins. Active "H"'.
Output! | (06 is not used
FX-K9B/EW, FX-K9/EW)
Key input strobe output pin. Active "H".
Key input strobe output pin. Active ""H''.
GND
Counter clock input pin (32.768kHz)
Power supply pin.
X'tal connection pin.
36~39|
VRO~VR3
Volume data output pins. Active ''H''.
41~ 44)
R
ac
ae
R3
Input
| Key input return input pins.
46.
aa
VR4.,
VRS
Output}
Volume data output pins. Active ""H''.
Output}
PD7005 chip selector signal output pin. Active "L"'.
49
BUZZER
Output|
Buzzer drive clock output pin. 3.8kHz
Input | Accessory key ON/OFF input pin. ""H" when ON.
50
ACC
| si | aux
|
Input | AUX ON/OFF input pin. ON when "H",
Input | 12/24 hour display switching input pin. 12-hour when "L".
*Check the following items to determine whether PD4050B
is operating or not.
1. Approximately 5V should be applied to pins 7 and 33.
4. An oscillator output of about 200kHz should be applied
2. Pin 3 should be at ""L"', but not connected to GND. 5V
to pin 9.
should be applied to pin 3 when the CLEAR
button is
5. The following output waveforms should be observed at
pressed.
the respective pins (data transmission).
3. Approximately 5V should be applied to pin 50.
Pin 12, 16
Pin 15
rr
—
LLL
ov
ov
(Matrix Circuit)
Pin 21,22.24~ 26.28.30
5ve—
|
]
|
|
|
Ov
46
Advertisement
Table of Contents
