R -3A53
R-3A53B
DESCRIPTION OF LSI
LSl(lZA377DR)
The I/O signals of the LSl(lZA377DR) are detailed in the following table.
PIN NO. / 1
Signal to sound buzzer.
SIGNAL / T
I
I/O
1 OUT
A: Key touch sound (0.12 sec.).
B: Completion sound (2.4 sec.).
PIN NO. / 2 1 SIGNAL /
VDD
I
I/O
IN
_-_---_
Power source voltage: -12V
VDD voltage of power source circuit input.
I
PIN NO. / 3 SIGNAL
/ VREF
I
I/O
IN
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. The reference voltage is generally maintained at -6.15V
PIN NO.
j 4
1 SIGNAL 1 VP
I
I/O
___-
/ IN
Anode (segment) of Fluorescent Displav illumination voltage: -26V
Vp voltage of power source circuit input.
PIN NO. / 5 SIGNAL / INT
I
I/O
/ IN
Signal svnchronized with commercial source frequencv(50Hz).
This is the basic timing for time processing of LSI.
PIN NO. 1 6 1 SIGNAL 1 CNVSS
Power source voltage input terminal.
Connected to GND.
I
I/O
1 IN
PIN NO. / 7-10 1 SIGNAL / FO-F3
I
I/O
~-
1 OUT
Segment data sionals.
Refer to the touch control panel circuit for the relationship between signals and indicators.
Normally, one pulse is output in every synchronized signal period, and input to the anode of the fluorescent display.
PIN NO. 11
1 SIGNAL / SO
I
l/O
1 OUT
Segment data signal.
Signal similar to FO.
Kev strobe siqnal.
Signal applied to touch-key section.
A pulse signal is input to K4-K7 terminal while one of D-8 line keys on key matrix is touched,
Terminal not used.
PIN NO. j 12
Segment data signal.
Signal similar to FO.
Key strobe signal.
SIGNAL / Sl
I
I/O
) OUT
Signal applied to touch-key section.
A pulse signal is input to K4-K7 terminal while one of D-7 line keys on key matrix is touched.
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