Sharp R-8320E, Service Manual

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Pin No.
Signal
Description
10
OUT Similar to
To indicate the first digit of Fluorescent Display.
11
OUT
Similar to
To indicate the second digit of Fluorescent Display.
12 OUT
Similar to
To indicate the third digit of Fluorescent Display.
13 OUT
Similar to
To indicate the fourth digit of Fluorescent Display.
14 IN Anode (segment) of Fluorescent Display light-up voltage: -25V.
Vp voltage of converter circuit is input.
15 RESET IN Auto-clear terminal.
Signal is input to reset the LSI to the initial slate when power is supplied.
Temporarily set to “H” level the moment power is supplied, in this time the LSI is
reset.
Thereafter set “L” level
16
VBB
17
VDD
18
IN
IN
IN
Power source voltage: -1 OV.
-10 volt of converter circuit is input.
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit
with respect to
terminal.
19
OUT Internal clock oscillation frequency control output.
Output to control oscillation input of
20 TEST
21
22
23
24
25
26
IN Terminal not used. Connected to GND.
IN
IN Input signal to be used for data supplying and reception with respect to LSI (l-l:
. output signal:
IN
IN
IN
OUT Signal for lighting of power level indicators.
Normally signal similar Vp.
Pulse signals are generated when lighting either indicator.
- 3 0 v
1
- 2 5 v
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