Sharp R-310B Service Manual page 17

LSI(IZA882DR)
The I/O signal of the LSI(IZA882DR) are detailed in the following table.
Pin No. Signal
1 RST
2 INT
3 AVSS
4 VREF
5 K0
6 K1
7 AVDD
8 NC
9 S0
10 S1
11 S2
12 S3
13-14 NC
15 D0
16 D1
17 CNVS
18 VSS
19 D2
20 D3
21 D4
22 D5
DESCRIPTION OF LSI
I/O
IN Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily
set to "L" level the moment power is applied, at this time the LSI is reset. Thereafter
set at "H" level.
IN Signal coming from encoder.
When the encoder is turned, the contacts of encoder make pulse signals. And
pulse signals are input into INT.
IN A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI. Connected to VC.
IN Reference voltage input terminal.
A reference voltage is applied to the A/D converter in the LSI.
IN Signal coming from potentiometer.
By inputting DC voltage corresponding to the power level set by the potentiometer,
this input is converted into the power level by the A/D converter built into the LSI.
IN Terminal to change functions according to the model.
Signal in accordance with the model in operation is applied to set up its function.
IN A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI.
No connection terminal.
OUT Digit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD19 - LD24).
OUT Digit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD13 - LD18).
OUT Digit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD7 - LD12).
OUT Digit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD1 - LD6).
No connection terminal.
OUT Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD1, LD7, LD13 and
LD19).
OUT Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD2, LD8, LD14 and
LD20).
IN Reference voltage input terminal.
A reference voltage is applied to the A/D converter in the LSI. Connected to VC.
IN Power source voltage: -5V.
The power source voltage to drive the LSI is input to VSS terminal. Connected to
VC.
OUT Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD3, LD9, LD15 and
LD21).
OUT Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD4, LD10, LD16 and
LD22).
OUT Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD5, LD11, LD17 and
LD23).
OUT Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD6, LD12, LD18 and
LD24).
Description
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R-310B