Sharp R-212 Service Manual download pdf (Page 17)

R-212B

DESCRIPTION OF LSI

LSI(IZA882DR)

The I/O signal of the LSI(IZA882DR) are detailed in the following table.

Pin No. Signal I/O Description

1 RST 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.

2 INT IN Signal coming from encoder.

When the encoder is turned, the contacts of encoder make pulse signals. And

pulse signals are input into INT.

3 AVSS IN A/D converter power source voltage.

The power source voltage to drive the A/D converter in the LSI. Connected to VC.

4 VREF IN Reference voltage input terminal.

A reference voltage is applied to the A/D converter in the LSI.

5K0INSignal 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.

6K1INTerminal to change functions according to the model.

Signal in accordance with the model in operation is applied to set up its function.

7 AVDD IN A/D converter power source voltage.

The power source voltage to drive the A/D converter in the LSI.

8 NC No connection terminal.

9 S0 OUT Digit selection signal.

Signal is input to the anodes of the light-emitting diodes (LD19 - LD24).

10 S1 OUT Digit selection signal.

Signal is input to the anodes of the light-emitting diodes (LD13 - LD18).

11 S2 OUT Digit selection signal.

Signal is input to the anodes of the light-emitting diodes (LD7 - LD12).

12 S3 OUT Digit selection signal.

Signal is input to the anodes of the light-emitting diodes (LD1 - LD6).

13-14 NC No connection terminal.

15 D0 OUT Segment data signal.

Signal is input to the cathodes of the light-emitting diodes (LD1, LD7, LD13 and

LD19).

16 D1 OUT Segment data signal.

Signal is input to the cathodes of the light-emitting diodes (LD2, LD8, LD14 and

LD20).

17 CNVS IN Reference voltage input terminal.

A reference voltage is applied to the A/D converter in the LSI. Connected to VC.

18 VSS IN Power source voltage: -5V.

The power source voltage to drive the LSI is input to VSS terminal. Connected to

VC.

19 D2 OUT Segment data signal.

Signal is input to the cathodes of the light-emitting diodes (LD3, LD9, LD15 and

LD21).

20 D3 OUT Segment data signal.

Signal is input to the cathodes of the light-emitting diodes (LD4, LD10, LD16 and

LD22).

21 D4 OUT Segment data signal.

Signal is input to the cathodes of the light-emitting diodes (LD5, LD11, LD17 and

LD23).

22 D5 OUT Segment data signal.

Signal is input to the cathodes of the light-emitting diodes (LD6, LD12, LD18 and

LD24).

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 35 36

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Sharp R-212 Service Manual Page 17

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