Схема электрическая принципиальная весов DS-682 (DIGI)
TECHNICAL DETAIL & ELECTRICAL DIAGRAM
Technical Detail & Electrical Diagram
Hardware Description
Microcomputer
The uPD75P3018/uPD75P3018A series Microcomputer was chosen for the following reasons:
* Cheaper.
Low operating current.
Having an on-chip programmable LCD controller/driver.
Eight interrupt sources and efficient interrupt processing.
* Five versatile timers.
* Less chip count.
Pin compatibility of similar package with difference ROM sizes.
Small package (80-pin plastic QFP, 14 x 14 mm).
Good support.
Pin Assignment
Pin | I/O | Assignment | Device | Remark |
P00/INT4 | ||||
P01/SCK | O | SCK | 93C46P | EEPROM |
P02/SO | O | S0 | 93C46P | EEPROM |
P03/SI | I | SI | 93C46P | EEPROM |
P10/INT0 | I | SPANSW | SWITCH | Span Enable/Disable |
P11/INT1 | I | A/D INT | uPC4062 | A/D Conversion Interrupt |
P12/INT2 | I | BATT T1 | uPC393C | Detects battery Voltage Level 1 |
P13/TI0 | I | BATT T2 | uPC393C | Detects battery Voltage Level 2 |
P20/PTO0 | O | A/D PA | 74HC4066 | A/D Conversion Control |
P21 | O | A/D PZ | 74HC4066 | A/D Conversion Control |
P22/PCL | O | A/D P- | 74HC4066 | A/D Conversion Control |
P23/BUZ | O | A/D P+ | 74HC4066 | A/D Conversion Control |
P30 | O | CS | 93C46P | EEPROM |
P31 | O | P-ON/OFF | Power Switch | DC Main Power |
P32 | O | BUZZ | Buzzer | Buzzer Sounder |
P33 | O | P-EL | Power Switch | Back-Light power |
P40 | O | T1 | Keyboard | Key Scanning Line |
P41 | O | T2 | Keyboard | Key Scanning Line |
P42 | O | T3 | Keyboard | Key Scanning Line |
P43 | O | T4 | Keyboard | Key Scanning Line |
P50 |
Pin | I/O | Assignment | Device | Remark |
P51 | ||||
P52 | ||||
P53 | ||||
P60/KR0 | I | K1 | Keyboard | Key Return Line |
P61/KR1 | I | K2 | Keyboard | Key Return Line |
P62/KR2 | I | K3 | Keyboard | Key Return Line |
P63/KR3 | I | K4 | Keyboard | Key Return Line |
P70/KR4 | I | K5 | Keyboard | Key Return Line |
P71/KR5 | ||||
P72/KR6 | ||||
P73/KR7 | ||||
S0 | O | SEGMENT 0 | LCD | Segment Signal Output |
S1 | O | SEGMENT 1 | LCD | Segment Signal Output |
S2 | O | SEGMENT 2 | LCD | Segment Signal Output |
Pin | I/O | Assignment | Device | Remark |
S3 | O | SEGMENT 3 | LCD | Segment Signal Output |
S4 | O | SEGMENT 4 | LCD | Segment Signal Output |
S5 | O | SEGMENT 5 | LCD | Segment Signal Output |
S6 | O | SEGMENT 6 | LCD | Segment Signal Output |
S7 | O | SEGMENT 7 | LCD | Segment Signal Output |
S8 | O | SEGMENT 8 | LCD | Segment Signal Output |
S9 | O | SEGMENT 9 | LCD | Segment Signal Output |
S10 | O | SEGMENT 10 | LCD | Segment Signal Output |
S11 | O | SEGMENT 11 | LCD | Segment Signal Output |
S12 | O | SEGMENT 12 | LCD | Segment Signal Output |
S13 | O | SEGMENT 13 | LCD | Segment Signal Output |
S14 | O | SEGMENT 14 | LCD | Segment Signal Output |
S15 | O | SEGMENT 15 | LCD | Segment Signal Output |
S16 | O | SEGMENT 16 | LCD | Segment Signal Output |
S17 | O | SEGMENT 17 | LCD | Segment Signal Output |
S18 | O | SEGMENT 18 | LCD | Segment Signal Output |
S19 | O | SEGMENT 19 | LCD | Segment Signal Output |
S20 | O | SEGMENT 20 | LCD | Segment Signal Output |
Pin | I/O | Assignment | Device | Remark |
S21 | O | SEGMENT 21 | LCD | Segment Signal Output |
S22 | O | SEGMENT 22 | LCD | Segment Signal Output |
S23 | O | SEGMENT 23 | LCD | Segment Signal Output |
BP0/S24 | O | SEGMENT 24 | LCD | Segment Signal Output |
BP1/S25 | O | SEGMENT 25 | LCD | Segment Signal Output |
BP2/S26 | O | SEGMENT 26 | LCD | Segment Signal Output |
BP3/S27 | O | SEGMENT 27 | LCD | Segment Signal Output |
BP4/S28 | O | SEGMENT 28 | LCD | Segment Signal Output |
BP5/S29 | O | SEGMENT 29 | LCD | Segment Signal Output |
BP6/S30 | O | SEGMENT 30 | LCD | Segment Signal Output |
BP7/S31 | O | SEGMENT 31 | LCD | Segment Signal Output |
| COM0 | O | COMMON 0 | LCD | Common Signal Output |
| COM1 | O | COMMON 1 | LCD | Common Signal Output |
| COM2 | O | COMMON 2 | LCD | Common Signal Output |
| COM3 | O | COMMON 3 | LCD | Common Signal Output |
| BIAS | O | BIAS | - | LCD Drive Power Supply |
| VLC0 | - | VLC0 | - | LCD Drive Power Pin |
| VLC1 | - | VLC1 | - | LCD Drive Power Pin |
| VLC2 | - | VLC2 | - | LCD Drive Power Pin |
RESET | I | RESET | - | SYSTEM RESET |
X1 | I | - | Oscillator | 4.19 MHz Crystal |
X2 | I | - | Oscillator | 4.19 MHz Crystal |
XT1 | I | - | - | Connect To The VSS Pin |
XT2 | ||||
| VSS | - | - | - | Grounding Potential Pin |
| VDD | - | - | - | Positive Power Pin (5V) |
NC/VPP | - | - | - | Connect To The VDD Pin |
Block Diagram
CN12P
Physical layout of Electrical Connection
Circuitry Diagram
Please find the attached diagrams.
Circuitry Diagram Cover page
DS-682 MAIN BOARD-A/D
DS-682 MAIN BOARD AC/DC
DS-682 MAIN BOARD -POWER
DS-682 MAIN BOARD - CPU
DS-682 DISPLAY BOARD
DS-682 KEY-LAYOUT
