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AN780 Datasheet(PDF) 7 Page - Microchip Technology

Part # AN780
Description  15-Kilogram Scale Using the TC500A and the TC520
PDF  10 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

AN780 Datasheet(HTML) 7 Page - Microchip Technology

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DS00780A-page 7
© 2002 Microchip Technology, Inc.
AN780
Start
Read Conversion Results from TC520
Yes
Setup
Conversion
Complete
?
Save Results as Offset Value
15 Times
?
Conversion
Complete
?
Subtract Offset Value
Delta = This Reading - Saved Reading
Delta >
2 Grams
?
Restore Register
Save This Reading
Divide by 8
Pounds
?
Convert Binary to BCD
Display
No
Yes
No
No
Yes
Add Delta
to Register
Register
Overflow
?
Retrieve Saved Reading
Multiply by 22046
Yes
Yes
No
Yes
No
Read Conversion Results from TC520
FIGURE 6: TC520 program flow chart.
FIGURE 7: PIC16C62A program flow chart.
Power
Output
A = 0
B = 0
Zero Integrate
Comparator
?
Output
A = 0
B = 1
Low
Auto Zero
High
Stop
Counter
Latch Count
Overrange
Polarity
Clear
Count
Overrrange
Start
Timer
Timer
Overflow
?
Yes
Output
A = 1
B = 0
Start
Timer
Timer
Overflow
?
No
No
Output
A = 1
B = 1
Deintegrate
Start
Counter
Yes
Comparator
?
Counter
Overflow
?
Set Overrange Bit
Low
No
Yes
High
Integrate
Reset Polarity Bit
Comparator
?
Set Polarity Bit
Low
High



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