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| 型號： | S1C60L02 |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 0.08 MHz, MICROCONTROLLER, PQFP60 |
| 文件頁數(shù)： | 96/102頁 |
| 文件大?。?/td> | 674K |
| 代理商： | S1C60L02 |
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S1C60N02 TECHNICAL MANUAL
EPSON
85
APPENDIX: TECHNICAL INFORMATION
Appendix B Error Factors
When a temperature is computed using the S1C60N02 A/D con-
verter and the Thermistor, the following error factors should be
taken in account:
Thermistor resistance
dispersion
The Thermistor manufacturer should guarantee the precision.
A/D converter error
factors
Error (circuit) by A/D conversion in R1 (standard resistance)
and R2 (Thermistor)
By the CR oscillation at the standard resistor (R1), the up counter
and the up-down counter increment the counter with the timing
shown below.
Fig. B.1
ADRUN register
CS pin
ADOUT output
Up counter enable
Up counter (C0)
Clock (Up-down counter)
Up-down counter enable
Up-down counter (TC0)
Starts counting
After the A/D RUN, the first trailing edge of the CS pin triggers the
up counter enable. From the next trailing edge, the up counter
starts to count. In addition, the first trailing edge of the clock after
the up counter is enabled, the up-down counter is enabled and it
starts to count from the next trailing edge.
When the up counter value becomes 0, the up counter is disabled.
The next trailing edge of the clock disables the up-down counter.
If this situation occurs, the error described below will result.
Started:
Min.
≈ 0
Max. Up-down counter - 1 count
Total up-down counter
Stopped: Min
≈ 0
- 2 counts
Max. Up-down counter - 1 count
The same is true in the CR oscillation by Thermistor R2, and a
similar error occurs. Exception: because the up-down counter is
down-counted the following counting error occurs:
Started:
Min.
≈ 0
Max. Up-down counter - 1 count
Total up-down counter
Stopped: Min
≈ 0
- 2 counts
Max. Up-down counter - 1 count
Therefore, as for the error from the circuit, a maximum of 2 count
errors results.
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