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68HC705SP7 데이터시트(PDF) 132 Page - Freescale Semiconductor, Inc

부품명 68HC705SP7
상세설명  General Release Specification
PDF  230 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

68HC705SP7 데이터시트(HTML) 132 Page - Freescale Semiconductor, Inc

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Analog Subsystem
General Release Specification
MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0
Analog Subsystem
Table 8-7. Ratiometric Voltage Reading Errors
Error Source
Accuracy Improvements Possible
In Hardware
In Software
Change in reference
voltage
Not required for ratiometric
Compare unknown with recent
measurement from reference
Change in magnitude of
ramp current source
Not adjustable
Compare unknown with recent
measurement from reference
Non-linearity of ramp
current source vs. voltage
Not adjustable
Calibration and storage of voltages at
1/4, 1/2, 3/4, and FS
Change in magnitude of
ramp capacitor
Not required for ratiometric
Compare unknown with recent
measurement from reference
Frequency shift in internal
low-power oscillator
Not required for ratiometric
Compare unknown with recent
measurement from reference
Frequency shift in external
oscillator
Not required for ratiometric
Compare unknown with recent
measurement from reference
Sampling capacitor leakage Use faster conversion times
Compare unknown with recent
measurement from reference
Internal voltage divider ratio Not adjustable
Compare unknown with recent
measurement from reference
Input offset voltage of
comparator 2
Not adjustable
Sum two readings on reference or
unknown using INV and INV control bit
and divide by 2 (average of both)
Noise internal to MCU
Close decoupling at VDD and VSS pins
and reduce supply source impedance
Average multiple readings on both the
reference and the unknown voltage
Noise external to MCU
Close decoupling of power supply, low
source impedances, good board
layout, use of multi-layer board
Average multiple readings on both the
reference and the unknown voltage
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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