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HC705JJ7GRS/D 数据表(PDF) 132 Page - NXP Semiconductors |
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HC705JJ7GRS/D 数据表(HTML) 132 Page - NXP Semiconductors |
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132 / 230 page  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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