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MC908QY4A Datasheet(PDF) 37 Page - Freescale Semiconductor, Inc |
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MC908QY4A Datasheet(HTML) 37 Page - Freescale Semiconductor, Inc |
37 / 200 page MC68HC908QYA/QTA Family Data Sheet, Rev. 2 Freescale Semiconductor 37 Chapter 3 Analog-to-Digital Converter (ADC10) Module 3.1 Introduction This section describes the 10-bit successive approximation analog-to-digital converter (ADC10). The ADC10 module shares its pins with general-purpose input/output (I/O) port pins. See Figure 3-1 for port location of these shared pins. The ADC10 on this MCU uses VDD and VSS as its supply and reference pins. This MCU uses BUSCLKX4 as its alternate clock source for the ADC. This MCU does not have a hardware conversion trigger. 3.2 Features Features of the ADC10 module include: • Linear successive approximation algorithm with 10-bit resolution • Output formatted in 10- or 8-bit right-justified format • Single or continuous conversion (automatic power-down in single conversion mode) • Configurable sample time and conversion speed (to save power) • Conversion complete flag and interrupt • Input clock selectable from up to three sources • Operation in wait and stop modes for lower noise operation • Selectable asynchronous hardware conversion trigger 3.3 Functional Description The ADC10 uses successive approximation to convert the input sample taken from ADVIN to a digital representation. The approximation is taken and then rounded to the nearest 10- or 8-bit value to provide greater accuracy and to provide a more robust mechanism for achieving the ideal code-transition voltage. Figure 3-2 shows a block diagram of the ADC10 For proper conversion, the voltage on ADVIN must fall between VREFH and VREFL. If ADVIN is equal to or exceeds VREFH, the converter circuit converts the signal to $3FF for a 10-bit representation or $FF for a 8-bit representation. If ADVIN is equal to or less than VREFL, the converter circuit converts it to $000. Input voltages between VREFH and VREFL are straight-line linear conversions. NOTE Input voltage must not exceed the analog supply voltages. |
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