AN887 Datasheet, PDF (8/12 Pages) STMicroelectronics – MICROCONTROLLERS MADE EASY

MICROCONTROLLERS MADE EASY
Figure 12. Mixed A/D System Example
ANALOG
DATA
A/D
CONVERTER
DIGITAL
DATA
PROCESSING
D/A
CONVERTER
ANALOG
DATA
THERMOMETER
FAN
VR02101K
Analog to digital conversion (A / D). Converts an external analog signal (typically relative to
voltage) and converts it to a digital representation. Microcontrollers that have this feature can
be used for instrumentation, environmental data logging, or any application that lives in an an-
alog world. Various types of A/D converters that can be found.
Comparator. One or more standard comparators can sometimes be placed on a microcon-
troller die. These comparators operate much like standard comparators however the input and
output signals are available on the microcontroller bus.
Digital to analog conversion (D/A). This feature takes a Digital number and converts it to a
analog output. The number 50 would be changed to the analog output of (50 / 256 * 5 Volts)
= .9765625 V on a 8 bit / 5 Volt system.
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