MC68HC16Z1CAG16 Datasheet, PDF (8/500 Pages) Freescale Semiconductor, Inc – M68HC16Z Series users manual

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Freescale Semiconductor, Inc.
TABLE OF CONTENTS
(Continued)
Title
Page
SECTION 8
ANALOG-TO-DIGITAL CONVERTER
8.1 General ......................................................................................................8-1
8.2 External Connections ................................................................................8-1
8.2.1
Analog Input Pins ..............................................................................8-2
8.2.2
Analog Reference Pins ......................................................................8-3
8.2.3
Analog Supply Pins ...........................................................................8-3
8.3 Programmer’s Model .................................................................................8-3
8.4 ADC Bus Interface Unit .............................................................................8-3
8.5 Special Operating Modes ..........................................................................8-3
8.5.1
Low-Power Stop Mode ......................................................................8-3
8.5.2
Freeze Mode .....................................................................................8-4
8.6 Analog Subsystem ....................................................................................8-4
8.6.1
Multiplexer .........................................................................................8-4
8.6.2
Sample Capacitor and Buffer Amplifier .............................................8-5
8.6.3
RC DAC Array ...................................................................................8-5
8.6.4
Comparator .......................................................................................8-6
8.7 Digital Control Subsystem .........................................................................8-6
8.7.1
Control/Status Registers ...................................................................8-6
8.7.2
Clock and Prescaler Control ..............................................................8-6
8.7.3
Sample Time .....................................................................................8-7
8.7.4
Resolution .........................................................................................8-7
8.7.5
Conversion Control Logic ..................................................................8-7
8.7.5.1
Conversion Parameters ............................................................8-8
8.7.5.2
Conversion Modes ....................................................................8-8
8.7.6
Conversion Timing ..........................................................................8-12
8.7.7
Successive Approximation Register ................................................8-13
8.7.8
Result Registers ..............................................................................8-13
8.8 Pin Considerations ..................................................................................8-14
8.8.1
Analog Reference Pins ....................................................................8-14
8.8.2
Analog Power Pins ..........................................................................8-14
8.8.3
Analog Supply Filtering and Grounding ...........................................8-16
8.8.4
Accommodating Positive/Negative Stress Conditions .....................8-18
8.8.5
Analog Input Considerations ...........................................................8-19
8.8.6
Analog Input Pins ............................................................................8-21
8.8.6.1
Settling Time for the External Circuit .......................................8-22
8.8.6.2
Error Resulting from Leakage .................................................8-23
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M68HC16 Z SERIES
USER’S MANUAL