M68HC16Z 데이터 시트보기 (PDF) - Freescale Semiconductor

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M68HC16Z

M68HC16Z Series

Freescale Semiconductor 

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Freescale Semiconductor, Inc.

TABLE OF CONTENTS

(Continued)

Title

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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

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