參數(shù)資料
型號: HC805P18GRS
英文描述: 68HC805P18 Technical Data
中文描述: 68HC805P18技術(shù)數(shù)據(jù)
文件頁數(shù): 57/111頁
文件大?。?/td> 748K
代理商: HC805P18GRS
GENERAL RELEASE SPECIFICATION
MC68HC805P18
Rev. 1.0
ANALOG-TO-DIGITAL CONVERTER
MOTOROLA
9-1
8
2
3
4
5
6
7
8
9
10
11
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A
16
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SECTION 9
ANALOG-TO-DIGITAL CONVERTER
9.1 Introduction
The MC68HC805P18 includes a 4-channel, multiplexed input, 8-bit successive
approximation analog-to-digital (A/D) converter. The A/D subsystem shares its
inputs with port C pins PC3 through PC7.
9.2 Analog Section
The following paragraphs describe the operation and performance of analog
modules within the analog subsystem.
9.2.1 Ratiometric Conversion
The A/D converter is ratiometric, with pin V
REFH
supplying the high reference
voltage. Applying an input voltage equal to V
REFH
produces a conversion result of
$FF (full scale). Applying an input voltage equal to V
SS
produces a conversion
result of $00. An input voltage greater than V
REFH
will convert to $FF with no
overflow indication. For ratiometric conversions, V
REFH
should be at the same
potential as the supply voltage being used by the analog signal being measured
and referenced to V
SS
.
9.2.2 V
REFH
The reference supply for the A/D converter shares pin PC7 with port C. The low
reference is tied to the V
SS
pin internally. V
REFH
can be any voltage between V
SS
and V
DD
; however, the accuracy of conversions is tested and guaranteed only for
V
REFH
= V
DD
.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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