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TC818 데이터시트(PDF) 11 Page - Microchip Technology

부품명 TC818
상세설명  Auto-Ranging Analog-to-Digital Converter with 3-1/2 Digit Display
PDF  24 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC818 데이터시트(HTML) 11 Page - Microchip Technology

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© 2002 Microchip Technology Inc.
DS21475B-page 11
TC818A
FIGURE 3-4:
BASIC TC818A CONVERSION TIMING
3.9
Manual Range Selection
The TC818A voltage and resistance auto-ranging fea-
ture can be disabled by momentarily bringing RANGE
(Pin 59) to digital ground potential (Pin 58). When the
change from auto-to-manual ranging occurs, the first
manual range selected is the last range in the Auto-
Ranging mode.
The TC818A power-up circuit initially selects auto-
range operation. Once the manual range option is
entered, range changes are made by momentarily
grounding the RANGE control input. The TC818A
remains in the Manual Range mode until the measure-
ment function (voltage or resistance), or measurement
option (AC/DC,
Ω/LOΩ) changes. This causes the
TC818A to return to auto-ranging operation.
The “Auto” LCD annunciator driver is active only in the
Auto-Range mode.
Figure 3-5 shows typical operation where the manual
range selection option is used. Also shown is the
extended resolution display format. Also, see Figure 3-6
and Figure 3-7.
FIGURE 3-5:
MANUAL RANGE
SELECTION RESISTANCE
MEASUREMENTS
TC818A
Signal
INT
Phase
REF
DEINT
Phase
Auto-Zero
Phase
Min. Auto-Zero
Time
Fixed
1638.5tP
Next Conversion
Auto-Zero Cycle
Extended Resolution
Zero Crossing
*In Auto-Range Operation, Maximum
is 2000tP and minimum Auto-Zero Time is 4361.5tP
3361.5tP
*Max.
3000tP
tCONV = 8000tP
tDE
tI
To
Input
Signal
µ
External Crystal = 32.768kHz
Internal Clock Period = tP = 2/32.768 = 61.04µsec
Total Conversion Time = tCONV = 8000(tP)
= 488.3msec
≈ 2 conv/sec
Integration Time = TI = 1638.5(tP) = 100msec
Maximum Reference De-integrate Time
= tDE 3000(tP) = 183.1msec
(manual extended resolution)
= 2000(tP) = 122.1msec (auto-range)
Maximum Auto-Zero Time
= (8000 - 3000 - 1638.5)
(tP) = 205.1msec (manual extended resolution)
= (8000 - 3000 - 1638.5)
(tP) = 205.1msec (manual extended resolution)
Is
RX < 19
?
Is
RX > 3000
?
No
Is
RX > 2000
?
Continuity
Indicator
Continuous
4kHz Buzzer
No
No
Yes
Extended Resolution
Feature
Yes*
Display
True
Reading
*Mode also operates when Auto-Ranging Operator is selected
and 2M
Ω < RX < 2.999MΩ.
Yes
Display
"1" 000
Display Last
3 Digits and
Flash MSD
Over Range
Indicator
"1" = > Flashing
MSD
Manual
Range
Select
Output 4kHz
Audio
Frequency



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