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TC818 Datasheet(PDF) 12 Page - Microchip Technology

Part # TC818
Description  Auto-Ranging Analog-to-Digital Converter with 3-1/2 Digit Display
PDF  24 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC818 Datasheet(HTML) 12 Page - Microchip Technology

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TC818A
DS21475B-page 12
© 2002 Microchip Technology Inc.
FIGURE 3-6:
MANUAL RANGE
SELECTION CURRENT
MEASUREMENTS
3.10
Extended Resolution Manual
Operation
When operated in the Manual Range mode, the
TC818A extends resolution by 50% for current, volt-
age,
and
resistance
measurements.
Resolution
increases to 3000 counts from 2000 counts. The
extended resolution feature operates only in the
2000k
Ω and 2000V ranges during auto-range
operation.
In the Extended Resolution Operating mode, readings
above 1999 are displayed with a blinking “1” most sig-
nificant digit. The blinking “1” should be interpreted as
the digit 2. The three least significant digits display data
normally. The bar graph LCD will be fully extended.
An input over range condition causes the most signifi-
cant digit (MSD) to blink and sets the three least signif-
icant digits (LSDs) to display “000.” The buzzer output
is enabled for input voltage and current signals with
readings greater than 2000 counts in both manual and
auto-range operations.
For resistance measurements, the buzzer signal does
not indicate an over range condition. The buzzer is
used to indicate continuity. Continuity is defined as a
resistance reading less than 19 counts.
FIGURE 3-7:
MANUAL RANGE
SELECTION VOLTAGE
MEASUREMENTS
Range
Select
Is
IX > 3000
?
Is
IX > 2000
?
Display
"1" 000
Over Range
Indicator
"1" = > Flashing
MSD
No
No
Yes
Display Last
3 Digits and
Flash MSD
Display
True
Reading
Yes
Output 4kHz
Audio
Frequency
Noncontinuous
Yes
Is
VX > 3000
?
No
No
Yes
Yes
Extended
Resolution
Feature
Is
VX > 2000
?
Range
Select
Output 4kHz
Audio
Frequency
Noncontinuous
Over Range
Indicator
Display
"1" 000
"1" = > Flashing
MSD
Display Last
3 Digits and
Flash MSD
Display
True
Reading



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