TC826 Просмотр технического описания (PDF) - TelCom Semiconductor Inc => Microchip
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TC826 Datasheet PDF : 12 Pages
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A/D CONVERTER WITH
BAR GRAPH DISPLAY OUTPUT
1
TC826
8
9V
TC826
12
13
OSC1
14
OSC2
0.1µf
EXTERNAL
OSCILLATOR
A. SINGLE 9V SUPPLY
VDD 8
TC826
VSS 12
13
0. 1µf
OSCILLATOR
VDD = 5V
POWER
SUPPLY
B. DUAL SUPPLY
VSS = 5V
Figure 9. External Oscillator Connection
LCD Display Format
The input signal can be displayed in two formats
(Figure 10). The BAR/DOT input (Pin 61) selects the format.
The TC826 measurement cycle operates indentically for
either mode.
A. BAR MODE
1. INPUT = 0
BAR 4
BAR 3
BAR 2
BAR 1
BAR 0
OFF
OFF
OFF
OFF
ON
2. INPUT = 5%
OF FULL–SCALE
OFF
OFF
ON
ON
ON
B. DOT MODE
1. INPUT = 0
BAR 4
BAR 3
BAR 2
BAR 1
BAR 0
OFF
OFF
OFF
OFF
ON
2. INPUT = 5%
OF FULL–SCALE
OFF
OFF
ON
OFF
OFF
Figure 10. Display Option Formats
2
3
4
BAR Format
The TC826 power-ups in the BAR mode. BAR/DOT is
pulled high internally. This display format is similar to a
thermometer display. All bars/LCD segments, including
5 zero, below the bar/LCD segment equaling the input signal
level are on. A half-scale input signal, for example, would be
displayed with BAR 0 to BAR 20 on.
DOT Format
By connecting BAR/DOT to VSS through a 1MΩ resistor
the DOT mode is selected. Only the BAR LCD segment
6 equaling the input signal is on. The zero segment is on for
zero input.
This mode is useful for moving cursor or ‘needle’
applications.
7
TELCOM SEMICONDUCTOR, INC.
8
3-181
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