TC826 TelCom Semiconductor, TC826 Datasheet - Page 11

• Manufacturer Part Number: TC826
• Description: A/D CONVERTER WITH BAR GRAPH DISPLAY OUTPUT
• Manufacturer: TelCom Semiconductor

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