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TC14433ELI Datasheet(PDF) 9 Page - Microchip Technology

Part # TC14433ELI
Description  3-1/2 Digit, Analog-to-Digital Converter
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC14433ELI Datasheet(HTML) 9 Page - Microchip Technology

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© 2002 Microchip Technology Inc.
DS21394B-page 9
TC14433/A
4.0
TYPICAL APPLICATIONS
The Typical Application circuit is an example of a 3-1/2
digit voltmeter using the TC14433 with Common-
anode displays. This system requires a 2.5V reference.
Full scale may be adjusted to 1.999V or 199.9 mV.
Input overrange is indicated by flashing a display. This
display uses LEDs with common anode digit lines.
Power supply for this system is shown as a dual ±5V
supply; however, the TC14433 will operate over a wide
voltage range
The circuit in Figure 4-1 shows a 3-1/2 digit LCD
voltmeter. The 14024B provides the low frequency
square wave signal drive to the LCD backplane. Dual
power supplies are shown here; however, one supply
maybeusedwhenVSS is connectedtoVEE.In this
case, VAG must be at least 2.8V above VEE.
When only segments b and c of the decoder are con-
nected to the 1/2 digit of the display, 4, 0, 7 and 3
appear as 1.
The overrange indication (Q3 = 0 and Q0 =1) occurs
when the count is greater than 1999; (e.g., 1.999V for
a reference of 2V) The underrange indication, useful for
auto-ranging circuits, occurs when the count is less
than 180; (e.g., 0.180V for a reference of 2V).
TABLE 4-1:
TRUTH TABLE
Figure 4-2 is an example of a 3-1/2 digit LED voltmeter
with a minimum of external components, (only 11
additional components). In this circuit, the 14511B
provides the segment drive and the 75492 or 1413
provides sink for digit current. Display is blanked during
the overrange condition.
Note:
If the most significant digit is connected to
a display other than a "1" only, such as a
full digit display, segments other than b
and c must be disconnected. The BCD to
7-segment decoder must blank on BCD
inputs 1010 to 1111. See Table 4-1
Coded
Condition
of MSD
Q
3
Q
2
Q
1
Q
0
BDC to 7-Segment
Decoding
+0
1110
Blank
Blank
Blank
Blank
-0
1010
+0 UR
1111
-0 UR
1011
+1
0100
4 – 1
0–1
7–1
3–1
Hook up
only segments
b and c to MSD
-1
0000
+1 OR
0111
-1 OR
0011
Note 1:
Q3 - 1/2 digit, low for "1", high for "0".
Q2 - Polarity: "1" = positive, "0" = negative.
Q0 - Out of range condition exists if Q0 =1.
When used in conjunction with Q3,the type of
out of range condition is indicated; i.e., Q3 =0 →
OR or Q3 =1 → UR.


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