參數(shù)資料
型號(hào)： TC820CPL
元件分類： ADC
英文描述： 1-CH DUAL-SLOPE ADC, PDIP40
封裝： PLASTIC, DIP-40
文件頁(yè)數(shù)： 14/28頁(yè)
文件大?。?/td> 616K
代理商： TC820CPL
2002 Microchip Technology Inc.
DS21476B-page 21
TC820
5.11
External Peak Detection
The TC820 will hold the highest A/D conversion or fre-
quency reading indefinitely when the PKHOLD input is
connected to VDD. However, the analog peak input
must be present during the A/D converter's signal inte-
grate period. For slowly changing signals, such as tem-
perature, the peak reading will be properly converted
and held.
If rapidly changing analog signals must be held, an
external peak detector should be added. An inexpensive
circuit can be made from an op amp and a few discrete
components, as shown in Figure 5-12. The droop rate of
the external peak detector should be adjusted so that the
held voltage will not decay below the desired accuracy
level during the converter's 400msec conversion time.
FIGURE 5-12:
EXTERNAL PEAK
DETECTOR
5.12
Liquid Crystal Display (LCD)
The TC820 drives a triplex (multiplexed 3:1) LCD with
three backplanes. The LCD can include decimal points,
polarity sign, and annunciators for over range, peak
hold, high and low logic levels, and low battery.
Table 5-2 shows the assignment of the display seg-
ments to the backplanes and segment drive lines. The
backplane drive frequency is obtained by dividing the
oscillator frequency by 240.
Backplane waveforms are shown in Figure 5-13. These
appear on outputs BP1, BP2, and BP3. They remain the
same, regardless of the segments being driven.
FIGURE 5-13:
BACKPLANE
WAVEFORMS
Other display output lines have waveforms that vary
depending on the displays values. Figure 5-13 shows a
set of waveforms for the a, g, d outputs of one digit for
several combinations of "on" segments.
FIGURE 5-14:
TYPICAL DISPLAY
OUTPUT WAVEFORMS
TABLE 5-2:
LCD BACKPLANE AND
SEGMENT ASSIGNMENTS
*Connect both pins 2 and 16 of LCD to TC820 BP3 of output.
VDD
TC820
+
–
VSS
VIN+
PKHOLD
0V
0.01F
Offset Null
1N4148
+9V
10k
VIN
TL061
BP1
BP2
BP3
40-Pin
(PDIP)
44-Pin
(PQFP)
LCD Display
Pin Number
BP1
BP2
BP3
140
3
LOW
241
4
A4
"—"
3
42
5
B4
G4
E4
4
43
6
HIGH
C4
D4
544
7
A3
F3
DP3
61
8
B3
G3
E3
7
2
9
OVER
C3
D3
83
10
A2
F2
DP2
9
4
11
B2
G2
E2
10
5
12
PEAK
C2
D2
11
6
13
A1
F1
DP1
12
7
14
B1
G1
E1
13
8
2,16*
—
C1
D1
14
9
1
BP1
—
BATT
15
10
15
LOW
BP2
BP3
VDD
VH
VL
VDISP
VDD
VH
VL
VDISP
VDD
VH
VL
VDISP
VDD
VH
VL
VDISP
Segment
Line
All OFF
a Segment
ON
d, g OFF
a, g ON
d OFF
All ON
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