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| 型号： | TC820CPL |
| 元件分类： | ADC |
| 英文描述： | 1-CH DUAL-SLOPE ADC, PDIP40 |
| 封装： | PLASTIC, DIP-40 |
| 文件页数： | 15/28页 |
| 文件大小： | 616K |
| 代理商： | TC820CPL |
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TC820
DS21476B-page 22
2002 Microchip Technology Inc.
5.13
LCD Source
Although most users will design their own custom LCD,
a standard display for the TC820 (Figure 5-15), Part No.
ST-1355-M1, is available from the following sources:
Crystaloid (USA)
Crystaloid Electronics
P.O. Box 628
5282 Hudson Drive
Hudson, OH 44238
Phone: 216-655-2429
Crystaloid (Europe)
Rep. France
102, rue des Nouvelles
F92150 Suresnes France
Phone: 33-1-42-04-29-25
Fax: 33-1-45-06-46-99
FIGURE 5-15:
TYPICAL TC820 LCD
5.14
Annunciator Output
The annunciator output is a square wave running
at the backplane frequency (for example, 167Hz when
FOSC = 40kHz). The peak-to-peak amplitude is equal to
(VDD –VDISP). Connecting an annunciator of the LCD
to the annunciator output turns it on; connecting it to its
backplane turns it off.
5.15
LCD Drive Voltage (VDISP)
The peak-to-peak LCD drive voltage is equal to (VDD –
VDISP). In the 40-pin dual in-line package (DIP), VDISP
is internally connected to DGND, providing a typical
LCD drive voltage of 5VP-P.
For applications with a wide temperature range, some
LCDs require that the drive levels vary with temperature
to maintain good viewing angle and display contrast. In
this case, the TC820 44-pin package provides a pin con-
nection for VDISP. Figure 5-16 shows TC820 circuits that
can be adjusted to give a temperature compensation of
about 10mV/°C between VDD and VDISP. The diode
between GND and VDISP should have a low turn on volt-
age because VDISP cannot exceed 0.3V below GND.
5.16
Crystal Source
Two sources of the 40kHz crystal are:
Statek Corp.
512 N. Main St.
Orange, CA 92668
Phone: 714-639-7810
Fax: 714-997-1256
Part #: CX-1V-40.0
SPK Electronics
2F-1, No. 312, Sec, 4, Jen Ai Rd.
Taipei, Taiwan R.O.C.
Phone: (02) 754-2677
Fax: 886-2-708-4124
Part #: QRT-38-40.0kHz
FIGURE 5-16:
TEMPERATURE COMPENSATING CIRCUITS
HIGH
LOW
OVER
PEAK
BATT
PIN 1
+
–
V+
VDISP
TC820
DGND
24
39
12
11
200k
39k
5k
75k
1N4148
V-
V+
VDISP
TC820
DGND
24
39
V-
12
11
39k
20k
2N2222
18k
Note: Pin numbers shown are for 44-pin flat package.
TL071 1N5817
1N5817
相关PDF资料 |
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| TC820CLW | DUAL-SLOPE ADC, PARALLEL ACCESS, PQCC44 |
| TC820CPL | DUAL-SLOPE ADC, PARALLEL ACCESS, PDIP40 |
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