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参数资料
| 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： | 14/24页 |
| 文件大小： | 185K |
| 代理商： | TC820CPL |
21
TC820
3-3/4 A/D Converter with Frequency
Counter and Logic Probe
TC820-10 10/17/96
2001 Microchip Technology Inc.
DS21476A
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
Figure 24. Backplane Waveforms
LCD Source
Although most users will design their own custom LCD,
a standard display for the TC820 (Figure 26), Part No. ST-
1355-M1, is available from:
Crystaloid (USA)
Crystaloid (Europe)
Crystaloid Electronics
Rep France
P.O. Box 628
102, rue des Nouvelles
5282 Hudson Dr.
F92150 Suresnes
Hudson, OH 44238
France
Phone: (216) 655-2429
Phone: 33-1-42 04 29 25
Fax: (216) 655-2176
Fax: 33-1-45 06 46 99
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.
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 connection
for VDISP. Figure 27 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 voltage because
VDISP cannot exceed 0.3V below GND.
Crystal Source
Two sources of the 40 kHz crystal are:
Statek Corp.
SPK Electronics
512 N. Main St.
2F-1, No. 312, Sec. 4,
Orange, CA 92668
Jen Ai Rd
Phone: (714) 639-7810
Taipei, Taiwan R.O.C.
Fax: (714) 997-1256
Phone: (02) 754-2677
Part #: CX-1V-40.0
Fax: 886-2-708-4124
Part#: QRT-38-40.0kHz
BP1
BP2
BP3
Figure 26. Typical TC820 LCD
Figure 25. Typical Display Output Waveforms
HIGH
LOW
OVER
PEAK
BATT
PIN 1
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