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參數(shù)資料
| 型號(hào)： | TC820CPL |
| 廠商： | Microchip Technology Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | 3-3/4 Digit A/D Converter with Frequency Counter and Logic Probe |
| 中文描述： | 3-3/4位A / D轉(zhuǎn)換頻率計(jì)數(shù)器和邏輯轉(zhuǎn)換的探討 |
| 文件頁數(shù)： | 21/22頁 |
| 文件大?。?/td> | 275K |
| 代理商： | TC820CPL |
3-169
TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
BP1
BP2
BP3
TC820
3-3/4 A/D CONVERTER WITH
FREQUENCY COUNTER
AND LOGIC PROBE
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 Electronics
P.O. Box 628
5282 Hudson Dr.
Hudson, OH 44238
Phone: (216) 655-2429
Fax: (216) 655-2176
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
Annunciator Output
The annunciator output is a square wave running
at the backplane frequency (for example, 167Hz when
f
OSC
= 40kHz). The peak-to-peak amplitude is equal to (V
DD
– V
DISP
). Connecting an annunciator of the LCD to the
annunciator output turns it on; connecting it to its backplane
turns it off.
LCD Drive Voltage (V
DISP
)
The peak-to-peak LCD drive voltage is equal to (V
DD
–
V
DISP
). In the 40-pin dual-in-line package (DIP), V
DISP
is
internally connected to DGND, providing a typical LCD drive
voltage of 5V
P-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 V
DISP
. Figure 27 shows TC820 circuits that can be
adjusted to give a temperature compensation of about
10mV/
°
C between V
DD
and V
DISP
. The diode between GND
and V
DISP
should have a low turn-on voltage because V
DISP
cannot exceed 0.3V below GND.
Crystal Source
Two sources of the 40 kHz 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
Jen Ai Rd
Taipei, Taiwan R.O.C.
Phone: (02) 754-2677
Fax: 886-2-708-4124
Part#: QRT-38-40.0kHz
Figure 26. Typical TC820 LCD
Figure 25. Typical Display Output Waveforms
HIGH
LOW
OVER
PEAK
BATT
PIN 1
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| TC820CLW | 3-3/4 DIGIT A/D CONVERTER WITH FREQUENCY COUNTER AND LOGIC PROBE |
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