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参数资料
| 型号： | TC820C/LW |
| 元件分类： | ADC |
| 英文描述： | 1-CH 3-BIT DUAL-SLOPE ADC, PARALLEL ACCESS, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 15/34页 |
| 文件大小： | 435K |
| 代理商： | TC820C/LW |
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TC820
DS21476C-page 22
2007 Microchip Technology Inc.
TABLE 5-2:
LCD BACKPLANE AND
SEGMENT ASSIGNMENTS
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:
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
that can be adjusted to give a temperature compensa-
tion 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.
5.16
Crystal Source
Two sources of the 40kHz crystal are:
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
*
Connect both pins 2 and 16 of LCD to
TC820 BP3 of output.
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
HIGH
LOW
OVER
PEAK
BATT
PIN 1
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
相关PDF资料 |
PDF描述 |
|---|---|
| TC820C/PL | 1-CH 3-BIT DUAL-SLOPE ADC, PARALLEL ACCESS, PDIP40 |
| TC820C/KW | 1-CH 3-BIT DUAL-SLOPE ADC, PARALLEL ACCESS, PQFP44 |
| TC820CKWTR | 1-CH DUAL-SLOPE ADC, PQFP44 |
| TC820CLWTR | 1-CH DUAL-SLOPE ADC, PQCC44 |
| TC820CKW | 1-CH DUAL-SLOPE ADC, PQFP44 |
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