TC820CLW Microchip Technology, TC820CLW Datasheet - Page 22

• Manufacturer Part Number: TC820CLW
• Description: IC ADC 3 3/4DGT LGC PROBE 44PLCC
• Manufacturer: Microchip Technology

Specifications of TC820CLW

• Display Type: LCD
• Configuration: 7 Segment + 2 Annunciators
• Digits Or Characters: A/D 3.75 Digits
• Current - Supply: 1mA
• Voltage - Supply: 9V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Interface: -

TC820
TABLE 5-2:
5.13
Although most users will design their own custom LCD,
a standard display for the TC820
ST-1355-M1, is available from the following sources:
FIGURE 5-15:
DS21476C-page 22
Crystaloid (USA)
Crystaloid Electronics
P.O. Box 628
5282 Hudson Drive
Hudson, OH 44238
Phone: [phone]
Crystaloid (Europe)
Rep. France
102, rue des Nouvelles
F92150 Suresnes France
Phone: [phone]
Fax: [phone]
(PDIP)
40-Pin
10
12
13
14
15
11
1
2
3
4
5
6
7
8
9
*
(PQFP)
LCD Source
44-Pin
HIGH
LOW
40
41
42
43
44
10
Connect both pins 2 and 16 of LCD to
TC820 BP3 of output.
1
2
3
4
5
6
7
8
9
PIN 1
LCD Display
Pin Number
LCD BACKPLANE AND
SEGMENT ASSIGNMENTS
OVER
2,16*
10
12
13
14
15
11
Typical
3
4
5
6
7
8
9
1
PEAK
TC820
OVER
PEAK
HIGH
LOW
LOW
BP1
(Figure
BP1
A4
B4
A3
B3
A2
B2
A1
B1
—
BATT
LCD.
5-15), Part No.
BP2
BP2
"—"
G4
C4
G3
C3
G2
C2
G1
C1
F3
F2
F1
—
BATT
BP3
DP3
DP2
DP1
BP3
D4
D3
D2
D1
E4
E3
E2
E1
5.14
The annunciator output is a square wave running
at the backplane frequency (for example, 167Hz when
F
(V
to the annunciator output turns it on; connecting it to its
backplane turns it off.
5.15
The peak-to-peak LCD drive voltage is equal to (V
V
is internally connected to DGND, providing a typical
LCD drive voltage of 5V
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
that can be adjusted to give a temperature compensa-
tion of about 10mV/°C between V
diode between GND and V
on voltage because V
GND.
5.16
Two sources of the 40kHz crystal are:
Statek Corp.
512 N. Main St.
Orange, CA 92668
Phone: [phone]
Fax: [phone]
Part #: CX-1V-40.0
SPK Electronics
2F-1, No. 312, Sec, 4, Jen Ai Rd.
Taipei, Taiwan R.O.C.
Phone: [phone]
Fax: [phone]
Part #: QRT-38-40.0kHz
OSC
DISP
DD
– V
). In the 40-pin dual in-line package (DIP), V
= 40kHz). The peak-to-peak amplitude is equal to
Annunciator Output
DISP
LCD Drive Voltage (V
Crystal Source
). Connecting an annunciator of the LCD
DISP
.
Figure 5-16
DISP
P-P
© 2007 Microchip Technology Inc.
.
DISP
cannot exceed 0.3V below
should have a low turn
shows TC820 circuits
DD
DISP
and V
)
DISP
. The
DD
DISP
–