TC7107CPL Microchip Technology, TC7107CPL Datasheet - Page 17

• Manufacturer Part Number: TC7107CPL
• Description: IC ADC 3 1/2DGT LED DVR 40-DIP
• Manufacturer: Microchip Technology

Specifications of TC7107CPL

• Package / Case: 40-DIP (0.600", 15.24mm)
• Display Type: LED
• Configuration: 7 Segment
• Digits Or Characters: A/D 3.5 Digits
• Current - Supply: 800µA
• Voltage - Supply: 5V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Architecture: Dual Slope
• Input Type: Voltage
• Maximum Power Dissipation: 1230 mW
• Maximum Operating Temperature: + 70 C
• Mounting Style: Through Hole
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Interface: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 158-1129; 158-1129

FIGURE 8-2:
The analog common pin serves to set the analog section
reference or common point. The TC7106A is specifically
designed to operate from a battery, or in any
measurement system where input signals are not
referenced (float), with respect to the TC7106A power
source. The analog common potential of V+ – 3.0V gives
a 6V end of battery life voltage. The common potential
has a 0.001% voltage coefficient and a 15Ω output
impedance.
With sufficiently high total supply voltage (V+ – V- >
7.0V), analog common is a very stable potential with
excellent temperature stability, typically 20 ppm/°C.
This potential can be used to generate the reference
voltage. An external voltage reference will be
unnecessary in most cases because of the 50 ppm/°C
maximum temperature coefficient. See Section 8.5
“Internal Voltage Reference”.
8.4
The TEST pin potential is 5V less than V+. TEST may
be used as the negative power supply connection for
external CMOS logic. The TEST pin is tied to the
internally generated negative logic supply (Internal
Logic Ground) through a 500Ω resistor in the
TC7106A. The TEST pin load should be no more than
1 mA.
If TEST is pulled to V+ all segments plus the minus sign
will be activated. Do not operate in this mode for more
than several minutes with the TC7106A. With
TEST = V+, the LCD segments are impressed with a
DC voltage which will destroy the LCD.
The TEST pin will sink about 10 mA when pulled to V+.
8.5
The analog common voltage temperature stability has
been significantly improved
version of the industry standard circuits allow users to
upgrade old systems and design new systems without
© 2008 Microchip Technology Inc.
TEST (Pin 37)
Internal Voltage Reference
V+
Source
Power
V-
Common Mode Voltage Removed in Battery Operation with V
GND
V+
V-
Measured
System
(Figure
GND
8-3). The “A”
Analog
Common
V
V
V
IN -
IN +
BUF
V
REF -
external voltage references. External R and C values
do not need to be changed.
common supplying the necessary voltage reference for
the TC7106A/TC7107A.
FIGURE 8-3:
Temperature Coefficient.
FIGURE 8-4:
Connection.
TC7106A
C
AZ
TC7106/A/TC7107/A
V
REF
V
+
180
160
140
120
100
INT
200
80
60
40
20
0
V+
Set V
+
Segment
No Maximum Specified
REF
9V
Drive
V-
Maximum
POL
Typical
7106A
TC7106A
TC7107A
= 1/2 V
Limit
TC
OSC1
OSC3
OSC2
V-
BP
Common
Analog Common
Internal Voltage Reference
Analog
V
FULL SCALE
V
REF +
REF
LCD Display
V+
Maximum
Specified
Typical
ICL7106
IN
1
-
Figure 8-4
No
- = Analog Common.
36
35
32
V
REF
DS21455D-page 17
Maximum
Specified
ICL7136
Typical
24k Ω
1k Ω
shows analog
No