2002 Microchip Technology Inc.
DS21498B-page 1
TC1047/TC1047A
Features
Supply Voltage Range:
- TC1047: 2.7V to 4.4V
- TC1047A: 2.5V to 5.5V
Wide Temperature Measurement Range:
-40
o
C to +125
o
C
High Temperature Converter Accuracy:
2
o
C, Max, at 25C
Linear Temperature Slope 10mV/C (typ.)
Available in 3-Pin SOT-23B Package
Very Low Supply Current:
- 35
A Typical
Applications
Cellular Phones
Power Supply Thermal Shutdown
Temperature Controlled Fans
Temperature Measurement/Instrumentation
Temperature Regulators
Consumer Electronics
Portable Battery Powered Equipment
Device Selection Table
Package Type
General Description
The TC1047 and TC1047A are linear voltage output
temperature sensors whose output voltage is directly
proportional
to
the
measured
temperature.
The
TC1047 and
TC1047A
can
accurately
measure
temperature from -40C to +125C. With the TC1047,
the supply voltage can vary between 2.7V and 4.4V.
The power supply range of the TC1047A is from 2.5V
to 5.5V.
The output voltage range for these devices is typically
100mV at -40C, 500mV at 0C, 750mV at +25C, and
1.75V at +125C. A 10mV/C voltage slope output
response
allows
for
a
predictable
temperature
measurement over a wide temperature range. The
TC1047 and TC1047A are packaged in 3-Pin SOT-23B
packages, making them ideal for space critical
applications.
Block Diagram
Part Number
Package
Temp. Range
TC1047VNB
3-Pin SOT-23B
-40C to +125C
TC1047AVNB
3-Pin SOT-23B
-40C to +125C
Note: * 3-Pin SOT-23B is equivalent to JEDEC TO-236
V
OUT
V
SS
V
DD
3-Pin SOT-23B*
TC1047
1
2
3
TC1047A
TC1047A
V
DD
= 2.5V to 5.5V
V
DD
PICmicro
A/D
V
SS
Microcontroller
Converter
Precision Temperature-to-Voltage Converter
TC1047/TC1047A
DS21498B-page 2
2002 Microchip Technology Inc.
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Supply Voltage ......................................................+7V
Voltage on Any Pin with Respect to Supplies
..................................................V
SS
-0.3 to V
DD
+0.3V
Operating Temperature ...................... -40C to +125C
Storage Temperature Range .............. -55C to +150C
*Stresses above those listed under "Absolute Maximum Rat-
ings" may cause permanent damage to the device. These are
stress ratings only and functional operation of the device at
these or any other conditions above those indicated in the
operation sections of the specifications is not implied. Expo-
sure to Absolute Maximum Rating conditions for extended
periods may affect device reliability.
TC1047/1047A ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Unless otherwise specified, these specifications apply for the entire supply voltage range and for
T
A
= -40C to +125C
Symbol
Parameter
Min
Typ
Max
Units
Test Conditions
V
DD
Supply Voltage
2.7
2.5
--
--
4.4
5.5
V
TC1047
TC1047A
I
Q
Supply Current, Operating
--
35
60
A
A
V
Average Slope of Output Voltage
--
10
--
mV/C
TMP
ACY
Temperature Accuracy
-2
-3
--
0.5
0.5
1.0
+2
+3
--
C
C
C
T
A
= 25C
T
A
= +125C
T
A
= -40C
V
OUT
Output Voltage
--
730
1720
100
750
1750
--
770
1780
mV
mV
mV
T
A
= -40C
T
A
= 25C
T
A
= +125C
I
OUT
Output Source and Sink Current
100
--
--
A
2002 Microchip Technology Inc.
DS21498B-page 3
TC1047/TC1047A
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
(3-Pin SOT-23B)
Symbol
Description
1
V
DD
Input Supply Voltage
2
V
OUT
Temperature Sensor Output Terminal
3
V
SS
Ground Terminal
TC1047/TC1047A
DS21498B-page 4
2002 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
The TC1047 and TC1047A have an output voltage that
varies linearly with temperature in degrees Celsius.
Figure 3-1 shows a plot of the output voltage versus
temperature for the TC1047 and TC1047A. The
temperature slope is fixed at 10mV/C, and the output
voltage at 0C is 500mV.
FIGURE 3-1:
OUTPUT VOLTAGE VS. TEMPERATURE
1.75
1.7
1.5
1.3
1.1
0.9
0.7
0.5
0.3
0.1
-40 -30 -20 -10 0
10 20 30 40 50 60 70 80 90 100 110 120
125
V
OUT
= (10mV/C) CTemperature C) + 500mV
V
OUT
(Volts)
TEMPERATURE (
C)
2002 Microchip Technology Inc.
DS21498B-page 5
TC1047/TC1047A
4.0
TYPICAL CHARACTERISTICS
FIGURE 4-1:
TEMPERATURE ACCURACY VS. TEMPERATURE
FIGURE 4-2:
SUPPLY CURRENT VS. TEMPERATURE
Note:
The graphs provided following this note are a statistical summary based on a limited number of samples
and are provided for informational purposes only. The performance characteristics listed herein are not
tested or guaranteed. In some graphs, the data presented may be outside the specified operating range
(e.g., outside specified power supply range) and therefore outside the warranted range.
-3
-2
-1
0
1
2
3
TEMP A
CCY (
C)
TEMPERATURE (
C)
V
DD
= 2.5V
V
DD
= 5.5V
-40
-25
-10
125
5
20
35
50
65
80
95
110
0
10
20
30
40
50
-40
-25
-10
125
I
DD
(
A)
TEMPERATURE (
C)
V
DD
= 5.5V
V
DD
= 2.5V
5
20
35
50
65
80
95
110
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