TC1046
High Precision Temperature-to-Voltage Converter
Features
• Supply Voltage Range: 2.7V to 4.4V
• Wide Temperature Measurement Range:
-40
o
C to +125
ο
C
• High Temperature Converter Accuracy:
± 2
o
C, Max, at 25°C
• Linear Temperature Slope: 6.25mV/
o
C
• Very Low Supply Current: 35µA Typical
• Small 3-Pin SOT-23B Package
General Description
The TC1046 is a linear output temperature sensor
whose output voltage is directly proportional to
measured temperature. The TC1046 can accurately
measure temperature from -40°C to +125°C.
The output voltage range for these devices is typically
174mV at -40°C, 424mV at 0°C, 580 mV at +25°C, and
1205mV at +125°C. A 6.25mV/°C voltage slope allows
for the wide temperature range.
The TC1046 is packaged in a 3-Pin SOT-23B package,
making them ideal for space critical applications.
Applications
•
•
•
•
•
•
•
Cellular Phones
Power Supply Thermal Shutdown
Temperature Controlled Fans
Temperature Measurement/Instrumentation
Temperature Regulators
Consumer Electronics
Portable Battery Powered Equipment
Functional Block Diagram
V
DD
= 2.5V to 5.5V
PICmicro®
Microcontroller
2
A/D
Converter
1
V
DD
V
OUT
Device Selection Table
Part Number
TC1046VNB
Package
3-Pin SOT-23B
Temp. Range
-40°C to +125°C
TC1046
V
SS
3
Package Type
3-Pin SOT-23B*
V
SS
3
TC1046
1
V
DD
2
V
OUT
Note:
*3-Pin SOT-23B is equivalent to JEDEC TO-236
2002 Microchip Technology Inc.
DS21496B-page 1
©
TC1046
1.0
ELECTRICAL
CHARACTERISTICS
*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.
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 ...................... -40°C to +125°C
Storage Temperature Range .............. -55°C to +150°C
TC1046 ELECTRICAL SPECIFICATIONS
Electrical Characteristics:
These specifications apply for the entire supply voltage range and for T
A
= -40°C to +125°C, unless
otherwise specified.
Symbol
V
DD
I
Q
A
V
TMP
ACY
Supply Voltage
Supply Current, Operating
Average Slope of Output Voltage
Temperature Accuracy at 25°C
Parameter
Min
2.7
—
—
-2
-3
—
—
568
1187
100
Typ
—
35
6.25
±0.5
±0.5
1.0
174
580
1205
—
Max
4.4
60
—
+2
+3
—
193
592
1224
—
Units
V
µA
mV/°C
°C
°C
°C
mV
mV
mV
µA
T
A
= 25°C
T
A
= +125°C
T
A
= -40°C
T
A
= -40°C
T
A
= 25°C
T
A
= +125°C
Test Conditions
V
OUT
Output Voltage
I
OUT
Output Source and Sink Current
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1
TABLE 2-1:
PIN FUNCTION TABLE
Symbol
V
DD
V
OUT
V
SS
Input Supply Voltage
Temperature Sensor Output
Ground
Description
Pin Number
(3-Pin SOT-23B)
1
2
3
©
DS21496B-page 2
2002 Microchip Technology Inc.
TC1046
3.0
DETAILED DESCRIPTION
The TC1046 has an output voltage that varies linearly
with temperature in degrees Celsius. See Figure 3-1,
“Output Voltage versus Temperature” for the TC1046.
The temperature slope is fixed at 6.25mV/°C and the
output voltage at 0°C is 424mV.
FIGURE 3-1:
OUTPUT VOLTAGE VS. TEMPERATURE
V
OUT
= (6.25 mV/ (˚C) (Temperature (˚C) + 424mV
1.20525
1.174
1.049
0.924
V
OUT
(Volts)
0.799
0.674
0.549
0.424
0.299
0.174
-40
-30 -20 -10
30
50
60
70 80
90 100 110 120
125
0
10
20
40
TEMPERATURE (˚C)
2002 Microchip Technology Inc
DS21496B-page 3
©
TC1046
4.0
Note:
TYPICAL CHARACTERISTICS
The graphs and tables 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 or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Temperature Accuracy vs. Temperature
4.0
3.0
TEMP. ACCURACY (˚C)
2.0
1.0
0.0
-1.0
-2.0
-3.0
-4.0
-50 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90 100 110 120
130
140
V
DD
V
DD
= 2.5V
= 5.5V
TEMPERATURE (˚C)
Supply Current I
DD
vs. Temperature
60.0
50.0
V
DD
40.0
I
DD
(µA)
=5.5V
30.0
V
DD
20.0
= 2.5V
10.0
0.0
–40
–25
–10
5
20
35
50
65
80
95
110
125
TEMPERATURE (˚C)
©
DS21496B-page 4
2002 Microchip Technology Inc.
TC1046
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
1 & 2 = part number code + temperature range and
voltage (two letter code)
Ex: 1046VNB = AK
3 = Year and two-month period code
4 = Lot ID number
5.2
Taping Form
Component Taping Orientation for 3-Pin SOT-23B (JEDEC TO-236) Devices
User Direction of Feed
Device
Marking
W
PIN 1
P
Standard Reel Component Orientation
For TR Suffix Device
(Mark Right Side Up)
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
3-Pin SOT-23B
8 mm
4 mm
3000
7 in
2002 Microchip Technology Inc
DS21496B-page 5
©
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