TC1046
High Precision Temperature -to-Voltage Converter
Features
• Supply VoltageRange: 2.7V to 4.4V
• Wide Temperature Measurement Range:
o
-40
Cto+125οC
• High Temperature Converter Accuracy:
o
±2
C, Max, at 25°C
o
• Linear Temperature Slope: 6.25mV/
• Very Low Supply Current: 35µATypical
• Small 3-Pin SOT-23B Package
C
Applications
• Cellular Phones
• Power Supply Thermal Shutdown
• Temperature Controlled Fans
• Temperature Measurement/Instrumentation
• Temperature Regulators
• Consumer Electronics
• Portable Battery Powered Equipment
Device Selection Table
Part Number Package Temp. Range
TC1046VNB 3-Pin SOT-23B -40°C to +125°C
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 packagedin a 3-Pin SOT-23B package,
making them ideal for space critical applications.
Functional Block Diagram
V
= 2.5V to 5.5V
DD
®
A/D
1
V
DD
V
TC1046
V
SS
3
OUT
PICmicro
Microcontroller
2
Converter
Package Type
3-Pin SOT-23B*
V
SS
3
TC1046
V
2
OUT
1
V
DD
Note: *3-Pin SOT-23B is equivalent to JEDEC TO-236
2002 Microchip TechnologyInc. DS21496B-page 1
TC1046
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Supply Voltage ......................................................+7V
*Stresses above those listed under "Absolute Maximum Ratings"maycause permanentdamage 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. Exposure to Absolute Maximum R ating conditions for extended
periodsmay affectdevice reliability.
Voltage on Any Pin with Respect to Supplies:
.................................................V
-0.3 to VDD+0.3V
SS
Operating Temperature ......................-40°C to +125°C
StorageTemperature Range..............-55°C to +150°C
TC1046 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: These specifications apply for the entire supply voltage range and for TA= -40°C to +125°C, unless
otherwise specified.
Symbol Parameter Min Typ Max Units Test Conditions
V
DD
I
Q
A
V
TMP
V
OUT
I
OUT
Supply Voltage 2.7 — 4.4 V
Supply Current, Operating — 35 60 µA
Average Slope of Output Voltage — 6.25 — mV/°C
T emperature Accuracy at 25°C -2
ACY
Output Voltage —
Output Source and Sink Current 100 — — µA
-3
—
568
1187
±0.5
±0.5
1.0
174
580
1205
193
592
1224
+2
+3
—
°C
°C
°C
mV
mV
mV
TA=25°C
T
= +125°C
A
T
=-40°C
A
T
=-40°C
A
T
= 25°C
A
T
= +125°C
A
2.0 PIN DESCRIPTIONS
ThedescriptionsofthepinsarelistedinTable2-1
TABLE 2-1: PIN FUNCTION TABLE
Pin Num ber
(3-Pin SOT-23B)
1V
2V
3V
Symbol Description
DD
OUT
SS
Input Supply Voltage
Temperature Sensor Output
Ground
DS21496B-page 2
2002 Microchip TechnologyInc.
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
= (6.25 mV/ (˚C) (Temperature (˚C) + 424mV
OUT
1.20525
1.174
1.049
0.924
0.799
0.674
(Volts)
OUT
0.549
V
0.424
0.299
0.174
TC1046
-40
-30
-20 -10
0
10 20
30
50
40
TEMPERATURE (˚C
100
80
60
70
90
110 120 125
2002 Microchip TechnologyInc DS21496B-page 3
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