MICROCHIP AD8517, AD8527 Technical data

TC1047/TC1047A

Precision Temperature-to-Voltage Converter

Features

• Supply Voltage Range:

- TC1047: 2.7V to 4.4V

- TC1047A: 2.5V to 5.5V

• Wide Temperature Measurement Range:

o

--40

C to +125oC

• High Temperature Converter Accuracy:

o

-± 2

C, Max, at 25°C

• Linear Temperature Slope: 10 mV/°C (typ.)

• Available in 3-Pin SOT-23B Package

• Very Low Suppl y Current:

-35µA Typical

Applications

• Cellular Phones

• Power Supply Thermal Shutdown

• Temperature-Controlled Fans

• Temperature Measurement/Instrumentation

• Temperature Regulators

• Consumer Electronics

• Portable Battery-Powered Equipment

Block Diagram

= 2.5V to 5.5V

V

DD

PICmicro

Microcontroller

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
temperatu re from -40°C to +125 °C. W ith 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
100 mV at -40°C, 500 mV at 0°C, 7 50 mV at +25°C and

1.75V at +125°C. A 10 mV/°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.

Package Type

3-Pin SOT-23B

TC1047/1047A

®

1

(NOTE)

V

SS

3

2

V

DD

TC1047A

V

SS

© 2005 Microchip Technology Inc. DS21498C-page 1

A/D

Converter

Note: 3-Pin SOT-23B is equivalent to JEDEC TO-236

V

DD

V

OUT

TC1047/TC1047A

1.0 ELECTRICAL CHARACTERISTICS

Absolute Maximum Ratings*

Supply Voltage ......................................................+7V

Voltage on Any Pin with Respect to Supplies:

..................................................V

Operating Temperature ......................-40°C to +125°C

Storage Temperature Range..............-55°C to +150°C

ELECTRICAL CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated,

and for T

Supply Voltage V

Supply Current, Operating I
Average Slope of Output Voltage A
Temperature Accuracy TMP

Output V oltage V

Output Source and Sink Current I

= -40°C to +125°C.

A

Parameters Sym Min Typ Max Units Conditions

-0.3 to VDD +0.3V

SS

DD

Q

V

ACY

OUT

1720 1750 1780 mV T

OUT

2.7 — 4.4 V TC1047

2.5 — 5.5 V TC1047A
—3560µA
— 10 — mV/°C

-2 ±0.5 +2 °C TA = 25°C

-3 ±0.5 +3 °C TA = +125°C
—1.0— °CT
—100— mVTA = -40°C

730 750 770 mV TA = 25°C

100 — — µA

*Stresses above those listed under "Absolute Maximum Rat­ings" may cause permanent damage to the device. These are
stress ratings only and functional operation of t he device at
these or any other conditions above those indicated in the
operation sections of the specifications is not implied. Expo­sure to Absolute Maximum Rating conditions for extended
periods may affect device reliability.

these specifications apply for the entire supply voltage range

= -40°C

A

= +125°C

A

TEMPERATURE CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, V

Parameters Sym Min Typ Max Units Conditions

Temperature Ranges

Specified Temperature Range T
Operating Temperatu re Ra nge T
Storage Temperature Range T

-40 — +85 °C

A

-40 — +125 °C Note 1

A

-65 — +150 °C

A

Thermal Package Resistances

Thermal Resistan ce , 3L -SO T-23B θ

—336 — °C/W

JA

Note 1: The TC1047/TC1047A operate over this extended temperature range, but with reduced performa nce . In

any case, the Junction Temperatur e (T

) must not exceed the Absolute Maximum specification of +150°C.

J

= +2.3V to +5.5V and VSS= GND.

DD

DS21498C-page 2 © 2005 Microchip Technology Inc.

TC1047/TC1047A

5

2.0 TYPICAL PERFORMANCE CURVES

Note: The graphs and tables provided following this note are a statistical summary b as ed 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.

Note: Unless otherwise indicated, VDD = 2.7V thru 4.4V

3

2

1

0

Temp Accy (°C)

–1

–2

–3

–40

–25

5

20

35

50

–10

Temperature (°C)

65

VDD = 2.5V

=

5.5V

V

DD

80

95

110

125

FIGURE 2-1: Temperature Accuracy vs. Temperature.

and TA = -40°C to +125°C.

50

40

30

(μA)

DD

I

20

10

0

-40 -25 -10 5 20 35 50 65 80 95 110 12

VDD = 5.5V

VDD = 2.5V

Temp. (°C)

FIGURE 2-2: Supply Current vs. Temperature.

© 2005 Microchip Technology Inc. DS21498C-page 3

TC1047/TC1047A

3.0 PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1: PIN FUNCTION TABLE

Pin No. Symbol Description

1V
2V
3V

DD

OUT

SS

4.0 DETAILED DESCRIPTION

The TC1047 and TC10 47A have an out put vol tage th at
varies linearly with temperature in degrees Celsius.
Figure 4-1 shows a plot of the output voltage versus
temperature for the TC1047 and TC1047A. The
temperature slope is fixed at 10 mV/°C and the output
voltage at 0°C is 500 mV.

V

Input Supp ly Voltage
Temperature Sensor Output Terminal
Ground Terminal

= (10 mV/°C) (Temperature °C) + 500 mV

OUT

1.75

1.7

1.5

1.3

1.1

(Volts)

0.9

OUT

V

0.7

0.5

0.3

0.1

–40

–30

–20 –10

0

10 20

30

40

T emperature (°C)

FIGURE 4-1: Output Voltage vs. Temperature.

50

60

70

80

90

100

110 120 125

DS21498C-page 4 © 2005 Microchip Technology Inc.