TelCom Semiconductor Inc TC03VNB, TC03VZB, TC02VZB, TC02VNB Datasheet

PRECISION		TEMPERATURE-		PRELIMINARY INFORMATION
TO -VOLTAGE		CONVERTERS		TC02

TC03

PRECISION TEMPERATURE-TO-VOLTAGE CONVERTERS

FEATURES

■Linearized Temperature-to-Voltage Converters

■Direct Centigrade Output Voltage Scaling (TC03)

■Wide Temperature Measurement

	Range (TC02) ...............................	– 20°C to +125°C
■	Excellent Temperature Converter Linearity ..		0.8°C
	Over Temperature		±2°C
■	High Temperature Converter Accuracy ..........
	at 25°C Guaranteed
■	Small Packages ................	TO-92-3 and SOT-23B-3

APPLICATIONS

■Power Supply Thermal Shut-Down

■Temperature-Controlled Fans

■Temperature Measurement/Instrumentation

■Temperature Regulators

■Consumer Electronics

FUNCTIONAL BLOCK DIAGRAM

VCC = 2.2V to 12V
	MICROCONTROLLER
VCC	A/D
	CONVERTER
VOUT
TC03
GND

GENERAL DESCRIPTION

The TC02/03 temperature sensors furnish a linearized output voltage directly proportional to measured temperature. The TC03 has a temperature measurement range of

–20°C to +100°C. Its output voltage is directly calibrated in

degrees Centigrade (i.e. VOUT = 10mV/°C x Temperature °C). An external pull-down resistor to a negative voltage

source is required for temperature measurement below 0°C.

The TC02 has a temperature measurement range of

–20°C to +125°C, and operates with a single supply. It has

the same output voltage slope with temperature as the TC03 (10mV/°C). The output voltage range is 300mV at

–20°C to 1,750mV at +125°C.

Small size, low cost and low power operation make the TC02/03 suitable for a wide range of general purpose temperature measurement applications.

ORDERING INFORMATION

Output

Voltage

Part No.

Package

At 25°C

Temp. Range

TC02VNB

*SOT-23B-3

750mV – 20°C to +125°C

TC02VZB

TO-92

750mV – 20°C to +125°C

TC03VNB

*SOT-23B-3

250mV – 20°C to +100°C

TC03VZB

TO-92

250mV – 20°C to +100°C

NOTE: *SOT-23B-3 is equivalent to JEDEC (TO-236)

.

PIN CONFIGURATION

*SOT-23B-3

TO-92-3

(Top View)

1

2

3

GND

3

TC02VZB

TC03VZB

TC02VNB

TC03VNB

1

2

CC

OUT

VCC

VOUT

V

V GND

NOTE: *SOT-23B-3 is equivalent

to JEDEC (TO-236)

TC02/03-04 6/18/97 TelCom Semiconductor reserves the right to make changes in the circuitry and specifications1 of its devices.

PRELIMINARY INFORMATION PRECISION TEMPERATURETO -VOLTAGE CONVERTERS

TC02

TC03

ABSOLUTE MAXIMUM RATINGS *

Supply Voltage ............................................................	15V
Input Voltage, Any Terminal ..............	– 1.0 to (VCC +0.3V)
Operating Temperature (TC02) .............	– 20°C to +125°C
Operating Temperature (TC03) .............	– 20°C to +100°C
Storage Temperature ............................	– 55°C to +150°C
Lead Temperature (Soldering, 10 sec)
SOT-23B-3 .....................................................	+260°C
TO-92-3 ..........................................................	+300°C

* Static-sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. Stresses above those listed under Absolute Maximum Ratings 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 operational sections of the specifications is not implied.

Exposure to Absolute Maximum Rating Conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS : TA = – 20°C to +125°C, VCC = 5V ±5%, unless otherwise specified.

Symbol	Parameter	Test Conditions	Min	Typ	Max	Unit
VCC	Supply Voltage (TC02)		3.0	—	12	V
VCC	Supply Voltage (TC03)		2.2	—	12	V
IS	Supply Current	Note 1	—	40	60	μA
ISRC	VOUT Output Source Current		—	—	1.0	mA
	Accuracy at Room Temperature	TA = 25°C (Note 2)	– 2	± 0.5	+2	°C
	Accuracy at Minimum Temperature	TC02: TA = – 20°C	– 7	± 0.5	+5	°C
		TC03: TA = – 20°C	– 7	± 0.5	+5
		(Note 2)
	Accuracy at Maximum Temperature	TC02: TA = +125°C	– 3	—	+3	°C
	(Note 2)	TC03: TA = +100°C	– 3	—	+3
	Nonlinearity	Note 3, 4	– 0.8	—	+0.8	°C
	Line Regulation		—	80	—	μV/V
AV	Average Slope of Output Voltage		—	10	—	mV/°C
VOUTMAX	Maximum Output Voltage	TC02: 3.0V ≤ VCC ≤ 12V
		TC03: 2.2V ≤ VCC ≤ 12V	—	—	VCC – 1.2	V
		(Note 1)

Notes: 1. VOUT outputs open circuited.

2. Accuracy = Difference between calculated output voltage (10mV/°C x Device case temperature at specified temperature and power supply) and measured output voltage expressed in °C.

3.Nonlinearity = deviation of output voltage versus temperature from the best-fit straight line over the device rated temperature range.

4.Guaranteed by design.

DETAILED DESCRIPTION

A plot of output voltage versus temperature for both the TC02 and TC03 appears in Figure 1. The TC03 can be used with single power supply to measure temperatures from 0°C to 100°C. A pull-down resistor (R1 in Figure 2) must be added from VOUT to the negative power supply for measuring temperatures less than 0°C. The value of the resistor must be chosen to limit the maximum current pulled from the output to the negative supply to

– 50μA (i.e. R1 = VSS/50μA).

OUTPUT STAGE

Both the TC02 and TC03 have Class A output stages capable of sourcing 1mA. These devices have a limited ability to drive heavy capacitive loads. Loads of 50pF (to ground) can be driven directly. For heavier loads, a 2kΩ (or greater) resistor should be placed in series with the output for decoupling. If the TC02/03 is used in a noisy electrical environment, a 0.1μF bypass capacitor from VCC to GND is recommended.

TC02/03-04 6/18/97

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PRECISION TEMPERATURETO -VOLTAGE CONVERTERS

PRELIMINARY INFORMATION

																	TC02
																	TC03
	1.8
	1.7	TC02: VOUT = (10mV/°C) (Temperature °C) + 500mV
	1.6	TC03: VOUT = (10mV/°C) (Temperature °C)
	1.5
	1.4
	1.3
	1.2
	1.1				TC02
(VOLTS)	1.0
	0.9
	0.8
OUT
	0.7								TC03
V
	0.6
	0.5
	0.4
	0.3
	0.2
	0.1
	0
	– 0.1
	– 0.2
	– 40	– 30	– 20	–10	0	10	20	30	40	50	60	70	80	90	100	110	120	130

TEMPERATURE (°C)

Figure 1. Output Voltage vs Temperature

VCC = 2.2V to 12.0V MIN.

VCC = 3.0V to 12.0V

VCC

VCC

V

OUT

V

VOUT

V

TC03

OUT

TC02

OUT

GND

R1

GND

R1 = VSS/50 A

VSS

TC03 (– 20°C to +100°C)

TC02 (– 20°C to +125°C)

Figure 2. TC02/03 Power Supply Connections for Full Scale Measurements

TC02/03-04 6/18/97

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