Datasheet TC1024VUA, TC1024VOA, TC1023VUA, TC1023VOA Datasheet (TelCom Semiconductor)

PRECISION TEMPERATURE-TO-VOLTAGE

PRELIMINARY INFORMATION

CONVERTERS WITH SHUTDOWN MODE

PRECISION TEMPERATURE-TO-VOL TAGE CONVERTERS
WITH SHUTDOWN MODE

TC1023

TC1023
TC1024

TC1024

FEATURES

■ Linearized Temperature-to-Voltage Converters

■

Direct Centigrade Output Voltage Scaling (TC1023)

■ Shutdown/Calibrate Mode

■ Multi-Zone Temperature Sensing Capability

■ Wide Temperature Measurement

Range (TC1024) ........................... – 20°C to +125°C

■ Excellent Temperature Converter Linearity ..0.8°C

Over Temperature

■ High Temperature Converter Accuracy......... ± 2°C

at 25°C Guaranteed

■ Small Packages .........8-Pin SOIC and 8-Pin MSOP

APPLICATIONS

■ Power Supply Thermal Shut-Down

■ Temperature-Controlled Fans

■ Temperature Measurement/Instrumentation

■ Temperature Regulators

■ Consumer Electronics

■ Lithium Battery Temperature Monitor

TYPICAL APPLICATION

GENERAL DESCRIPTION

The TC1023/1024 temperature sensors furnish a lin­earized output voltage directly proportional to measured
temperature. The TC1023 has a temperature measure­ment range of – 20°C to +100°C. Its output voltage is
directly calibrated in degrees Centigrade (i.e., V

OUT

=
10mV/°C x Temperature °C). An external pull-down resis­tor to a negative voltage source is required for temperature
measurement below 0°C.

The TC1024 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
TC1023 (10mV/°C). The output voltage range is 100mV at
– 20°C to 1,750mV at +125°C. Both devices have a chip
enable input that reduces supply current to 1µA (typical)
when pulled active high. In this state, the output defaults to
a high resistance allowing an external reference voltage to
be directly connected for A/D calibration.

Small size, low cost, flexibility and low power operation
make the TC1023/1024 suitable for a wide range of gen­eral purpose temperature measurement applications.

ORDERING INFORMATION

V

= 2.2V to 12V

CC

VCC

TC1023

GND

TC1023/1024-05 6/12/97

Part No. Package At 25°C Temp. Range

TC1023VOA 8-Pin SOIC 250mV – 20°C to +100°C

MICROCONTROLLER

TC1023VUA 8-Pin MSOP 250mV – 20°C to +100°C
TC1024VOA 8-Pin SOIC 750mV – 20°C to +125°C

V

OUT

A/D

CONVERTER

TC1024VUA 8-Pin MSOP 750mV – 20°C to +125°C

PIN CONFIGURATION

CE

V

18

I/O LINE

TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.

OUT

27

NC

NC

36
45

GND

1

8-Pin SOIC

TC1023VOA
TC1024VOA

Output
Voltage

V

CC
NC
NC

CE

V

OUT

NC

NC

GND

MSOP-8

1
2

TC1023VUA

3

TC1024VUA

4

8

V

CC

7

NC

6

NC
CE

5

PRELIMINARY INFORMATION

TC1023
TC1024

PRECISION TEMPERATURE-TO-VOLTAGE

CONVERTERS WITH SHUTDOWN MODE

ABSOLUTE MAXIMUM RATINGS *

Supply Voltage ............................................................15V

Input Voltage, Any Terminal..............– 1.0 to (VCC +0.3V)

Operating Temperature (TC1023).........– 20°C to +100°C

Operating Temperature (TC1024).........– 20°C to +125°C

Storage Temperature ............................– 55°C to +150°C

Lead Temperature (Soldering, 10 sec) ................. +300°C

ELECTRICAL CHARACTERISTICS :

TA = – 20°C to +125°C, VCC = 5V ±5%,

* 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.

GND = 0V, unless otherwise specified.

Symbol Parameter Test Conditions Min Typ Max Unit

V

CC

Supply Voltage (TC1023) 2.2 — 12 V
(TC1024) 3.0 — 12

I

S

Supply Current CE = V

IL

—4060 µA

(Note 1)

I

CE

Shutdown Current CE = V

IH

—1 5 µA

(Note 2)
V
V
I

CE

t

REC

IH
IL

CE Input Logic HIGH Level 2.0 — — V
CE Input Logic LOW Level — — 0.8 V
CE Input Leakage Current CE = V
Recovery Time from Shutdown CE = step from VIH to V

IH

or V

IL

IL

–1 — +1 µA
— 400 — µsec

(Note 3)
V

OUT

V

Output Voltage (TC1024) TA = – 20°C and +125°C 270 — 1780 mV

OUT

V

Output Voltage (TC1023) TA = – 20°C and +100°C – 230 — 1030

OUT

Circuit per Figure 1:

R1 = 240kΩ

V

= – 12V

SS

(Note 1)
I

SRC

V

Output Source Current — — 1.0 mA

OUT

Accuracy at Room Temperature

TA = +25°C – 2 — +2 °C

(Note 4)

Accuracy at Minimum Temperature TC1023: TA = – 20°C – 4 — +4 °C

TC1024: T

= – 20°C

A

(Note 4)

Accuracy at Maximum Temperature TC1023: TA = +100°C – 3 — +3 °C

TC1024: T

= +125°C

A

(Note 4)

Nonlinearity Note 5 – 0.8 — +0.8 °C
Line Regulation — 80 — µV/V

A

V

V

OUTMAX

Average Slope of Output Voltage — 10 — mV/°C
Maximum Output Voltage

TC1023: 2.2V ≤ VCC ≤ 12V

——V

– 1.2 V

CC

TC1024: 3.0V ≤ VCC ≤ 12V

(Note 1)

NOTES: 1. V

temperature driving a 100pF capacitive load.

outputs open circuited.

OUT

2. V

is 0V through approximately 100kΩ to ground when CE = VIH.

OUT

3. Recovery time is the period required for V

4. 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.

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

to rise from 0V (shutdown state) to the voltage corresponding to the measured

OUT

TC1023/1024-05 6/12/97

2

PRECISION TEMPERATURE-TO-VOLTAGE

TC102x

GND

CE

V

CC

V

CC

V

OUT

TC102x

GND

Zone 1/Zone 2

Zone 1

Zone 2

CE

V

CC

V

OUT

I/O Pin

MICROCONTROLLER

A/D

CONVERTER

CONVERTERS WITH SHUTDOWN MODE

PRELIMINARY INFORMATION

TC1023
TC1024

DETAILED DESCRIPTION

A plot of output voltage versus temperature for both the
TC1023 and TC1024 appears in Figure 5. The TC1023 can
be used with single power supply to measure temperatures
from 0°C to 100°C. A pull-down resistor (R1 in Figure 1)
must be added from the output pin 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 devices 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 TC1023/1024 is used in a noisy electrical environ­ment, a 0.1µF bypass capacitor from VCC to GND is recom­mended.

Shutdown/Calibrate Mode

The TC1023/1024 enters shutdown when the CE input
is taken to VIH. This causes quiescent current to fall to 1µA
(typ) and the output to drop immediately to 0V through
approximately 100kΩ. For applications where the TC1023/
1024 is connected to an external A/D converter, a refer­ence voltage can be directly connected to V
shutdown for A/D calibration, as shown in Figure 3. A
CMOS gate provides bias voltage to the bandgap refer­ence VR, and at the same time disables the TC102x by
taking CE to VIH. Limiting resistor R1 should be chosen to
limit current through the voltage reference to the desired
current (I

). That is, R1 = (VOH – V

REF

REF

)/I

REF

is the CMOS gate output high voltage at output current
equal to I

; and V

REF

= 2.2V to 12.0V MIN.

V

CC

is the reference voltage of VR).

REF

while in

OUT

(where V

OH

= 3.0V to 12.0V

V

CC

V

CC

TC1024

CE

GND

TC1024 (– 20°C to +125°C)

Figure 2. TC1024 Connections

2.5V
REF

CE

V

CC

V

CC

V

TC102x

OUT

GND

Figure 3. A/D Calibration

V

OUT

CONVERTER

R1

A/D

V

OUT

CMOS

GATE

CAL

Multi-Zone Temperature Sensing

The CE input facilitates multi-zone temperature sens­ing as shown in the example of Figure 4. In this example,
the processor addresses either of two sensors with a single
I/O port pin. The TC102x V
and routed to the processor's A/D converter, eliminating
the need for separate A/D input channels for each sensor.

pins are connected together

OUT

TC1023/1024-05 6/12/97

V

CC

/50µA

V

OUT

Figure 4. TC1023/1024 Addressing

3

V

OUT

TC1023

CE

GND

Figure 1. TC1023 Connections

R1

= V

V

SS

SS

PRELIMINARY INFORMATION

TC1023
TC1024

1.8

1.7

1.6

1.5

1.4

1.3

1.2

1.1

1.0

0.9

(VOLTS)

0.8

0.7

OUT

V

0.6

0.5

0.4

0.3

0.2

0.1
0

– 0.1

– 0.2

– 40

TC1023: V
TC1024: V

– 30 – 20

= (10mV/°C) (Temperature °C)

OUT

= (10mV/°C) (Temperature °C) + 500mV

OUT

TC1024

–10

0

PRECISION TEMPERATURE-TO-VOLTAGE

CONVERTERS WITH SHUTDOWN MODE

TC1023

10

30

20

50

40

60 70 80 90 100 110 120

130

TEMPERATURE (°C)

Figure 5. Output Voltage vs. Temperature

TC1023/1024-05 6/12/97

4

PRECISION TEMPERATURE-TO-VOLTAGE
CONVERTERS WITH SHUTDOWN MODE

PACKAGE DIMENSIONS

8-Pin SOIC

PIN 1

PRELIMINARY INFORMATION

TC1023
TC1024

.050 (1.27) TYP.

.197 (5.00)
.189 (4.80)

.018 (0.46)
.014 (0.36)

.157 (3.99)
.150 (3.81)

.010 (0.25)
.004 (0.10)

.069 (1.75)
.053 (1.35)

PIN 1

.244 (6.20)
.228 (5.79)

8°MAX.

8-Pin MSOP

.010 (0.25)
.007 (0.18)

.050 (1.27)
.016 (0.40)

TC1023/1024-05 6/12/97

.026 (0.65) TYP.

.122 (3.10)
.114 (2.90)

.016 (0.40)
.010 (0.25)

.006 (0.15)

.002 (0.05)

.122 (3.10)
.114 (2.90)

.197 (5.00)
.187 (4.80)

.043 (1.10)

MAX.

6°MAX.

5

.008 (0.20)
.005 (0.13)

.028 (0.70)
.016 (0.40)

Dimensions: inches (mm)

PRELIMINARY INFORMATION

TC1023
TC1024

PRECISION TEMPERATURE-TO-VOLTAGE

CONVERTERS WITH SHUTDOWN MODE

Sales Offices

TelCom Semiconductor

1300 Terra Bella Avenue
P.O. Box 7267
Mountain View, CA 94039-7267
TEL: [phone]
FAX: [phone]
E-Mail: [e-mail]

TC1023/1024-05 6/12/97

TelCom Semiconductor

Austin Product Center
9101 Burnet Rd. Suite 214
Austin, TX 78758
TEL: [phone]
FAX: [phone]

6

TelCom Semiconductor H.K. Ltd.

10 Sam Chuk Street, Ground Floor
San Po Kong, Kowloon
Hong Kong
TEL: [phone]
FAX: [phone]

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