Document Outline
- Return to Contents
- List of Figures
- 1. TC1023 Connections
- 2. TC1024 Connections
- 3. A/D Calibration
- 4. TC1023/1024 Addressing
- 5. Output Voltage vs. Temperature
- Features
- Applications
- Typical Application
- General Description
- Ordering Information
- Pin Configurations
- Absolute Maximum Ratings
- Electrical Characteristics
- Detailed Description
- Output Stage
- Shutdown/Calibrate Mode
- Multi-Zone Temperature Sensing
- Package Dimensions
- Sales Offices
1
TC1023
TC1024
PRELIMINARY INFORMATION
TC1023/1024-05 6/12/97
PRECISION TEMPERATURE-TO-VOLTAGE
CONVERTERS WITH SHUTDOWN MODE
TC1023
TC1024
TYPICAL APPLICATION
Output
Voltage
Part No.
Package
At 25
C
Temp. Range
TC1023VOA
8-Pin SOIC
250mV
20
C to +100
C
TC1023VUA
8-Pin MSOP
250mV
20
C to +100
C
TC1024VOA
8-Pin SOIC
750mV
20
C to +125
C
TC1024VUA
8-Pin MSOP
750mV
20
C to +125
C
PIN CONFIGURATION
PRECISION TEMPERATURE-TO-VOLTAGE CONVERTERS
WITH SHUTDOWN MODE
FEATURES
s
Linearized Temperature-to-Voltage Converters
s
Direct Centigrade Output Voltage Scaling (TC1023)
s
Shutdown/Calibrate Mode
s
Multi-Zone Temperature Sensing Capability
s
Wide Temperature Measurement
Range (TC1024) ........................... 20
C to +125
C
s
Excellent Temperature Converter Linearity .. 0.8
C
Over Temperature
s
High Temperature Converter Accuracy .........
2
C
at 25
C Guaranteed
s
Small Packages ......... 8-Pin SOIC and 8-Pin MSOP
APPLICATIONS
s
Power Supply Thermal Shut-Down
s
Temperature-Controlled Fans
s
Temperature Measurement/Instrumentation
s
Temperature Regulators
s
Consumer Electronics
s
Lithium Battery Temperature Monitor
GENERAL DESCRIPTION
The TC1023/1024 temperature sensors furnish a lin-
earized output voltage directly proportional to measured
temperature. The TC1023 has a temperature measure-
ment 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 resis-
tor 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 1
A (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 gen-
eral purpose temperature measurement applications.
V
OUT
NC
NC
GND
8
7
6
5
1
2
3
4
VCC
NC
NC
CE
V
OUT
NC
NC
GND
NC
NC
V
CC
CE
1
8
2
7
3
6
4
5
TC1023VOA
TC1024VOA
TC1023VUA
TC1024VUA
TC1023
I/O LINE
V
CC
= 2.2V to 12V
V
OUT
V
CC
GND
CE
MICROCONTROLLER
A/D
CONVERTER
8-Pin SOIC
MSOP-8
ORDERING INFORMATION
TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.
2
TC1023
TC1024
PRECISION TEMPERATURE-TO-VOLTAGE
CONVERTERS WITH SHUTDOWN MODE
PRELIMINARY INFORMATION
TC1023/1024-05 6/12/97
ELECTRICAL CHARACTERISTICS :
T
A
= 20
C to +125
C
,
V
CC
= 5V
5%,
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
--
40
60
A
(Note 1)
I
CE
Shutdown Current
CE = V
IH
--
1
5
A
(Note 2)
V
IH
CE Input Logic HIGH Level
2.0
--
--
V
V
IL
CE Input Logic LOW Level
--
--
0.8
V
I
CE
CE Input Leakage Current
CE = V
IH
or V
IL
1
--
+1
A
t
REC
Recovery Time from Shutdown
CE = step from V
IH
to V
IL
--
400
--
sec
(Note 3)
V
OUT
V
OUT
Output Voltage (TC1024)
T
A
= 20
C and +125
C
270
--
1780
mV
V
OUT
Output Voltage (TC1023)
T
A
= 20
C and +100
C
230
--
1030
Circuit per Figure 1:
R1 = 240k
V
SS
= 12V
(Note 1)
I
SRC
V
OUT
Output Source Current
--
--
1.0
mA
Accuracy at Room Temperature
T
A
= +25
C
2
--
+2
C
(Note 4)
Accuracy at Minimum Temperature
TC1023: T
A
= 20
C
4
--
+4
C
TC1024: T
A
= 20
C
(Note 4)
Accuracy at Maximum Temperature
TC1023: T
A
= +100
C
3
--
+3
C
TC1024: T
A
= +125
C
(Note 4)
Nonlinearity
Note 5
0.8
--
+0.8
C
Line Regulation
--
80
--
V/V
A
V
Average Slope of Output Voltage
--
10
--
mV/
C
V
OUTMAX
Maximum Output Voltage
TC1023: 2.2V
V
CC
12V
--
--
V
CC
1.2
V
TC1024: 3.0V
V
CC
12V
(Note 1)
* 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 perma-
nent 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.
ABSOLUTE MAXIMUM RATINGS *
Supply Voltage ............................................................ 15V
Input Voltage, Any Terminal .............. 1.0 to (V
CC
+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
NOTES: 1. V
OUT
outputs open circuited.
2. V
OUT
is 0V through approximately 100k
to ground when CE = V
IH
.
3. Recovery time is the period required for V
OUT
to rise from 0V (shutdown state) to the voltage corresponding to the measured
temperature driving a 100pF capacitive load.
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.
3
TC1023
TC1024
PRELIMINARY INFORMATION
TC1023/1024-05 6/12/97
PRECISION TEMPERATURE-TO-VOLTAGE
CONVERTERS WITH SHUTDOWN MODE
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
50
A (i.e., R1 = V
SS
/50
A).
Figure 1. TC1023 Connections
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 2k
(or greater) resis-
tor should be placed in series with the output for decoupling.
If the TC1023/1024 is used in a noisy electrical environ-
ment, a 0.1
F bypass capacitor from V
CC
to GND is recom-
mended.
Shutdown/Calibrate Mode
The TC1023/1024 enters shutdown when the CE input
is taken to V
IH
. This causes quiescent current to fall to 1
A
(typ) and the output to drop immediately to 0V through
approximately 100k
. For applications where the TC1023/
1024 is connected to an external A/D converter, a refer-
ence voltage can be directly connected to V
OUT
while in
shutdown for A/D calibration, as shown in Figure 3. A
CMOS gate provides bias voltage to the bandgap refer-
ence V
R
, and at the same time disables the TC102x by
taking CE to V
IH
. Limiting resistor R1 should be chosen to
limit current through the voltage reference to the desired
current (I
REF
). That is, R1 = (V
OH
V
REF
)/I
REF
(where V
OH
is the CMOS gate output high voltage at output current
equal to I
REF
; and V
REF
is the reference voltage of V
R
).
Figure 2. TC1024 Connections
Figure 3. A/D Calibration
Multi-Zone Temperature Sensing
The CE input facilitates multi-zone temperature sens-
ing 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
OUT
pins are connected together
and routed to the processor's A/D converter, eliminating
the need for separate A/D input channels for each sensor.
Figure 4. TC1023/1024 Addressing
TC1023
GND
CE
V
CC
= 2.2V to 12.0V MIN.
V
CC
V
OUT
V
SS
R1 = V
SS
/50
A
V
OUT
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
TC102x
GND
R1
CE
V
CC
V
CC
CAL
A/D
CONVERTER
CMOS
GATE
2.5V
REF
V
OUT
TC1024
GND
TC1024 ( 20
C to +125
C)
V
CC
= 3.0V to 12.0V
V
CC
V
OUT
CE
V
OUT
4
TC1023
TC1024
PRECISION TEMPERATURE-TO-VOLTAGE
CONVERTERS WITH SHUTDOWN MODE
PRELIMINARY INFORMATION
TC1023/1024-05 6/12/97
Figure 5. Output Voltage vs. Temperature
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.1
0.2
40
V
OUT
(VOLTS)
TEMPERATURE (
C)
30
20
10
0
10
20
30
40
50
60
70
80
90
100
110
120
130
TC1024
TC1023
TC1023: VOUT = (10mV/
C) (Temperature
C)
TC1024: VOUT = (10mV/
C) (Temperature
C) + 500mV
5
TC1023
TC1024
PRELIMINARY INFORMATION
TC1023/1024-05 6/12/97
PRECISION TEMPERATURE-TO-VOLTAGE
CONVERTERS WITH SHUTDOWN MODE
Dimensions: inches (mm)
.122 (3.10)
.114 (2.90)
.122 (3.10)
.114 (2.90)
.043 (1.10)
MAX.
.006 (0.15)
.002 (0.05)
.016 (0.40)
.010 (0.25)
.197 (5.00)
.187 (4.80)
PIN 1
.008 (0.20)
.005 (0.13)
.028 (0.70)
.016 (0.40)
6
MAX.
.026 (0.65) TYP.
8-Pin MSOP
PACKAGE DIMENSIONS
8-Pin SOIC
.050 (1.27) TYP.
8
MAX.
PIN 1
.244 (6.20)
.228 (5.79)
.157 (3.99)
.150 (3.81)
.197 (5.00)
.189 (4.80)
.018 (0.46)
.014 (0.36)
.010 (0.25)
.004 (0.10)
.069 (1.75)
.053 (1.35)
.010 (0.25)
.007 (0.18)
.050 (1.27)
.016 (0.40)
6
TC1023
TC1024
PRECISION TEMPERATURE-TO-VOLTAGE
CONVERTERS WITH SHUTDOWN MODE
PRELIMINARY INFORMATION
TC1023/1024-05 6/12/97
Sales Offices
TelCom Semiconductor
1300 Terra Bella Avenue
P.O. Box 7267
Mountain View, CA 94039-7267
TEL: 415-968-9241
FAX: 415-967-1590
E-Mail: liter@c2smtp.telcom-semi.com
Printed in the U.S.A.
TelCom Semiconductor
Austin Product Center
9101 Burnet Rd. Suite 214
Austin, TX 78758
TEL: 512-873-7100
FAX: 512-873-8236
TelCom Semiconductor H.K. Ltd.
10 Sam Chuk Street, Ground Floor
San Po Kong, Kowloon
Hong Kong
TEL: 852-2324-0122
FAX: 852-2354-9957
PDF 
ZIP