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PRECISION TEMPERATURE-TO-VOLTAGE CONVERTERS WITH SHUTDOWN MODE
PRELIMINARY INFORMATION
TC1023 TC1023 TC1024 TC1024 PRECISION TEMPERATURE-TO-VOLTAGE CONVERTERS WITH SHUTDOWN MODE
FEATURES
s s s s s s s s Linearized Temperature-to-Voltage Converters Direct Centigrade Output Voltage Scaling (TC1023) Shutdown/Calibrate Mode Multi-Zone Temperature Sensing Capability Wide Temperature Measurement Range (TC1024) ........................... - 20C to +125C Excellent Temperature Converter Linearity .. 0.8C Over Temperature High Temperature Converter Accuracy ......... 2C at 25C Guaranteed Small Packages ......... 8-Pin SOIC and 8-Pin MSOP
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 - 20C to +100C. 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 0C. The TC1024 has a temperature measurement range of - 20C to +125C, 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 - 20C to 1,750mV at +125C. Both devices have a chip enable input that reduces supply current to 1A (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.
APPLICATIONS
s s s s s s Power Supply Thermal Shut-Down Temperature-Controlled Fans Temperature Measurement/Instrumentation Temperature Regulators Consumer Electronics Lithium Battery Temperature Monitor
TYPICAL APPLICATION
ORDERING INFORMATION
Output Voltage At 25C 250mV 250mV 750mV 750mV
Part No.
VCC = 2.2V to 12V MICROCONTROLLER VCC A/D CONVERTER
Package 8-Pin SOIC 8-Pin MSOP 8-Pin SOIC 8-Pin MSOP
Temp. Range - 20C to +100C - 20C to +100C - 20C to +125C - 20C to +125C
TC1023VOA TC1023VUA TC1024VOA TC1024VUA
VOUT
TC1023 GND CE
PIN CONFIGURATION 8-Pin SOIC
I/O LINE
VOUT NC NC GND 1 2 3 4 TC1023VOA TC1024VOA 8 7 6 5 VCC NC NC CE VOUT NC NC GND 1 2 3 4 TC1023VUA TC1024VUA
MSOP-8
8 7 6 5 VCC NC NC CE
TC1023/1024-05
6/12/97
TelCom Semiconductor reserves the right to make changes in the circuitry and 1 specifications of its devices.
PRELIMINARY INFORMATION
PRECISION TEMPERATURE-TO-VOLTAGE CONVERTERS WITH SHUTDOWN MODE
TC1023 TC1024
ABSOLUTE MAXIMUM RATINGS *
Supply Voltage ............................................................15V Input Voltage, Any Terminal .............. - 1.0 to (VCC +0.3V) Operating Temperature (TC1023) ......... - 20C to +100C Operating Temperature (TC1024) ......... - 20C to +125C Storage Temperature ............................ - 55C to +150C Lead Temperature (Soldering, 10 sec) ................. +300C
* 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 = - 20C to +125C, VCC = 5V 5%, GND = 0V, unless otherwise specified.
Symbol VCC IS ICE VIH VIL ICE tREC VOUT Parameter Supply Voltage (TC1023) (TC1024) Supply Current Shutdown Current CE Input Logic HIGH Level CE Input Logic LOW Level CE Input Leakage Current Recovery Time from Shutdown VOUT Output Voltage (TC1024) VOUT Output Voltage (TC1023) Test Conditions Min 2.2 3.0 -- -- 2.0 -- -1 -- 270 - 230 Typ -- -- 40 1 -- -- -- 400 -- -- Max 12 12 60 5 -- 0.8 +1 -- 1780 1030 Unit V A A V V A sec mV
CE = VIL (Note 1) CE = VIH (Note 2)
CE = VIH or VIL CE = step from VIH to VIL (Note 3) TA = - 20C and +125C TA = - 20C and +100C Circuit per Figure 1: R1 = 240k VSS = - 12V (Note 1) TA = +25C (Note 4) TC1023: TA = - 20C TC1024: TA = - 20C (Note 4) TC1023: TA = +100C TC1024: TA = +125C (Note 4) Note 5
ISRC
VOUT Output Source Current Accuracy at Room Temperature Accuracy at Minimum Temperature
-- -2 -4
-- -- --
1.0 +2 +4
mA C C C C V/V mV/C V
Accuracy at Maximum Temperature
-3
--
+3
AV VOUTMAX
Nonlinearity Line Regulation Average Slope of Output Voltage Maximum Output Voltage
TC1023: 2.2V VCC 12V TC1024: 3.0V VCC 12V (Note 1)
- 0.8 -- -- --
-- 80 10 --
+0.8 -- -- VCC - 1.2
NOTES: 1. VOUT outputs open circuited. 2. VOUT is 0V through approximately 100k to ground when CE = VIH. 3. Recovery time is the period required for VOUT 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.
TC1023/1024-05 6/12/97
2
PRECISION TEMPERATURE-TO-VOLTAGE 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 0C to 100C. 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 0C. The value of the resistor must be chosen to limit the maximum current pulled from the output to the negative supply to - 50A (i.e., R1 = VSS/50A).
VCC = 3.0V to 12.0V
VCC VOUT CE TC1024 GND VOUT
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) resistor should be placed in series with the output for decoupling. If the TC1023/1024 is used in a noisy electrical environment, a 0.1F bypass capacitor from VCC to GND is recommended.
TC1024 (- 20C to +125C)
Figure 2. TC1024 Connections
VCC
2.5V REF
VCC VOUT TC102x CE GND R1 CMOS GATE A/D CONVERTER
Shutdown/Calibrate Mode
The TC1023/1024 enters shutdown when the CE input is taken to VIH. This causes quiescent current to fall to 1A (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 reference voltage can be directly connected to VOUT while in 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 (IREF). That is, R1 = (VOH - VREF)/IREF (where VOH is the CMOS gate output high voltage at output current equal to IREF; and VREF is the reference voltage of VR).
VCC = 2.2V to 12.0V MIN.
VCC
CAL
Figure 3. A/D Calibration
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 VOUT 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.
MICROCONTROLLER A/D CONVERTER
VCC VOUT CE TC1023 GND R1 = VSS /50A VOUT
Zone 1 VCC VOUT TC102x CE GND
Zone 2 VCC VOUT TC102x CE GND
Zone 1/Zone 2
I/O Pin
VSS
Figure 1. TC1023 Connections
TC1023/1024-05 6/12/97
Figure 4. TC1023/1024 Addressing 3
PRELIMINARY INFORMATION
PRECISION TEMPERATURE-TO-VOLTAGE CONVERTERS WITH SHUTDOWN MODE
TC1023 TC1024
1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1
VOUT (VOLTS)
TC1023: VOUT = (10mV/C) (Temperature C) TC1024: VOUT = (10mV/C) (Temperature C) + 500mV
1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
TC1024
TC1023
- 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 5. Output Voltage vs. Temperature
TC1023/1024-05 6/12/97
4
PRECISION TEMPERATURE-TO-VOLTAGE CONVERTERS WITH SHUTDOWN MODE
PRELIMINARY INFORMATION
TC1023 TC1024
PACKAGE DIMENSIONS 8-Pin SOIC
PIN 1
.157 (3.99) .150 (3.81)
.244 (6.20) .228 (5.79)
.050 (1.27) TYP.
.197 (5.00) .189 (4.80) .069 (1.75) .053 (1.35) .018 (0.46) .010 (0.25) .014 (0.36) .004 (0.10) .010 (0.25) .007 (0.18) .050 (1.27) .016 (0.40)
8MAX.
8-Pin MSOP
PIN 1
.122 (3.10) .114 (2.90)
.197 (5.00) .187 (4.80)
.026 (0.65) TYP.
.122 (3.10) .114 (2.90) .043 (1.10) MAX. .016 (0.40) .010 (0.25) .006 (0.15) .002 (0.05)
6MAX. .028 (0.70) .016 (0.40)
.008 (0.20) .005 (0.13)
Dimensions: inches (mm)
TC1023/1024-05 6/12/97
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PRELIMINARY INFORMATION
PRECISION TEMPERATURE-TO-VOLTAGE CONVERTERS WITH SHUTDOWN MODE
TC1023 TC1024
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
TC1023/1024-05 6/12/97
TelCom Semiconductor Austin Product Center 9101 Burnet Rd. Suite 214 Austin, TX 78758 TEL: 512-873-7100 FAX: 512-873-8236 6
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
Printed in the U.S.A.

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