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) ........................... – 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
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 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 gen-
eral 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 25
°
C
250mV
250mV
750mV
750mV
Part No.
V
CC
= 2.2V to 12V
MICROCONTROLLER
V
CC
A/D
CONVERTER
Package
8-Pin SOIC
8-Pin MSOP
8-Pin SOIC
8-Pin MSOP
Temp. Range
– 20°C to +100°C
– 20°C to +100°C
– 20°C to +125°C
– 20°C to +125°C
TC1023VOA
TC1023VUA
TC1024VOA
TC1024VUA
V
OUT
TC1023
GND
CE
PIN CONFIGURATION
8-Pin SOIC
I/O LINE
V
OUT
NC
NC
GND
1
2
3
4
TC1023VOA
TC1024VOA
8
7
6
5
VCC
NC
NC
CE
V
OUT
NC
NC
GND
1
2
3
4
TC1023VUA
TC1024VUA
MSOP-8
8
7
6
5
V
CC
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 (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
* 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.
ELECTRICAL CHARACTERISTICS :
T
A
= – 20°C to +125°C
,
V
CC
= 5V
±5%,
GND = 0V, unless otherwise specified.
Symbol
V
CC
I
S
I
CE
V
IH
V
IL
I
CE
t
REC
V
OUT
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
V
OUT
Output Voltage (TC1024)
V
OUT
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
µA
µA
V
V
µA
µsec
mV
CE = V
IL
(Note 1)
CE = V
IH
(Note 2)
CE = V
IH
or V
IL
CE = step from V
IH
to V
IL
(Note 3)
T
A
= – 20°C and +125°C
T
A
= – 20°C and +100°C
Circuit per Figure 1:
R1 = 240kΩ
V
SS
= – 12V
(Note 1)
T
A
= +25°C
(Note 4)
TC1023: T
A
= – 20°C
TC1024: T
A
= – 20°C
(Note 4)
TC1023: T
A
= +100°C
TC1024: T
A
= +125°C
(Note 4)
Note 5
I
SRC
V
OUT
Output Source Current
Accuracy at Room Temperature
Accuracy at Minimum Temperature
—
–2
–4
—
—
—
1.0
+2
+4
mA
°C
°C
°C
°C
µV/V
mV/°C
V
Accuracy at Maximum Temperature
–3
—
+3
A
V
V
OUTMAX
Nonlinearity
Line Regulation
Average Slope of Output Voltage
Maximum Output Voltage
TC1023: 2.2V
≤
V
CC
≤
12V
TC1024: 3.0V
≤
V
CC
≤
12V
(Note 1)
– 0.8
—
—
—
—
80
10
—
+0.8
—
—
V
CC
– 1.2
NOTES:
1. V
OUT
outputs open circuited.
2. V
OUT
is 0V through approximately 100kΩ 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.
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 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 = V
SS
/50µA).
V
CC
= 3.0V to 12.0V
V
CC
V
OUT
CE
TC1024
GND
V
OUT
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) 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 0.1µF bypass capacitor from V
CC
to GND is recom-
mended.
TC1024 (– 20°C to +125°C)
Figure 2. TC1024 Connections
V
CC
2.5V
REF
V
CC
V
OUT
TC102x
CE
GND
R1
CMOS
GATE
A/D
CONVERTER
Shutdown/Calibrate Mode
The TC1023/1024 enters shutdown when the CE input
is taken to V
IH
. 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 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
).
V
CC
= 2.2V to 12.0V MIN.
V
CC
CAL
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.
MICROCONTROLLER
A/D
CONVERTER
V
CC
V
OUT
CE
TC1023
GND
R1 = V
SS
/50µA
V
OUT
Zone 1
V
CC
V
OUT
TC102x
CE
GND
Zone 2
V
CC
V
OUT
TC102x
CE
GND
Zone 1/Zone 2
I/O Pin
V
SS
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)
8°MAX.
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)
6°MAX.
.028 (0.70)
.016 (0.40)
.008 (0.20)
.005 (0.13)
Dimensions: inches (mm)
TC1023/1024-05
6/12/97
5
京公网安备 11010802033920号
EEWORLD
