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REV: 040804
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
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.
GENERAL DESCRIPTION
The DS600 is a 0.5C accurate analog-output
temperature sensor. This accuracy is valid over its
entire operating voltage range of 2.7V to 5.5V and
the wide temperature range of -20C to +100C. The
DS600 can also act as a thermostat, with user-
programmable trip points. A shutdown mode enables
the DS600 to be placed in a low-power standby state.
The DS600 is available in an 8-pin SOP package.
APPLICATIONS
Cold-Junction Thermocouple Compensation
Portable Medical Equipment
Thermally Sensitive Systems that Require a High-
Accuracy Analog-Output Temperature Sensor
TYPICAL OPERATING CIRCUIT
FEATURES
0.5C Accuracy (-20C to +100C)
0.75C Accuracy Over Entire Temperature
Range of(-40C to +125C
Requires No External Components
6.45mV/C Output Gain with 509mV Offset at
0C
2.7V to 5.5V Supply Voltage Range
User-Programmable Thermostat Function
Shutdown Function Puts Device into a Low-
Power Standby Mode
Exposed Pad 8-Pin SOP Package for Quick
Thermal Response
ORDERING INFORMATION
PART TEMP
RANGE
PIN-PACKAGE
DS600U
-40C to +125C
8 SOP
DS600U/T&R
-40C to +125C
8 SOP
Tape-and-Reel
PIN CONFIGURATION
DS600
0.5 Accurate Analog-Output
Temperature Sensor
www.maxim-ic.com
TOP VIEW
6
8
7
5
3
1
2
4
V
DD
TO
TO
V
OUT
GND
CTG
SD
V
TH
EXPOSED PAD SOP
V
DD
GND
TO
TO
V
OUT
V
TH
SD
CTG
2.7V to 5.5V
TO/FROM
C
DS600
DALLAS is a registered trademark of Dallas Semiconductor Corp.
MAXIM is a registered trademark of Maxim Integrated Products, Inc.
DS600 0.5C Accurate Analog-Output Temperature Sensor
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ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin (except CTG) Relative to Ground
-0.5V to +6.0V
Voltage Range on CTG Relative to Ground
-0.5 to +0.5V
Operating Temperature Range
-40C to +125C
Storage Temperature Range
-55C to +125C
Soldering Temperature (10s)
+260C (See IPC/JEDEC J-STD-020A)
Reflow Oven Temperature
+220C
Stresses beyond 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 beyond those indicated in the operational sections of the specifications is
not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 2.7V to 5.5V, T
A
= -40C to +125C.)
PARAMETER SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage
V
DD
2.7
5.5
V
-20C to +100C
0.5
Thermometer Error
T
ERR
-40C to +125C
0.75
C
Output Gain
V/
T
6.45
mV/C
V
OUT
DC Offset
V
OS
0C
509
mV
Low-Level Input Voltage (SD)
V
IL
-0.5
0.3 x V
DD
V
High-Level Input Voltage (SD)
V
IH
0.7 x V
DD
V
DD
+ 0.5
V
SD Input Capacitance
C
SD
5
pF
VTH Input Capacitance
C
VTH
5
pF
Low-Level Output Voltage
(TO,
TO)
V
OL
4mA sink current
0
0.4
V
Supply Current
I
DD
140
A
Shutdown Current
I
SD
2.5
A
Input Current (V
TH
) I
TH
0.01
1
A
Input Resistance (V
TH
) R
TH
5
M
Leakage Current (SD)
I
L
0.01
1
A
External Load Capacitance
on V
OUT
C
EL
50
pF
V
OUT
Source Current
I
OSO
10
A
V
OUT
Sink Current
I
OSI
10
A
Output Impedance (V
OUT
) R
OUT
100
Power-Up Time
t
POWERUP
10
ms
Nonlinearity
0.2
C
Comparator Offset
3
mV
Comparator Response Time
t
COMP
20
ms
DS600 0.5C Accurate Analog-Output Temperature Sensor
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PIN DESCRIPTION
PIN NAME
FUNCTION
1
V
DD
Supply Voltage.
2.7V to 5.5V
2 TO
Active-High Thermostat Output.
Open-drain output transitions from low to high when the output
voltage exceeds V
TH
. In shutdown mode, (SD = 1), TO is low.
3
TO
Active-Low Thermostat Output.
Open-drain output transitions from high to low when the output
voltage exceeds V
TH
. In shutdown mode, (SD = 1),
TO is high.
4
V
OUT
Temperature Output.
Outputs a voltage that is proportional to the die temperature in degrees
centigrade. In shutdown mode, this pin goes high-Z.
5
V
TH
Thermostat Trip Voltage.
User-selectable voltage that sets the thermostat trip-point temperature.
TO and
TO are asserted when V
OUT
crosses this voltage. (No on-chip hysteresis is present).
6 SD
Shutdown.
Power consumption and thermal sensor function are controlled through SD. This pin
functions as an active-high input pin. Driving this pin high puts the device in a low-power state and
discontinues thermal sensing.
7
CTG
Must be connected to GND.
8 GND
Ground.
Figure 1. Block Diagram
TEMPERATURE MEASUREMENT
The DS600 analog temperature sensor measures it own temperature and provides these measurements to the
user in the form of an output voltage, V
OUT
, that is proportional to degrees centigrade. The output voltage
characteristic is factory-calibrated for a typical output gain (
V/
T) of +6.45mV/C and a DC offset (V
OS
) of 509mV.
Its operating temperature range is -40C to +125C, corresponding to an output voltage range of 251mV to
1315mV. (V
OUT
= Device Temperature (C) x
V/
T + V
OS
). The DS600 has 0.5C accuracy over a -20C to
+100C temperature range and over the full 2.7V to 5.5V voltage range. Because the output voltage is positive for
the entire temperature range, there is no need for a negative supply.
Figure 2 shows the output voltage characteristic for the DS600.
TEMPERATURE
SENSOR
V
OUT
V
TH
TO
TO
SD
V
DD
GND
CONTROL
LOGIC
LEVEL-SHIFT
BUFFER
THERMOSTAT
COMPARATOR
2.7V to 5.5V
DS600
DS600 0.5C Accurate Analog-Output Temperature Sensor
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Maxim/Dallas Semiconductor cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim/Dallas Semiconductor product.
No circuit patent licenses are implied. Maxim/Dallas Semiconductor reserves the right to change the circuitry and specifications without notice at any time.
Ma xi m I nt e gr at e d Pr o du ct s, 1 2 0 S a n G abr i el Dr i ve, S un n yv al e, C A 94 0 8 6 40 8- 7 37- 7 60 0
2004 Maxim Integrated Products
Printed USA
Figure 2. Output Voltage Characteristic
THERMOSTAT OPERATION
The DS600 can also be used as a thermostat with either an active-high (TO) or active-low (
TO) output. To function
as a thermostat, a precise voltage reference equal to the desired threshold must be applied to the V
TH
pin. When
the temperature with the equivalent voltage value is reached (voltage on V
OUT
= voltage on V
TH
), thermostat outputs
TO and
TO become active. Figure 3 shows an example thermostat application circuit.
Figure 3. Thermostat Application Circuit
80
0
100
-40 120
60
40
20
-20
0.2
0.6
1
1.4
DS600 OUTPUT CHARACTERISTIC
TEMPERATURE (C)
V
OU
T
(V
)
509mV
V
DD
GND
TO
TO
V
OUT
V
TH
SD
CTG
500 K
MAX6007A
DS600
2.7V to 5.5V
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