Page 1
r
S
T
µ
www.maxim-ic.com
GENERAL DESCRIPTION
The DS600 is a ±0.5°C 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 -20°C to +100°C. The
DS600 can also act as a thermostat, with userprogrammable 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 µSOP package.
APPLICATIONS
Cold-Junction Thermocouple Compensation
Portable Medical Equipment
Thermally Sensitive Systems that Require a High-
Accuracy Analog-Output Temperature Sensor
TYPICAL OPERATING CIRCUIT
2.7V to 5.5V
DS600
DS600
±0.5 Accurate Analog-Output
Temperature Senso
FEATURES
±0.5°C Accuracy (-20°C to +100°C)
±0.75°C Accuracy Over Entire Temperature
Range of(-40°C to +125°C
Requires No External Components
6.45mV/°C Output Gain with 509mV Offset at
0°C
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 µSOP Package for Quick
Thermal Response
ORDERING INFORMATION
PART TEMP RANGE PIN-PACKAGE
DS600U -40°C to +125°C 8 µSOP
DS600U/T&R -40°C to +125°C
PIN CONFIGURATION
TOP VIEW
8 µSOP
Tape-and-Reel
VTH
OUT
GND
CTG
SD
TO/FROM
C
V
DD
2
3
EXPOSED PAD µSOP
V
TO
TO
OUT
GND
CTG
7
6
D
V
TH
.
REV: 040804
VDD
TO
O
V
DALLAS is a registered trademark of Dallas Semiconductor Corp.
MAXIM is a registered trademark of Maxim Integrated Products, Inc.
Note: Some revisions of this device may incorporate deviations from published spec ifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata
1 of 4
Page 2
DS600 ±0.5°C Accurate Analog-Output Temperature Sensor
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
Storage Temperature Range
Soldering Temperature (10s)
-40°C to +125°C
-55°C to +125°C
+260°C (See IPC/JEDEC J-STD-020A)
Reflow Oven Temperature +220°C
Stresses beyond those listed under “Abs olute Maximum Ratings” may caus e permanent damage to the device. Thes e are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in the operati onal sect ions of the specifications is
not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(VCC = 2.7V to 5.5V, TA = -40°C to +125°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage VDD 2.7 5.5 V
Thermometer Error T
Output Gain
V
DC Offset VOS 0°C 509 mV
OUT
ERR
∆V/∆T
Low-Level Input Voltage (SD) VIL -0.5 0.3 x VDD V
High-Level Input Voltage (SD) VIH 0.7 x VDD V
SD Input Capacitance CSD 5 pF
-20°C to +100°C ±0.5
-40°C to +125°C ±0.75
°C
6.45 mV/°C
+ 0.5 V
DD
VTH Input Capacitance C
Low-Level Output Voltage
TO)
(TO,
5 pF
VTH
4mA sink current 0 0.4 V
V
OL
Supply Current IDD 140 µA
Shutdown Current ISD 2.5 µA
Input Current (VTH) ITH 0.01 1 µA
Input Resistance (VTH) RTH 5 MΩ
Leakage Current (SD) IL 0.01 1 µA
External Load Capacitance
on V
V
V
Output Impedance (V
OUT
Source Current I
OUT
Sink Current I
OUT
) R
OUT
Power-Up Time t
50 pF
C
EL
10 µA
OSO
10 µA
OSI
100 Ω
OUT
POWERUP
10 ms
Nonlinearity ±0.2 °C
Comparator Offset ±3 mV
Comparator Response Time t
20 ms
COMP
2 of 4
Page 3
DS600 ±0.5°C Accurate Analog-Output Temperature Sensor
PIN DESCRIPTION
PIN NAME FUNCTION
1
2 TO
3
4
5
6 SD
7 CTG Must be connected to GND.
8 GND
V
TO
V
V
DD
OUT
TH
Supply Voltage. 2.7V to 5.5V
Active-High Thermostat Output. Open-drain output transitions from low to high when the output
voltage exceeds V
Active-Low Thermostat Output. Open-drain output transitions from high to low when the output
voltage exceeds V
Temperature Output. Outputs a voltage that is proportional to the die temperature in degrees
centigrade. In shutdown mode, this pin goes high-Z.
Thermostat Trip Voltage. User-selectable voltage that sets the thermostat trip-point temperature.
TO and TO are asserted when V
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.
Ground.
. In shutdown mode, (SD = 1), TO is low.
TH
. In shutdown mode, (SD = 1), TO is high.
TH
crosses this voltage. (No on-chip hysteresis is present).
OUT
Figure 1. Block Diagram
2.7V to 5.5V
V
TEMPERATURE
SENSOR
DS600
LEVEL-SHIFT
BUFFER
V
THERMOSTAT
COMPARATOR
SD
CONTROL
TO
TO
GND
V
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
characteristic is factory-calibrated for a typical output gain (∆V/∆T) of +6.45mV/°C and a DC offset (V
Its operating temperature range is -40°C to +125°C, corresponding to an output voltage range of 251mV to
1315mV. (V
= Device Temperature (°C) x ∆V/∆T + V
OUT
+100°C 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.
, that is proportional to degrees centigrade. The output voltage
OUT
) of 509mV.
OS
). The DS600 has ±0.5°C accuracy over a -20°C to
OS
3 of 4
Page 4
DS600 ±0.5°C Accurate Analog-Output Temperature Sensor
T
Figure 2. Output Voltage Characteristic
DS600 OUTPUT CHARACTERISTIC
1.4
1
(V)
0.6
OUT
V
509mV
0.2
-20
TEMPERATURE (°C)
800 100 -40 120 604020
THERMOSTAT OPERATION
The DS600 can also be used as a thermostat with either an active-high (TO) or active-low (
as a thermostat, a precise voltage reference equal to the desired threshold must be applied to the V
the temperature with the equivalent voltage value is reached (voltage on V
TO and
TO become active. Figure 3 shows an example thermostat application circuit.
= voltage on VTH), thermostat outputs
OUT
Figure 3. Thermostat Application Circuit
2.7V to 5.5V
500 KΩ MAX6007A
TO) output. To function
pin. When
TH
DS600
OUT
GND
CTG
SD
V
TH
V
DD
TO
O
V
4 of 4
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2004 Maxim Integrated Products • Printed USA
Loading...