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DS600 0.5 Accurate Analog-Output Temperature Sensor
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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 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 SOP package.
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 LowPower Standby Mode Exposed Pad 8-Pin SOP Package for Quick Thermal Response
APPLICATIONS
Cold-Junction Thermocouple Compensation Portable Medical Equipment Thermally Sensitive Systems that Require a HighAccuracy Analog-Output Temperature Sensor
ORDERING INFORMATION TYPICAL OPERATING CIRCUIT
PART DS600U DS600U/T&R TEMP RANGE -40C to +125C -40C to +125C PIN-PACKAGE 8 SOP 8 SOP Tape-and-Reel
2.7V to 5.5V DS600 VDD TO
TO VOUT
PIN CONFIGURATION
TOP VIEW
GND CTG SD VTH TO/FROM C VDD TO
TO VOUT
1 2 3 4 8 7 6 5
GND CTG SD VTH
EXPOSED PAD SOP
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 specifications 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.
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REV: 040804
DS600 0.5C Accurate Analog-Output Temperature Sensor
ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin (except CTG) Relative to Ground Voltage Range on CTG Relative to Ground Operating Temperature Range Storage Temperature Range Soldering Temperature (10s) Reflow Oven Temperature -0.5V to +6.0V -0.5 to +0.5V -40C to +125C -55C to +125C +260C (See IPC/JEDEC J-STD-020A) +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
(VCC = 2.7V to 5.5V, TA = -40C to +125C.) PARAMETER Supply Voltage Thermometer Error Output Gain VOUT DC Offset Low-Level Input Voltage (SD) High-Level Input Voltage (SD) SD Input Capacitance VTH Input Capacitance Low-Level Output Voltage (TO, TO) Supply Current Shutdown Current Input Current (VTH) Input Resistance (VTH) Leakage Current (SD) External Load Capacitance on VOUT VOUT Source Current VOUT Sink Current Output Impedance (VOUT) Power-Up Time Nonlinearity Comparator Offset Comparator Response Time tCOMP SYMBOL VDD TERR V/T VOS VIL VIH CSD CVTH VOL IDD ISD ITH RTH IL CEL IOSO IOSI ROUT tPOWERUP 10 10 100 10 0.2 3 20 5 0.01 1 50 0.01 4mA sink current 0 0C -0.5 0.7 x VDD 5 5 0.4 140 2.5 1 -20C to +100C -40C to +125C 6.45 509 0.3 x VDD VDD + 0.5 CONDITIONS MIN 2.7 TYP MAX 5.5 0.5 0.75 UNITS V C mV/C mV V V pF pF V A A A M A pF A A ms C mV ms
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DS600 0.5C Accurate Analog-Output Temperature Sensor
PIN DESCRIPTION
PIN 1 2 3 4 5 6 7 8 NAME VDD TO TO VOUT VTH SD CTG GND FUNCTION Supply Voltage. 2.7V to 5.5V Active-High Thermostat Output. Open-drain output transitions from low to high when the output voltage exceeds VTH. In shutdown mode, (SD = 1), TO is low. Active-Low Thermostat Output. Open-drain output transitions from high to low when the output voltage exceeds VTH. In shutdown mode, (SD = 1), TO is high. 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 VOUT crosses this voltage. (No on-chip hysteresis is present). 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. Must be connected to GND. Ground.
Figure 1. Block Diagram
2.7V to 5.5V VDD
TEMPERATURE SENSOR LEVEL-SHIFT BUFFER
VOUT
THERMOSTAT COMPARATOR
DS600
TO SD
CONTROL LOGIC
TO
GND
VTH
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, VOUT, 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 (VOS) of 509mV. Its operating temperature range is -40C to +125C, corresponding to an output voltage range of 251mV to 1315mV. (VOUT = Device Temperature (C) x V/T + VOS). 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.
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DS600 0.5C Accurate Analog-Output Temperature Sensor
Figure 2. Output Voltage Characteristic
DS600 OUTPUT CHARACTERISTIC
1.4 1
VOUT (V)
0.6 0.2 -40 -20 0 20 509mV 40 60 80 100 120
TEMPERATURE (C)
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 VTH pin. When the temperature with the equivalent voltage value is reached (voltage on VOUT = voltage on VTH), thermostat outputs TO and TO become active. Figure 3 shows an example thermostat application circuit.
Figure 3. Thermostat Application Circuit
2.7V to 5.5V 500 K DS600 VDD TO
TO VOUT
MAX6007A
GND CTG SD VTH
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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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
(c) 2004 Maxim Integrated Products * Printed USA

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