DS600 ±0.5 Accurate Analog-Output Temperature Sensor www.maxim-ic.com FEATURES 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. ±0.5°C Accuracy (-20°C to +100°C) ±0.75°C Accuracy Over Entire Temperature APPLICATIONS Exposed Pad 8-Pin µSOP Package for Quick 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 LowPower Standby Mode Cold-Junction Thermocouple Compensation Portable Medical Equipment Thermally Sensitive Systems that Require a HighAccuracy Analog-Output Temperature Sensor Thermal Response ORDERING INFORMATION TYPICAL OPERATING CIRCUIT PART DS600U TEMP RANGE -40°C to +125°C DS600U/T&R -40°C to +125°C PIN-PACKAGE 8 µSOP 8 µSOP Tape-and-Reel PIN CONFIGURATION 2.7V to 5.5V TOP VIEW DS600 VDD GND TO CTG VDD 1 8 GND TO VOUT SD VTH TO 2 7 CTG TO VOUT 3 6 4 5 SD VTH TO/FROM µC EXPOSED PAD µSOP 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. 1 of 4 REV: 040804 DS600 ±0.5°C 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 -40°C to +125°C -55°C to +125°C +260°C (See IPC/JEDEC J-STD-020A) +220°C 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 = -40°C to +125°C.) PARAMETER Supply Voltage Thermometer Error Output Gain SYMBOL CONDITIONS VDD TERR MIN TYP 2.7 -20°C to +100°C -40°C to +125°C ∆V/∆T 0°C MAX UNITS 5.5 ±0.5 ±0.75 V °C 6.45 mV/°C 509 mV VOUT DC Offset VOS Low-Level Input Voltage (SD) High-Level Input Voltage (SD) VIL VIH SD Input Capacitance CSD 5 pF VTH Input Capacitance Low-Level Output Voltage (TO, TO) Supply Current CVTH 5 pF -0.5 0.7 x VDD 0 V V 0.4 V IDD 140 µA Shutdown Current ISD 2.5 µA Input Current (VTH) ITH 1 µA Input Resistance (VTH) RTH VOL 4mA sink current 0.3 x VDD VDD + 0.5 0.01 5 Leakage Current (SD) External Load Capacitance on VOUT VOUT Source Current IOSO 10 µA VOUT Sink Current IOSI 10 µA Output Impedance (VOUT) Power-Up Time IL MΩ 0.01 CEL µA 50 pF ROUT 100 Ω tPOWERUP 10 ms ±0.2 °C ±3 mV 20 ms Nonlinearity Comparator Offset Comparator Response Time 1 tCOMP 2 of 4 DS600 ±0.5°C Accurate Analog-Output Temperature Sensor PIN DESCRIPTION PIN NAME 1 VDD 2 TO 3 TO 4 VOUT 5 VTH 6 SD 7 8 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 LEVEL-SHIFT BUFFER VDD TEMPERATURE SENSOR VOUT THERMOSTAT COMPARATOR DS600 TO SD CONTROL LOGIC TO VTH GND 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 -40°C to +125°C, corresponding to an output voltage range of 251mV to 1315mV. (VOUT = Device Temperature (°C) x ∆V/∆T + VOS). The DS600 has ±0.5°C accuracy over a -20°C to +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. 3 of 4 DS600 ±0.5°C Accurate Analog-Output Temperature Sensor Figure 2. Output Voltage Characteristic DS600 OUTPUT CHARACTERISTIC 1.4 VOUT (V) 1 0.6 509mV 0.2 -40 -20 0 20 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 KΩ MAX6007A DS600 VDD GND TO CTG TO VOUT SD VTH 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