19-2457; Rev 2; 11/03 Precision, Low-Power, 6-Pin SOT23 Temperature Sensors and Voltage References The MAX6610/MAX6611 are available in two versions. The MAX6611 operates from a 4.5V to 5.5V power supply and has a 4.096V reference output. The MAX6610 operates from 3.0V to 5.5V and has a 2.560V reference output. Power-supply current is less than 150µA (typ). Both the MAX6610/MAX6611 are available in a 6-pin SOT23 package and operate from -40°C to +125°C. Features ♦ ±1°C Accuracy ♦ Low TC Reference (±10ppm, typ) ♦ Temperature Output Scaled for ADCs ♦ Integrated Reference Voltage Scaled for Convenient ADC Bit Weights ♦ No Calibration Required ♦ Low Supply Current ♦ Tiny 6-Pin SOT23 Package ♦ Low-Current Shutdown Mode Ordering Information Applications System Temperature Monitoring TEMP RANGE PART Temperature Compensation HVAC Home Appliances PINVREF PACKAGE (V) TOP MARK MAX6610AUT-T -40°C to +125°C 6 SOT23-6 2.560 ABDO MAX6611AUT-T -40°C to +125°C 6 SOT23-6 4.096 ABOP Pin Configuration Typical Application Circuit VCC TOP VIEW VCC VCC 1 6 GND SHDN GND 2 MAX6610 MAX6611 5 REF µC MAX6610 MAX6611 VCC REF IN REF 0.1µF ADC IN TEMP SHDN 3 4 TEMP 1nF GND 1nF GND SOT23 GND ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX6610/MAX6611 General Description The MAX6610/MAX6611 are precise, low-power analog temperature sensors combined with a precision voltage reference. They are ideal for applications involving analog-to-digital converters (ADCs), where the MAX6610/ MAX6611 provide the reference voltage for the ADC and develop a temperature output voltage that is scaled to provide convenient ADC output codes. An 8bit ADC’s LSB is equal to 1°C, while a 10-bit ADC’s LSB corresponds to 0.25°C. MAX6610/MAX6611 Precision, Low-Power, 6-Pin SOT23 Temperature Sensors and Voltage References ABSOLUTE MAXIMUM RATINGS Operating Temperature Range (TMIN, TMAX) ....-40°C to +125°C ESD Protection (all pins, Human Body Model) ..................2000V Storage Temperature Range ............................-65°C to +150°C Junction Temperature ......................................................+150°C Lead Temperature (soldering, 10s) ................................+300°C Voltages Referenced to GND VCC ........................................................................-0.3V to +6.0V All Other Pins............................................. -0.3V to (VCC + 0.3V) Input Current ...................................................................... 20mA Output Current ....................................................................20mA Continuous Power Dissipation (TA = +70°C) 6-Pin SOT23 (derate 8.7mW/°C above +70°C) ........695.7mW 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 absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VCC = 3.0 to 5.5V (MAX6610), VCC = 4.5V to 5.5V (MAX6611), TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5.0V (MAX6611) and VCC = 3.3V (MAX6610), TA = +25°C.) (Note 1) PARAMETER Supply Current SYMBOL ICC Temperature Sensor Error Temperature Sensor Output Voltage VTEMP Temperature Sensor Nonlinearity Temperature Sensor Output Slope TYP MAX Outputs unloaded CONDITIONS MIN 150 250 SHDN = 0 0.2 1 TA = +25°C -1.2 +1.2 TA = -10°C to +55°C (Note 2) -2.4 +2.4 TA = -20°C to +85°C (Note 2) -3.7 +3.7 TA = -40°C to +125°C (Note 2) -5.0 +5.0 MAX6611, TA = 0°C 1.200 MAX6610, TA = 0°C 0.750 TA = -10°C to +80°C 1 MAX6611 16 MAX6610 10 mV/°C Temperature Sensor Load Regulation Sourcing: 0 ≤ IOUT ≤ 500µA -1 Sinking: -100µA ≤ IOUT ≤ 0 -2.5 +5 0 0.2 No sustained oscillations (Note 3) Temperature Sensor Long-Term Stability TA = +50°C for 1000hr Reference Output Voltage VREF Voltage Reference Temperature Coefficient ±0.1 Voltage Reference Long-Term Stability ∆VOUT/ time °C/mA µF °C 4.076 4.096 4.116 2.547 2.560 2.573 -50 ±10 +50 ppm/°C +1 mV/V -1 ∆VOUT/ ∆IOUT +1 °C/V MAX6610, TA = +25°C Voltage Reference Line Regulation 2 0.5 MAX6611, TA = +25°C TA = -40°C to +85°C Voltage Reference Load Regulation °C °C 3.0V ≤ VCC ≤ 5.5V for MAX6610 and 4.5V ≤ VCC ≤ 5.5V for MAX6611 Temperature Sensor Capacitive Load µA V Temperature Sensor Supply Sensitivity -2.5 UNITS Sourcing: 0 ≤ IOUT ≤ 1mA 1 2 Sinking: -200µA ≤ IOUT ≤ 0 4 20 1000h at TA = +25°C 50 _______________________________________________________________________________________ V Ω ppm Precision, Low-Power, 6-Pin SOT23 Temperature Sensors and Voltage References (VCC = 3.0 to 5.5V (MAX6610), VCC = 4.5V to 5.5V (MAX6611), TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5.0V (MAX6611) and VCC = 3.3V (MAX6610), TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS f = 0.1Hz to 10Hz 100 µVP-P f = 10Hz to 10kHz 100 µVP-P Turn-On Settling Time (VCC to REF) VCC = 0 to 5V step, CLOAD = 50pF, VREF = 0.1% of final value 300 µs Turn-On Settling Time (VCC to TEMP) VCC = 0 to 5V step, CLOAD = 50pF, VTEMP = 1°C of final value 500 µs Turn-On Settling Time (SHDN to REF) SHDN = 0 to 5V step, CLOAD = 50pF, VREF = 0.1% of final value 300 µs Turn-On Settling Time (SHDN to TEMP) SHDN = 0 to 5V step, CLOAD = 50pF, VTEMP = 1°C of final value 500 µs Voltage Reference Output Noise LOGIC INPUT (SHDN) Logic Input High Voltage VIH Logic Input Low Voltage VIL Logic Input Leakage VCC 0.5 V 0.5 ILEAK SHDN = 5V, VCC = 5V 10 25 SHDN = 0V, VCC = 5V 0.1 1 V µA Note 1: All parameters tested at room temperature. Values through temperature are guaranteed by design. Note 2: Guaranteed to 4 sigma. Note 3: Guaranteed by design. Typical Operating Characteristics (VCC = 5V, IOUT = 0V, TA = +25°C, unless otherwise specified.) 1.4 1.2 1.0 0.8 0.6 0.4 0.09 0.08 0.07 0.06 0.05 0 TA = +100°C 160 140 120 TA = +25°C TA = -40°C 100 80 60 40 0.04 0.2 180 SUPPLY CURRENT (mA) 1.6 SUPPLY CURRENT vs. SUPPLY VOLTAGE 200 MAX6610 toc02 TEMPERATURE VOLTAGE (V) 1.8 0.10 REFERENCE VOLTAGE ERROR (%) MAX6610 toc01 2.0 REFERENCE VOLTAGE ERROR vs. TEMPERATURE MAX6610 toc03 MAX6610 TEMPERATURE VOLTAGE vs. TEMPERATURE 20 0 0.03 -40 -25 -10 5 20 35 50 65 80 95 110 125 -40 -25 -10 5 20 35 50 65 80 95 110 125 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 TEMPERATURE (°C) TEMPERATURE (°C) SUPPLY VOLTAGE (V) _______________________________________________________________________________________ 3 MAX6610/MAX6611 ELECTRICAL CHARACTERISTICS (continued) MAX6610/MAX6611 Precision, Low-Power, 6-Pin SOT23 Temperature Sensors and Voltage References Pin Description PIN NAME 1 VCC 2 GND 3 SHDN 4 TEMP 5 6 REF GND FUNCTION Supply Voltage Input. Bypass to GND with a 0.1µF capacitor. Ground Logic Level Shutdown Input (Active Low). Driving SHDN with a logic low turns off internal circuitry to reduce supply current to 1µA (max). Temperature Output Pin. Voltage at TEMP varies linearly with temperature. Reference Voltage Output Must be connected to pin 2. Detailed Description The MAX6610/MAX6611 combine a temperature sensor with a low-power voltage reference. The reference voltage and temperature sensor gain give convenient LSB weights when used with an ADC. For example, when an 8-bit ADC is used with the MAX6610/MAX6611, an LSB is equivalent to 1°C and a 10-bit ADC LSB is equivalent to 0.25°C. The reference output features a proprietary temperature-coefficient, curvature-correction circuit and lasertrimmed thin-film resistors that result in a low temperature coefficient (50ppm/°C max) and initial accuracy of ±0.5% max. The maximum supply current is 250µA during normal operation and 1µA max during shutdown. The supply voltage range is 3.0V to 5.5V for the MAX6610 and 4.5V to 5.5V for the MAX6611. Voltage Reference The MAX6610/MAX6611 REF output provides a voltage reference for ADCs or other system subcircuits. REF is capable of driving loads of up to 1mA. An output capacitor can be as large as 1µF. The voltage reference provides scaled ADC conversions with bit weights that are in convenient units. For the MAX6610 (2.56V REF output), an 8-bit ADC yields 10mV/bit or 2.5mV/bit for a 10-bit ADC. The MAX6611 (4.096V REF output) yields 16mV/bit for an 8bit ADC or 4mV/bit for a 10-bit ADC. 4 Temperature Sensor The MAX6610/MAX6611 TEMP output provides an analog output voltage that is a linear function of its die temperature as defined by: VTEMP = 1.2V + (T°C ✕ 16mV/°C) for the MAX6611 and VTEMP = 0.75V + (T°C ✕ 10mV/°C) for the MAX6610 The slope of the output voltage is V REF /256 per °C (16mV/°C for the MAX6611 and 10mV/°C for the MAX6610). There is a +75°C offset on the temperature output (The MAX6611’s output is 1.2V and, the MAX6610’s output is 0.75V) at 0°C. The temperature error is less than 1.2°C at TA = +25°C, less than ±3.8°C from TA = -20°C to +85°C, and only ±5°C for TA = -40°C to +125°C. Shutdown The MAX6610/MAX6611 are equipped with a shutdown feature that, when driven low, shuts down all internal circuitry and reduces supply current to 1µA (max). When in shutdown, REF is pulled to GND through a 150kΩ resistor and TEMP goes to a high-impedance state. For normal operation, connect SHDN to VCC. Applications Information Output/Load Capacitance The MAX6610/MAX6611 TEMP output can drive capacitive loads up to 0.2µF. The MAX6610/MAX6611 REF output can drive capacitive loads up to 1µF. Devices in this family do not require an output capacitance for dynamic stability. However, in applications where the load or the supply can experience step changes, an output capacitor within the specified range reduces the amount of overshoot (or undershoot) and assists the circuit’s transient response. Many applications do not need an external capacitor, and this family can offer a significant advantage in these applications when board space is critical. Supply Current The quiescent supply current of the MAX6610/ MAX6611 is typically 150µA and is virtually independent of the supply voltage. Unlike shunt-mode references, the load current of series-mode references is drawn from the supply voltage only when required, so supply current is not wasted and efficiency is maximized over the entire supply voltage range. This improved efficiency can help reduce power dissipation and extend battery life. _______________________________________________________________________________________ Precision, Low-Power, 6-Pin SOT23 Temperature Sensors and Voltage References Temperature sensor ICs, like the MAX6610/MAX6611 that sense their own die temperatures, must be mounted on, or close to, the object whose temperature they are intended to measure. Because there is a good thermal path between the package’s metal leads and the IC die, the MAX6610/MAX6611 can accurately measure the temperature of the circuit board to which it is soldered. If the sensor is intended to measure the temperature of a heat-generating component on the circuit board, it should be mounted as close as possible to that component and should share supply and ground traces (if they are not noisy) with that component where possible. This maximizes the heat transfer from the component to the sensor. The thermal path between the plastic package and the die is not as good as the path through the leads, so the MAX6610/MAX6611, like all temperature sensors in plastic packages, are less sensitive to the temperature of the surrounding air than to the temperature of the leads. They can be successfully used to sense ambient temperature if the circuit board is designed to track the ambient temperature. As with any IC, the wiring and circuits must be kept insulated and dry to avoid leakage and corrosion, especially if the part is operated at cold temperatures where condensation can occur. Self-Heating The MAX6610/MAX6611 are low-power circuits and are intended to drive light loads. As a result, the temperature rise due to power dissipation on the die is insignificant under normal conditions. For example, assume that the MAX6611 is operating from a 5V supply at +50°C (VTEMP = 2V) and that the temperature output is driving a 100kΩ load (ITEMP = 20µA). Also assume that the voltage reference is driving a 500µA load and the worst-case quiescent supply current is used. In the 6-pin SOT23 package, the die temperature increases above the ambient by 0.2°C. Next, assume TEMP and REF are driving their maximum loads (ITEMP = 500µA and IREF = 1mA) and VCC = 5V, and TA = +50°C (VTEMP = 2V). Here, the die temperature increases above the ambient by 0.4°C. A first order for self-heating effects can be estimated from temperature and reference load currents and the previous supply voltage. Chip Information TRANSISTOR COUNT: 1346 PROCESS: BiCMOS _______________________________________________________________________________________ 5 MAX6610/MAX6611 Sensing Circuit Board and Ambient Temperatures Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 6LSOT.EPS MAX6610/MAX6611 Precision, Low-Power, 6-Pin SOT23 Temperature Sensors and Voltage References PACKAGE OUTLINE, SOT-23, 6L 21-0058 F 1 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.