MAX6667ATT+T

MAX6666/MAX6667 High-Accuracy PWM Output Temperature Sensors General Description The MAX6666/MAX6667 are high-accuracy, low-cost, low-power temperature sensors with a single-wire output. The MAX6666/MAX6667 convert the ambient temperature into a ratiometric PWM output with temperature information contained in the duty cycle of the output square wave. The MAX6666 has a push-pull output and the MAX6667 has an open-drain output. The MAX6666/MAX6667 operate at supply voltages from +3V to +5.5V. The typical unloaded supply current at 5.0V is 200µA. Both devices feature a single-wire output that minimizes the number of pins necessary to interface with a microprocessor (µP). The output is a square wave with a nominal frequency of 35Hz (±20%) at +25°C. The output format is decoded as follows: Features ●● Simple Single-Wire PWM Output ●● ±1.0°C Accuracy at +25°C ●● High Accuracy ±1°C at TA = +30°C ±2.5°C at TA = +10°C to +50°C ●● Operate Up to +125°C ●● Low 200µA Typical Current Consumption ●● Small SOT23 package Temperature (°C) = 235 - (400 x t1)/t2 Where t1 is fixed with a typical value of 10ms and t2 is modulated by the temperature (Figure 1). The MAX6666/ MAX6667 operate from -40°C to +125°C and are available in space-saving SOT23 packages. Applications ●● ●● ●● ●● PART Process Control Industrial HVAC and Environmental Control µP and µC Temperature Monitoring TEMP RANGE -40°C to +125°C 6 SOT23 AATF MAX6667AUT+T -40°C to +125°C 6 SOT23 AATG TOP VIEW t1 VCC DOUT t2 MAX6666 MAX6667 µC DOUT INPUT TO TIMER/COUNTER TOP MARK MAX6666AUT+T Pin Configuration +3.3V 1 VCC 2 + MAX6666 MAX6667 GND 3 SOT23 19-2138; Rev 4; 4/14 PINPACKAGE +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. Typical Operating Circuit GND Ordering Information 6 I.C. 5 I.C. 4 I.C. MAX6666/MAX6667 High-Accuracy PWM Output Temperature Sensors Absolute Maximum Ratings (Voltages Referenced to GND) VCC........................................................................-0.3V to +6.0V DOUT MAX6666.............................................. .-0.3V to (VCC + 0.3V) MAX6667..........................................................-0.3V to + 6.0V DOUT Current..................................................... .-1mA to +50mA Continuous Current into Any Other Terminal....................±20mA Continuous Power Dissipation (TA = +70°C) 6-Pin SOT23 (derate 7.4mW/°C above +70°C)...........595mW Operating Temperature Range.......................... -40°C to +150°C Storage Temperature Range............................. -65°C to +150°C Junction Temperature.......................................................+150°C Lead Temperature (soldering, 10s)................................. .+300°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 absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics (VCC = +3.0V to +5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C.) PARAMETER SYMBOL Supply Voltage Range VCC Supply Current ICC CONDITIONS TYP MAX 5.5 V 200 500 µA 3.0 VCC = +3.0V to +5.5V TA = +30°C Temperature Error MIN VCC = +3.3V -1 +1 TA = +10°C to +50°C -2.5 +2.5 TA = 0°C to +100°C -3.8 +3.8 TA = -25°C to +125°C -4.8 +4.8 -6 +6 TA = -40°C, VCC = +3.3V Nominal t1 Pulse Width 10 UNITS °C ms MAX6666 Output High Voltage IOH = 800µA MAX6666 Output Low Voltage IOL = 800µA MAX6666 Fall Time CL = 100pF, RL = ∞ 80 ns MAX6666 Rise Time CL = 100pF, RL = ∞ 80 ns MAX6667 Output Low Voltage 0.4 1.2 MAX6667 Output Capacitance CL = 0 MAX6667 Output Leakage www.maximintegrated.com 0.4 ISINK = 5.0mA CL = 100pF, RL = 10kW PSRR V ISINK = 1.6mA MAX6667 Fall Time Power-Supply Rejection Ratio VCC - 0.4 VCC = +3.0V to +5.5V 40 V V ns 15 pF