MAX6666 Datasheet | Maxim Integrated

19-2138; Rev 3; 8/09 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: 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. o Simple Single-Wire PWM Output o ±1.0°C Accuracy at +25°C o High Accuracy ±1°C at TA = +30°C ±2.5°C at TA = +10°C to +50°C o Operate Up to +125°C o Low 200µA Typical Current Consumption o Small SOT23 package Features MAX6666/MAX6667 Applications Process Control Industrial HVAC and Environmental Control Automotive µP and µC Temperature Monitoring .. Ordering Information PART MAX6666AUT+T MAX6667AUT+T TEMP RANGE -40°C to +125°C -40°C to +125°C PINPACKAGE 6 SOT23 6 SOT23 TOP MARK AATF AATG +Denotes a lead(Pb)-free/Ro HS-pliant package. T = Tape and reel. Typical Operating Circuit TOP VIEW t1 t2 Pin Configuration +3.3V VCC + DOUT µC INPUT TO TIMER/COUNTER 1 MAX6666 MAX6667 I.C. MAX6666 MAX6667 DOUT GND VCC 2 I.C. GND 3 I.C. SOT23 ________________________________________________________________ Maxim Integrated...