MAX6677

The MAX6676/MAX6677 are high-accuracy, low-power temperature sensors with a single-wire output. The MAX6676/MAX6677 convert the ambient temperature into a ratiometric PWM output with temperature information contained in the duty cycle of the output square wave. The MAX6676 has an open-drain output and the MAX6677 has a push-pull output.

The MAX6676/MAX6677 are specified for operation with power-supply voltages from 1.8V to 3.6V, or from 3.6V to 5.5V (MAX6676 only). The typical unloaded supply current is 80µA. All 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 1.8kHz (±20%) at +25°C. The output format is decoded as follows:

Temperature (°C) = 398.15 x (t₁ / t₂) - 273.15

Where t₁ is fixed with a typical value of 0.24ms and t₂ is modulated by the temperature. The MAX6676/ MAX6677 operate from -40°C to +125°C and are available in space-saving 6-pin SOT23 packages.

Applications

• HVAC and Environmental Control
• Industrial
• Isolated Temperature Sensing
• Portable Devices
• Process Control
• µP and µC Temperature Monitoring