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 temper-

ature information contained in the duty cycle of the out-

put 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:

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

Process Control

Industrial

HVAC and Environmental Control

Automotive

µP and µC Temperature Monitoring

Features

o Simple Single-Wire PWM Output

o ±1.0°C Accuracy at +25°C

o High Accuracy

o Operate Up to +125°C

o Low 200µA Typical Current Consumption

o Small SOT23 package

High-Accuracy PWM Output Temperature

Sensors

________________________________________________________________

Maxim Integrated Products

1

Pin Configuration

Ordering Information

+3.3V

GND

DOUT

µC

INPUT TO

TIMER/COUNTER

MAX6666

MAX6667

Typical Operating Circuit

19-2138; Rev 3; 8/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX6666AUT+T

-40°C to +125°C

6 SOT23

AATF

MAX6667AUT+T

-40°C to +125°C

6 SOT23

AATG

I.C.

GND

1

+

5

6

I.C.

I.C.

MAX6666

MAX6667

SOT23

2

34

TOP VIEW

+

Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.