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MAX6576ZUT

Temperature sensor with frequency output

Maxim Integrated 

MAX6576/MAX6577

SOT Temperature Sensors with

Period/Frequency Output

MAX6576

CLOCK WAVEFORM OUTPUT

MAX6577

CLOCK WAVEFORM OUTPUT

tOUT

Figure 1. MAX6576 Timing Diagram

tOUT

fOUT = 1 / tOUT

fOUT (°K)

Figure 2. MAX6577 Timing Diagram

Applications Information

Quick-Look Circuits

Figure 3 shows a quick-look application circuit for the

MAX6576 using a universal counter measuring period.

TS1 and TS0 are both tied to ground to select a scalar

multiplier of 10μs/°K. The MAX6576 converts the ambi-

ent temperature into a square wave with a period that is

10 times the absolute temperature of the device in μs.

At room temperature, the universal counter will display

approximately 2980μs.

Figure 4 shows a quick-look application circuit for the

MAX6577 using a universal counter measuring frequency.

TS1 is tied to ground and TS0 is tied to VDD to select a

scalar multiplier of 1Hz/°K. The MAX6577 converts the

ambient temperature into a square wave with a frequency

that is equal to the absolute temperature of the device

in Hertz. At room temperature, the universal counter will

display approximately 298Hz.

Interfacing with a Microcontroller

Figure 5 shows the MAX6577 interfaced with an 8051 μC.

In this example, TS1 is tied to ground and TS0 is tied to

VDD to select a scalar multiplier of 1Hz/°K. The MAX6577

converts the ambient temperature into a square wave with

a frequency that is equal to the absolute temperature of

the device in Hertz. The 8051 μC reads the frequency of

the square-wave output of the MAX6577 into Timer 0 and

displays the temperature as degrees Celsius in binary on

Port 1. Listing 1 provides the code for this application. The

interface is similar for the MAX6576, except the μC will

perform a period measurement.

Noise Considerations

The accuracy of the MAX6576/MAX6577 is susceptible to

noise generated both internally and externally. The effects

of external noise can be minimized by placing a 0.1μF

ceramic bypass capacitor close to the supply pin of the

devices. Internal noise is inherent in the operation of the

devices and is detailed in Table 3. Internal averaging mini-

mizes the effect of this noise when using longer scalar

timeout multipliers. The effects of this noise are included

in the overall accuracy of the devices as specified in the

Electrical Characteristics.

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