MAX6577(1999) データシートの表示（PDF） - Maxim Integrated

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MAX6577
(Rev.:1999)

SOT Temperature Sensors with Period/Frequency Output

Maxim Integrated 

SOT Temperature Sensors with

Period/Frequency Output

MAX6576

CLOCK WAVEFORM OUTPUT

MAX6577

CLOCK WAVEFORM OUTPUT

tOUT

tOUT

fOUT = 1 / tOUT

fOUT (°K)

Figure 1. MAX6576 Timing Diagram

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 frequen-

cy. TS1 is tied to ground and TS0 is tied to VDD to

select a scalar multiplier of 1Hz/°K. The MAX6577 con-

verts 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 pro-

vides the code for this application. The interface is simi-

lar 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 opera-

tion of the devices and is detailed in Table 3. Internal

averaging minimizes 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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