DS7505 데이터 시트보기 (PDF) - Maxim Integrated

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DS7505

Digital Thermometer and Thermostat

Maxim Integrated 

Digital Thermometer and Thermostat

IN THIS EXAMPLE, THE DS7505 IS CONFIGURED

TO HAVE A FAULT TOLERANCE OF 2.

TOS

TEMPERATURE

THYST

INACTIVE

O.S. OUTPUT—COMPARATOR MODE

ACTIVE

INACTIVE

O.S. OUTPUT—INTERRUPT MODE

ACTIVE

Figure 4. O.S. Output Operation Example

ASSUMES A READ

HAS OCCURED

CONVERSIONS

Interrupt Mode

In interrupt mode, the O.S. output first becomes active

when the measured temperature exceeds the TOS

value a consecutive number of times equal to the FT

value in the configuration register. Once activated, O.S.

can only be cleared by either putting the DS7505 into

shutdown mode or by reading from any register (tem-

perature, configuration, TOS, or THYST) on the device.

Once O.S. has been deactivated, it is only reactivated

when the measured temperature falls below the THYST

value a consecutive number of times equal to the FT

value. Again, O.S can only be cleared by putting the

device into shutdown mode or reading any register.

Thus, this interrupt/clear process is cyclical between

TOS and THYST events (i.e, TOS, clear, THYST, clear,

TOS, clear, THYST, clear, etc.). Thermostat interrupt

mode operation with FT = 2 is illustrated in Figure 4.

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