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ADT7312

Data Sheet

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INT AND CT OUTPUTS

INT and CT are open-drain outputs. Both outputs require a

10 kΩ pull-up resistor to VDD. The ADT7312 must be fully

powered up to VDD before it can read INT and CT data.

UNDERTEMPERATURE AND OVERTEMPERATURE

DETECTION

The INT and CT pins have two undertemperature/overtemper-

ature modes: comparator mode and interrupt mode. Interrupt

mode is the default power-on mode. The INT output becomes

active when the temperature is greater than the temperature

stored in the THIGH setpoint register or less than the temperature

stored in the TLOW setpoint register. How the INT pin reacts

after an overtemperature or undertemperature event depends

on whether comparator mode or interrupt mode is selected.

Figure 18 illustrates the comparator and interrupt modes for

events exceeding the THIGH limit with both pin polarity settings.

Figure 19 illustrates the comparator and interrupt modes for

events exceeding the TLOW limit with both pin polarity settings.

Comparator Mode

In comparator mode, the INT output returns to its inactive state

when the temperature falls below the THIGH − THYST limit or rises

above the TLOW + THYST limit.

Placing the ADT7312 into shutdown mode does not reset the

INT state in comparator mode.

Interrupt Mode

In interrupt mode, the INT output returns to its inactive state

when any ADT7312 register is read. When INT is reset, it becomes

active again only when the temperature is greater than the temp-

erature stored in the THIGH setpoint register or less than the

temperature stored in the TLOW setpoint register.

Placing the ADT7312 into shutdown mode resets the INT

output in interrupt mode.

TEMPERATURE

82°C

81°C

80°C

79°C

78°C

77°C

76°C

75°C

74°C

73°C

INT PIN

(COMPARATOR MODE)

POLARITY = ACTIVE LOW

INT PIN

(INTERRUPT MODE)

POLARITY = ACTIVE LOW

INT PIN

(INTERRUPT MODE)

POLARITY = ACTIVE HIGH

INT PIN

(COMPARATOR MODE)

POLARITY = ACTIVE HIGH

HIGH

HIGH – THYST

TIME

READ

Figure 18. INT Output Response to THIGH Overtemperature Events

Rev. A

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