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Data Sheet

ADT7410

Rev. C | Page 21 of 24

INT AND CT OUTPUTS

The INT and CT pins are open-drain outputs, and both pins

require a 10 kΩ pull-up resistor to VDD.

UNDERTEMPERATURE AND OVERTEMPERATURE

DETECTION

The INT and CT pins have two undertemperature/

overtemperature modes: comparator mode and interrupt mode.

The interrupt mode is the default power-up overtemperature

mode. The INT output pin 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 this pin reacts after this event depends on the overtemper-

ature mode selected.

Figure 19 illustrates the comparator and interrupt modes for

events exceeding the THIGH limit with both pin polarity settings.

Figure 20 illustrates the comparator and interrupt modes for

events exceeding the TLOW limit with both pin polarity settings.

Comparator Mode

In comparator mode, the INT pin returns to its inactive status

when the temperature drops below the THIGH − THYST limit or

rises above the TLOW + THYST limit.

Putting the ADT7410 into shutdown mode does not reset the

INT state in comparator mode.

Interrupt Mode

In interrupt mode, the INT pin only goes inactive when the

ADT7410 register is read, that is, independently, when the

temperature has recovered and gotten back to within the limits

before Point C, as shown in Figure 20. when the INT pin is

reset, it only goes active again when the temperature goes from

an overtemperature/undertemperature condition back to

a temperature within the limits or vice versa.

As shown in Figure 19, the INT pin goes active when the

temperature rises beyond the THIGH limit and resets the next

time any register is read. When reset, it does not go active again

until temperatures decrease back to below THIGH − THYST (Point A),

and when reset, it goes active again when the THIGH/TLOW is

exceeded (Point B).

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 19. INT Output Temperature Response Diagram for THIGH Overtemperature Events

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