ADT7320UCPZ-R2 datasheet(20/24 Pages) AD

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ADT7320

Data Sheet

Rev. 0 | Page 20 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. The ADT7320 must be

fully powered up to VDD before reading INT and CT data.

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 an undertemperature or overtemperature event

depends on the overtemperature 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.

Placing the ADT7320 into shutdown mode does not reset the

INT state in comparator mode.

Interrupt Mode

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

when any ADT7320 register is read. When the INT pin is reset,

it becomes active again only 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.

Placing the ADT7320 into shutdown mode resets the INT pin 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

THIGH

THIGH –THYST

TIME

READ

Figure 19. INT Output Temperature Response for THIGH Overtemperature Events

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