ADT7420 Analog Devices, ADT7420 Datasheet - Page 21

• Manufacturer Part Number: ADT7420
• Description: 16-Bit Digital I2C Temperature Sensor
• Manufacturer: Analog Devices

Preliminary Technical Data
INT AND CT OUTPUTS
The INT and CT pins are open-drain outputs, and both pins
require a 10 kΩ pull-up resistor to V
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 T
the temperature stored in the T
reacts after this event depends on the overtemperature mode
selected.
Figure 18 illustrates the comparator and interrupt modes for
events exceeding the T
Figure 19 illustrates the comparator and interrupt modes for
events exceeding the T
HIGH
LOW
limit with both pin polarity settings.
limit with both pin polarity settings.
HIGH
LOW
POLARITY = ACTIVE HIGH
POLARITY = ACTIVE HIGH
POLARITY = ACTIVE LOW
POLARITY = ACTIVE LOW
Figure 18. INT Output Temperature Response Diagram for T
(COMPARATOR MODE)
(COMPARATOR MODE)
setpoint register. How this pin
setpoint register or less than
(INTERRUPT MODE)
(INTERRUPT MODE)
DD
.
INT PIN
INT PIN
INT PIN
INT PIN
TEMPERATURE
82°C
81°C
80°C
79°C
78°C
77°C
76°C
75°C
74°C
73°C
Rev. PrA | Page 21 of 2
READ
Comparator Mode
In comparator mode, the INT pin returns to its inactive status
when the temperature drops below the T
rises above the T
Putting the ADT7420 into shutdown mode does not reset the
INT state in comparator mode.
Interrupt Mode
In interrupt mode, the INT pin goes inactive when any ADT7420
register is read. Once the INT pin is reset, it goes active again
only when the temperature is greater than the temperature stored
in the T
in the T
Placing the ADT7420 into shutdown mode resets the INT pin
in the interrupt mode.
READ
HIGH
LOW
HIGH
Overtemperature Events
setpoint register.
setpoint register or less than the temperature stored
LOW
READ
+ T
T
T
HIGH
HIGH
TIME
HYST
– T
HYST
limit.
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HIGH
− T
HYST
ADT7420
limit or