EVAL-ADT7X20EBZ View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'EVAL-ADT7X20EBZ' PDF : 24 Pages View PDF
Preliminary Technical Data
ADT7420
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 overtemperature mode
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 pin returns to its inactive status
when the temperature drops below the THIGH − THYST limit or
rises above the TLOW + THYST limit.
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 THIGH setpoint register or less than the temperature stored
in the TLOW setpoint register.
Placing the ADT7420 into shutdown mode resets the INT pin
in the interrupt mode.
TEMPERATURE
82°C
81°C
80°C
79°C
78°C
77°C
76°C
75°C
74°C
73°C
THIGH
THIGH – THYST
INT PIN
(COMPARATOR MODE)
POLARITY = ACTIVE LOW
INT PIN
(INTERRUPT MODE)
POLARITY = ACTIVE LOW
INT PIN
(COMPARATOR MODE)
POLARITY = ACTIVE HIGH
INT PIN
(INTERRUPT MODE)
POLARITY = ACTIVE HIGH
TIME
READ
READ
READ
Figure 18. INT Output Temperature Response Diagram for THIGH Overtemperature Events
Rev. PrA | Page 21 of 2
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