ATS75D8 ETC2 [List of Unclassifed Manufacturers], ATS75D8 Datasheet - Page 5

• Manufacturer Part Number: ATS75D8
• Description: LOW- OLTAGE 2-WIRE DIGITAL TEMPERATURE SENSOR With Thermal Alarm
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

Comparator Mode
In Comparator Mode, each time an temperature-to-
digital(T-to-D) temperature conversion occurs, the new
digital temperature is compared to the value stored in the
T
consecutive temperature measurements are greater than
the value stored in the T
activated. For example, if bits F1 and F0 are equal to “10”
(fault tolerance = 4), four consecutive temperature
measurements must exceed T
output. Once the O.S output is active, it will remain active
until the first time the measured temperature drops below
the temperature stored in the T
operation of the alarm in Comparator Mode with fault
tolerance=2 is illustrated in Figure 1.
© Andigilog, Inc. 2005
OS
and T
HYST
O.S. (Comparator Mode)
Temperature-to-Digital
O.S. (Interrupt Mode)
Registers. If a fault tolerance number of
Figure 1. Thermal Alarm Operation in Comparator and Interrupt Modes
Conversion
OS
Register, the O.S. output will be
T
T
HYST
OS
OS
For this example:
Fault Tolerance = 2
Output Polarity = Active Low
HYST
to activate the O.S.
Register.
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The
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Interrupt Mode
In Interrupt Mode the O.S. output will first become active
after a fault tolerance number of consecutive temperature
measurements exceed the value stored in the T
(similar to Comparator Mode). Once O.S. is active, it can
only be cleared by a user read from any of the aTS75
registers (Temperature, Configuration, T
putting the aTS75 into Shutdown Mode (i.e., by setting the
shutdown bit in the Configuration Register to “1”).
cleared, the O.S. output can only be activated again by a
fault
measurements that are lower than the value stored in
T
be deactivated by a user read or shutdown.
Interrupt Mode the activate/clear cycle for O.S. has the
following
temperature < T
The operation of the alarm in Interrupt Mode with fault
tolerance=2 is also illustrated in Figure 1.
Read (or Shutdown)
HYST
. Again, once it is activated the O.S. output can only
tolerance
pattern:
HYST
number
, clear, temperature > T
temperature
of
consecutive
April 2006 - 70A03204
OS
>
, or T
OS
aTS75
T
temperature
OS
, clear, etc.
OS
HYST
,
Thus, in
Register
) or by
Once
clear,