LM81CIMTX-3 National Semiconductor, LM81CIMTX-3 Datasheet - Page 21

• Manufacturer Part Number: LM81CIMTX-3
• Manufacturer: National Semiconductor

Specifications of LM81CIMTX-3

• Monitored Voltage 1 (typ): 2.5/3.3/5/12V
• Battery Backup Switching: No
• Watchdog Timer: Yes
• Chip Enable Signals: No
• Manual Reset: No
• Package Type: TSSOP
• Operating Supply Voltage (min): 2.8V
• Operating Supply Voltage (max): 3.8V
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Power Fail Detection: No
• Mounting: Surface Mount
• Pin Count: 24
• Lead Free Status / Rohs Status: Not Compliant

Functional Description
Extended Repetitive Interrupt Mode is shown in Figure 14
and operates in the following way: Once activated, all inter-
rupts remain activated until reset by a read of the Interrupt
Status Register 1. Once activated all T_CRIT_A interrupts
remain activated until reset by a read of the Extended Mode
Register 1. Temperature conversion data less than or equal
to T
activated until the temperature data exceeds (T
T
continue to be activated at the end of a conversion until the
temperature data is less than or equal to (T
T_CRIT_A interrupts are activated when the temperature
exceeds T_CRIT. T_CRIT_A interrupts will no longer be
activated if the temperature data at the end of a conversion
is less than or equal to( T_CRIT − T
Extended One-Time Interrupt Mode is shown in Figure 15
and operates in the following way: Once activated all inter-
rupts remain activated until reset by a read of the Interrupt
Status Register 1. Once activated all T_CRIT_A interrupts
remain activated until reset by a read of the Extended Mode
Register 1. An interrupt will be activated when the data of a
temperature conversion is less than or equal to T
rupt cannot again be activated until the data from a tempera-
ture conversion is greater than (T
will be activated when the data of a temperature conversion
is greater than T
until the data of a temperature conversion is less than or
equal to (T
when the data from a temperature conversion is greater than
T_CRIT. Activation of an T_CRIT_A interrupt cannot occur
until the data from a temperature conversion is less than or
equal to ( T_CRIT − T
*
*
Note: Interrupt resets occur only when interrupt Status Register 1 is read.
Note: Interrupt resets occur only when interrupt Status Register 1 is read.
HYST
LOW
FIGURE 14. Extended Repetitive Interrupt Mode
). Exceeding T
FIGURE 15. Extended One-Time Interrupt
will activate interrupt. Interrupt will continue to be
HIGH
− T
HIGH
HYST
HIGH
. Interrupt cannot again be activated
HYST
). T_CRIT_A interrupt is activated
).
activates interrupt. Interrupt will
LOW
HYST
+ T
(Continued)
).
HYST
HIGH
). An interrupt
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LOW
− T
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LOW
. Inter-
HYST
+
).
21
Extended Comparator Mode is shown in Figure 16 and
operates in the following way: Interrupt is activated when the
data from a temperature conversion is less than or equal to
T
conversion exceeds (T
activate interrupt. This interrupt will be reset when data from
a temperature conversion is less than or equal to (T
T
ture exceeds T_CRIT. T_CRIT_A remains active until the
data from a temperature conversion is less than or equal to
(T_CRIT − T
*
Note: Interrupt resets occur only when interrupt Status Register 1 is read.
LOW
HYST
. Interrupt is reset when the data from a temperature
). T_CRIT_A interrupt is activated when the tempera-
FIGURE 16. Extended Comparator Mode
HYST
) resets it.
LOW
+ T
HIGH
). Exceeding T
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HIGH
HIGH
will
−