LM81CIMT-3/NOPB National Semiconductor, LM81CIMT-3/NOPB Datasheet - Page 21

• Manufacturer Part Number: LM81CIMT-3/NOPB
• Description: IC MONITOR SYS HARDWAR 24-TSSOP
• Manufacturer: National Semiconductor

Specifications of LM81CIMT-3/NOPB

• Function: Hardware Monitor
• Topology: ADC (Sigma Delta), Comparator, Fan Speed Control, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: No
• Voltage - Supply: 2.8 V ~ 3.8 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Supply Voltage Range: 2.8V To 3.8V
• Reset Type: Active-Low
• Supply Current: 1.4mA
• Digital Ic Case Style: TSSOP
• No. Of Pins: 24
• Operating Temperature Range: -40°C To +125°C
• Rohs Compliant: Yes
• Monitored Voltage: 2.5 V , 3.3 V , 5 V , 12 V
• Manual Reset: Not Resettable
• Watchdog: Watchdog
• Battery Backup Switching: No
• Supply Voltage (max): 3.8 V
• Supply Voltage (min): 2.8 V
• Supply Current (typ): 400 uA (Typ)
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LM81CIMT-3; *LM81CIMT-3/NOPB; LM81CIMT-3

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
−