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Features
2 external remote diode input channels
3 digital comparator outputs, 1 per remote diode and one T_CRIT common to both
Factory programmable greater than or less than comparisons
1°C comparator hysteresis
2 setpoints, T_SP0 and T_SP1, factory programmable in 4°C intervals
1 setpoint, T_CRIT, factory programmable in 1°C intervals
Active Low open-drain digital outputs
8-pin mini-SO plastic package
Description The LM88 is a dual remote-diode temperature sensor with 3 digital comparators. The LM88 has 3 open-drain outputs (
^O_SP0,
^O_SP1 and
^O_CRIT) that can be used as interrupts or to signal system shutdown. The digital comparators can be factory programmed to make a
greater than or less than comparison. When programmed for a greater than comparison outputs:
^O_SP0 and
^O_SP1 activate when the temperatures measured by D0 or D1 exceed the associated setpoints of T_SP0 or T_SP1.
^O_CRIT activates when the temperature measured by either D0 or D1 exceeds setpoint T_CRIT.
T_CRIT can be set at 1°C intervals from −40°C to +125°C. T_SP0 and T_SP1 can be set at 4°C intervals in the range of T_CRIT
+127°C/−128°C. Hysteresis for all comparators is set to 1°C.
^O_CRIT, in conjunction with T_CRIT, could be used to prevent catastrophic damage to key subsystems such as notebook Card Bus cards
while
^O_SP0 and
^O_SP1, in conjunction with T_SP0 and T_SP1, can warn of an impending failure.
The LM88 is available in an 8-lead mini-small-outline package.
Key Specification
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Power Supply Voltage
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2.8V–3.8V
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Power Supply Current
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1.5 mA (max)
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LM88 Temperature Range
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−40°C to +85°C
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Diode Setpoint Temperature Range
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0°C to +125°C
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■ Temperature Trip Point Accuracy:
| Diode Junction Temperature
(TDJ)
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LM88CIM Accuracy
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LM88CIM Temperature Range
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| +45°C to +85°C
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±3°C (max)
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−40°C to +85°C
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| +60°C to +100°C
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±3°C (max)
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−40°C to +85°C
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Note: These are sample ranges. Contact factory for other ranges.
Applications
Microprocessor Thermal Management
Appliances
Portable Battery Powered Systems
Fan Control
Industrial Process Control
HVAC Systems
Remote Temperature Sensing
Electronic System Protection
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