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LM88

National Semiconductor
Part Number LM88
Manufacturer National Semiconductor
Description Factory Programmable Dual Remote-Diode Thermostat
Published Apr 25, 2005
Detailed Description LM88 Factory Programmable Dual Remote-Diode Thermostat August 2001 LM88 Factory Programmable Dual Remote-Diode Thermos...
Datasheet PDF File LM88 PDF File

LM88
LM88

Overview
LM88 Factory Programmable Dual Remote-Diode Thermostat August 2001 LM88 Factory Programmable Dual Remote-Diode Thermostat General 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.
Features n 2 external remote diode input channels n 3 digital comparator outputs, 1 per remote diode and one T_CRIT common to both n Factory programmable greater than or less than comparisons n 1˚C comparator hysteresis n 2 setpoints, T_SP0 and T_SP1, factory programmable in 4˚C intervals n 1 setpoint, T_CRIT, factory programmable in 1˚C intervals n Active Low open-drain digital outputs n 8-pin mini-SO plastic package Key Specifications j Power Supply Voltage j Power Supply Current j LM88 Temperature Range j Diode Setpoint Temperature Range j 2.
8V–3.
8V 1.
5 mA (max) −40˚C to +85˚C 0˚C to +125˚C Temperature Trip Point Accuracy: Diode Junction Temperature (TDJ) LM88CIM Accuracy LM88CIM Temperature Range −40˚C to +85˚C −40˚C to +85˚C Applications n n n n n n n n Microprocessor Thermal Management Appliances P...


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