LM88  Product Folder

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.

• 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

Temperature Trip Point Accuracy:

Note: These are sample ranges. Contact factory for other ranges.

• Microprocessor Thermal Management
• Appliances
• Portable Battery Powered Systems
• Fan Control
• Industrial Process Control
• HVAC Systems
• Remote Temperature Sensing
• Electronic System Protection