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
| Power Supply Voltage | | 2.8V-3.8V |
| Power Supply Current | | 1.5 mA (max) |
| LM88 Temperature Range | | -40°C to +85°C |
| Diode Setpoint Temperature Range | | 0°C to +125°C |
Temperature Trip Point Accuracy:
| Diode Junction Temperature(TDJ) | LM88CIM Accuracy | LM88CIM Temperature Range |
|---|
| +45°C to +85°C | ±3°C (max) | -40°C to +85°C |
| +60°C to +100°C | ±3°C (max) | -40°C to +85°C |
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 |
|
|
