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LM88CIMMX-B Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM88CIMMX-B Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 9 page 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 inter- rupts 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 mea- sured 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 pack- age. Applications n Microprocessor Thermal Management n Appliances n Portable Battery Powered Systems n Fan Control n Industrial Process Control n HVAC Systems n Remote Temperature Sensing n Electronic System Protection 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 2.8V–3.8V j Power Supply Current 1.5 mA (max) j LM88 Temperature Range −40˚C to +85˚C j Diode Setpoint Temperature Range 0˚C to +125˚C j Temperature Trip Point Accuracy: Diode Junction Temperature (T DJ) 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. Simplified Block Diagram and Connection Diagram MSOP-8/MUA08A Package 10132601 Top View 10132602 For simplicity, the effects of the hysteresis are not shown in the temperature response diagram. August 2001 © 2001 National Semiconductor Corporation DS101326 www.national.com |
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