LM88 National Semiconductor, LM88 Datasheet
LM88
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LM88 Summary of contents
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... 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 ...
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... Simplified Block Diagram and Connection Diagram Order Number Device Marking LM88CIMM-A T08A LM88CIMMX-A LM88CIMM-B T08A LM88CIMMX-B For other setpoints please contact the factory. Performance is dependent on temperature range. Typical Application FIGURE 1. Thermal Protection for Pentium www.national.com NS Package Transport T_SP0 Number Media (˚C) ...
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... A (Note 4) Soldering Information MSOP Package (Note 6) : Vapor Phase (60 seconds) Infrared (15 seconds) Storage Temperature ESD Susceptibility (Note 5) Human Body Model Machine Model LM88 Electrical Characteristics The following specifications apply for 2. all other limits MIN MAX A J Symbol Parameter ...
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... LM88 Electrical Characteristics Note 2: When the input voltage ( any pin exceeds the power supply (V I maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5mA to four. Note 3: Parasitics or ESD protection circuitry are shown in the diagram found below. The ESD Clamp circtuitry is triggered on when there is an ESD event. The table maps what devices appear on the different pins ...
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... When programmed for a less than comparison dition, to T_CRIT parator can be factory programmed to make a greater than or less than comparison. (See Sec- tion 1.3 LM88 OPTIONS) O_SP1 This is an active-low open-drain digital output. It goes LOW when the comparison of the tempera- ture reading of diode one to the value of T_SP1 is true. The SP1 comparator has a built in hyster- esis of 1˚ ...
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... T_CRIT can be any value in the range of 0˚C to +125˚C with a resolution of 1˚C. 1.3.2 Functionality The LM88’s comparators can be factory programmed greater than or less than comparison. When programmed for a greater than comparison, the comparison result is true when the temperature measured is above the prepro- grammed setpoint temperature ...
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... Ideally, the LM88 should be placed within 10cm of the remote diode pins with the traces being as straight, short and identical as possible. Trace resistance of 1 cause as much as 1˚ ...
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... Application Hints 8. The ideal place to connect the LM88’s GND pin is as close as possible to the processor GND associated with the sense diode. 9. Leakage current between D+ and GND should be kept to a minimum. One nano-ampere of leakage can cause 3.0 Applications Circuits FIGURE 5. Pentium processor Thermal Management with Fan Control www.national.com as much as 1˚ ...
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... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. inches (millimeters) 8-Lead Molded Mini Small Outline Package (MSOP) (JEDEC REGISTRATION NUMBER M0-187) Order Number LM88CIMM, or LM88CIMMX NS Package Number MUA08A 2. A critical component is any component of a life support device or system whose failure to perform ...