LM81BIMT-3/NOPB
ObsoleteLOCAL TEMP SENSOR, FAN CONTROL, HARDWARE AND 6 POWER SUPPLY VOLTAGE MONITORS
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LM81BIMT-3/NOPB
ObsoleteLOCAL TEMP SENSOR, FAN CONTROL, HARDWARE AND 6 POWER SUPPLY VOLTAGE MONITORS
Technical Specifications
Parameters and characteristics for this part
| Specification | LM81BIMT-3/NOPB |
|---|---|
| Accuracy | 3 °C |
| Function | Hardware Monitor |
| Mounting Type | Surface Mount |
| Operating Temperature [Max] | 125 °C |
| Operating Temperature [Min] | -40 °C |
| Output Alarm | True |
| Output Fan | True |
| Output Type | 2-Wire SMBus |
| Package / Case | 24-TSSOP |
| Package / Case | 0.173 in, 4.4 mm |
| Sensing Temperature [Max] | 125 °C |
| Sensing Temperature [Min] | -40 °C |
| Sensor Type | Internal and External |
| Supplier Device Package | 24-TSSOP |
| Topology | Register Bank, Comparator, ADC (Sigma Delta), Fan Speed Control |
| Voltage - Supply [Max] | 3.8 V |
| Voltage - Supply [Min] | 2.8 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Texas Instruments | TUBE | 1 | $ 4.97 | |
| 100 | $ 4.36 | |||
| 250 | $ 3.06 | |||
| 1000 | $ 2.46 | |||
Description
General part information
LM81 Series
The LM81 is a highly integrated data acquisition system for hardware monitoring of servers, Personal Computers, or virtually any microprocessor-based system. In a PC, the LM81 can be used to monitor power supply voltages, temperatures, and fan speeds. Actual values for these inputs can be read at any time. Programmable WATCHDOG limits in the LM81 activate a fully programmable and maskable interrupt system with two outputs (INTandT_CRIT_). The LM81 has an on-chip digital output temperature sensor with 9-bit or 12-bit resolution, a 6 analog input ADC with 8-bit resolution and an 8-bit DAC. Two fan tachometer outputs can be measured with the LM81’s FAN1 and FAN2 inputs. The DAC, with a 0 to 1.25V output voltage range, can be used for fan speed control. Additional inputs are provided for Chassis Intrusion detection circuits, and VID monitor inputs. The LM81 has a Serial Bus interface that is compatible with SMBus. Serial Bus Timing Diagram
The LM81 is a highly integrated data acquisition system for hardware monitoring of servers, Personal Computers, or virtually any microprocessor-based system. In a PC, the LM81 can be used to monitor power supply voltages, temperatures, and fan speeds. Actual values for these inputs can be read at any time. Programmable WATCHDOG limits in the LM81 activate a fully programmable and maskable interrupt system with two outputs (INTandT_CRIT_). The LM81 has an on-chip digital output temperature sensor with 9-bit or 12-bit resolution, a 6 analog input ADC with 8-bit resolution and an 8-bit DAC. Two fan tachometer outputs can be measured with the LM81’s FAN1 and FAN2 inputs. The DAC, with a 0 to 1.25V output voltage range, can be used for fan speed control. Additional inputs are provided for Chassis Intrusion detection circuits, and VID monitor inputs. The LM81 has a Serial Bus interface that is compatible with SMBus. Serial Bus Timing Diagram
Documents
Technical documentation and resources