パッケージ情報
| パッケージ | ピン数 VSSOP (DGK) | 8 |
| 動作温度範囲 (℃) 0 to 125 |
| パッケージ数量 | キャリア 3,500 | LARGE T&R |
LM89 の特徴
- Accurately senses die temperature of remote ICs or diode junctions
- Offset register allows sensing a variety of thermal diodes accurately
- On-board local temperature sensing
- 10 bit plus sign remote diode temperature data format, 0.125 °C resolution
- T_CRIT_A# output useful for system shutdown
- ALERT# output supports SMBus 2.0 protocol
- SMBus 2.0 compatible interface, supports TIMEOUT
- 8-pin MSOP and SOIC packages
Key Specifications
| Supply Voltage | 3.0 V to 3.6 V |
| Supply Current | 0.8 mA (typ) |
| Local Temp Accuracy (includes quantization error) | |
| TA=25°C to 125°C | ±3.0 °C (max) |
| Remote Diode Temp Accuracy (includes quantization error) | |
| TA=30°C,TD=80°C | ±0.75 °C (max) |
| TA=30°C to 50°C, TD=60°C to 100°C | ±1.0 °C (max) |
| TA=0°C to 85°C, TD=25°C to 125°C | ±3.0 °C (max) |
LM89 に関する概要
The LM89 is an 11-bit digital temperature sensor with a 2-wire System Management Bus (SMBus) serial interface. The LM89 accurately measures its own temperature as well as the temperature of an external device, such as processor thermal diode or diode-connected transistor such as the 2N3904. The temperature of any ASIC can be accurately determined using the LM89 as long as a dedicated diode (semiconductor junction) is available on the target die. The LM89 remote sensor accuracy of ±0.75°C is factory trimmed for the series resistance and 1.0021 typical non-ideality factor of the Intel® Pentium™ 4 and the Mobile Pentium™ 4 Processor-M thermal diode. The LM89 has an Offset register to allow measuring other diodes without requiring continuous software management. Contact hardware.monitor.team@nsc.com to obtain the latest data for new processors.
The LM89 and the LM89-1 have the same functions but different SMBus slave addresses. This allows for one of each to be on the bus at the same time.
Activation of the ALERT# output occurs when any temperature goes outside a preprogrammed window set by the HIGH and LOW temperature limit registers or exceeds the T_CRIT temperature limit. Activation of the T_CRIT_A# occurs when any temperature exceeds the T_CRIT programmed limit. The LM89 is pin and register compatible with the LM86, LM90, Analog Devices ADM1032 and Maxim MAX6657/8.