LM77
- Window Comparison Simplifies Design of ACPI Compatible Temperature Monitoring and Control.
- Serial Bus Interface
- Separate Open-Drain Outputs for Interrupt and Critical Temperature Shutdown
- Shutdown Mode to Minimize Power Consumption
- Up to 4 LM77s Can be Connected to a Single Bus
- 9-bit + Sign Output; Full-Scale Reading of Over 128°C
- SOIC and VSSOP 8-lead Packages
Key Specifications
- Supply Voltage 3.0V to 5.5V
- Supply Current
- Operating250 μA (typ)500 μA (max)
- Shutdown5 μA (typ)
- Temperature Accuracy
- −10°C to 65°C, ±1.5°C(max)
- −25°C to 100°C, ±2°C(max)
- −55°C to 125°C, ±3°C(max)
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The LM77 is a digital temperature sensor and thermal window comparator with an I2C Serial Bus interface. The window-comparator architecture of the LM77 eases the design of temperature control systems conforming to the ACPI (Advanced Configuration and Power Interface) specification for personal computers. The open-drain Interrupt (INT) output becomes active whenever temperature goes outside a programmable window, while a separate Critical Temperature Alarm (T_CRIT_A) output becomes active when the temperature exceeds a programmable critical limit. The INT output can operate in either a comparator or event mode, while the T_CRIT_A output operates in comparator mode only.
The host can program both the upper and lower limits of the window as well as the critical temperature limit. Programmable hysterisis as well as a fault queue are available to minimize false tripping. Two pins (A0, A1) are available for address selection. The sensor powers up with default thresholds of 2°C THYST, 10°C TLOW, 64°C THIGH, and 80°C T_CRIT.
The LM77's 3.0V to 5.5V supply voltage range, Serial Bus interface, 9-bit + sign output, and full-scale range of over 128°C make it ideal for a wide range of applications. These include thermal management and protection applications in personal computers, electronic test equipment, office electronics, automotive, and HVAC applications.
技術文件
類型 | 標題 | 日期 | ||
---|---|---|---|---|
* | Data sheet | 9Bit + Dig Temp Sens & Thermal Window Comparator w/Two-Wire Interface datasheet (Rev. F) | 2013年 3月 22日 | |
Application note | Applying I2C-Compatible Temperature Sensors in Systems With Slow Clock Edges (Rev. A) | 2013年 5月 6日 |
設計與開發
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LM77SW-LINUX — 適用於 LM77 的 Linux 驅動程式
Linux Mainline Status
Available in Linux Main line: Yes
Available through git.ti.com: N/A
- lm77
The (...)
封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
---|---|---|
SOIC (D) | 8 | Ultra Librarian |
VSSOP (DGK) | 8 | Ultra Librarian |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點