LM87
- Remote diode temperature sensing (2 channels)
- 8 positive voltage inputs with scaling resistors for monitoring +5 V, +12 V, +3.3 V, +2.5 V, Vccp power supplies directly
- 2 inputs selectable for fan speed or voltage monitoring
- 8-bit DAC output for controlling fan speed
- Chassis Intrusion Detector input
- WATCHDOG comparison of all monitored values
- SMBus or I2C Serial Bus interface compatibility
- VID0-VID4 or IRQ0-IRQ4 monitoring inputs
- On chip temperature sensor
Key Specifications
- Voltage Monitoring Error ±2 % (max)
- External Temperature Error ±4 °C (max)
- Internal Temperature Error
- −40 °C to +125 °C ± 3 °C (typ)
- Supply Voltage Range 2.8 to 3.8 V
- Supply Current 0.7 mA (typ)
- ADC and DAC Resolution 8 Bits
- Temperature Resolution 1.0 °C
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The LM87 is a highly integrated data acquisition system for hardware monitoring of servers, Personal Computers, or virtually any microprocessor-based system. In a PC, the LM87 can be used to monitor power supply voltages, motherboard and processor temperatures, and fan speeds. Actual values for these inputs can be read at any time. Programmable WATCHDOG limits in the LM87 activate a fully programmable and maskable interrupt system with two outputs (INT# and THERM#).
The LM87 has an on-chip digital output temperature sensor with 8-bit resolution as well as the capability of monitoring 2 external diode temperatures to 8-bit resolution, an 8 channel analog input ADC with 8-bit resolution and an 8-bit DAC. A channel on the ADC measures the supply voltage applied to the LM87, nominally 3.3 V. Two of the ADC inputs can be redirected to a counter that can measure the speed of up to 2 fans. A slow speed ΣΔ ADC architecture allows stable measurement of signals in an extremely noisy environment. The DAC, with a 0 to 2.5 V output voltage range, can be used for fan speed control. Additional inputs are provided for Chassis Intrusion detection circuits, and VID monitor inputs. The VID monitor inputs can also be used as IRQ inputs if VID monitoring is not required. The LM87 has a Serial Bus interface that is compatible with SMBus and I2C.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | LM87 Serial Interface Sys Hardware Monitor w/Remote Diode Temp Sensing datasheet (Rev. J) | 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 | ||
| White paper | Cost Effective Partitioning of IO & Mgm Func in PCs - Intro of SensorPath Tech | 2004年 1月 1日 |
設計與開發
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LM87SW-LINUX — 適用於 LM87 的 Linux 驅動程式
Linux Mainline Status
Available in Linux Main line: Yes
Available through git.ti.com: N/A
- lm87
| 封裝 | 引腳 | 下載 |
|---|---|---|
| TSSOP (PW) | 24 | 檢視選項 |
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
- 資格摘要
- 進行中可靠性監測
- 晶圓廠位置
- 組裝地點