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.
기술 자료
| 상위 문서 | 유형 | 직함 | 형식 옵션 | 최신 영어 버전 다운로드 | 날짜 | |
|---|---|---|---|---|---|---|
| * | 데이터 시트 | LM87 Serial Interface Sys Hardware Monitor w/Remote Diode Temp Sensing datasheet (Rev. J) | 2013. 3. 22 | |||
| 애플리케이션 노트 | Applying I2C-Compatible Temperature Sensors in Systems With Slow Clock Edges (Rev. A) | 2013. 5. 6 | ||||
| 백서 | Cost Effective Partitioning of IO & Mgm Func in PCs - Intro of SensorPath Tech | 2004. 1. 1 |
설계 및 개발
추가 조건 또는 필수 리소스는 사용 가능한 경우 아래 제목을 클릭하여 세부 정보 페이지를 확인하세요.
LM87SW-LINUX — LM87용 Linux 드라이버
The Linux driver supports the LM87 System Hardware Monitor. The Linux driver supports communication through the I2C bus and interfaces with the Hardware Monitoring sub-system.
Linux Mainline StatusAvailable in Linux Main line: Yes
Available through git.ti.com: N/A
- lm87
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| TSSOP (PW) | 24 | Ultra Librarian |
주문 및 품질
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