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Temperature Sensors | NCT72
概览
NCT72 是一款双沟道数字式温度计和低温/高温警报器，适用于 PC 和热管理系统。它与 NCT1008 可以实现引脚和寄存器兼容，但 NCT72 支持用户将 /ALERT 引脚拉至 1.8V，不会提高器件的 Idd。NCT72 具有串联电阻抑制功能，可从温度结果中自动消除温度监控二极管高达 1.5 kΩ（典型值）的串联电阻，从而滤除噪声。NCT72 有一个可配置的 /ALERT 输出，以及可切换的宽广温度测量范围。NCT72 的远程热二极管温度测量精度为 ±1°C，环境温度测量精度为 ±3°C。温度测量范围默认为 0°C 至 +127°C，与 NCT1008 兼容，但它可以切换为更宽的测量范围 -64°C 至 +191°C。NCT72 通过 2 线串行接口进行通信，符合系统管理总线 (SMBus/I2C) 标准。NCT72 的默认 SMBus/I2C 地址是 0x4C。NCT72D 的 SMBus/I2C 地址是 0x4D。如同一 SMBus/I2C 上使用了一个以上的 NCT72，地址会非常有用。当片上或远程温度超出范围时，/ALERT 输出会发出信号。/THERM 输出是一个比较器输出，可以控制冷却风扇的开关。如果需要，可以将 /ALERT 输出重新配置为次级 /THERM 输出。
应用
- Thermal Management
终端产品
- Notebook and Desktop Computers
- Game Consoles
- LCD TVs
- Occupancy Sensors
- DSL Line Cards
- Dishwashers
- Refrigerators
- Vacuum Cleaners
- Induction Cookers
- RFID Readers
特性
- On-Chip and Remote Temperature Sensor
- 0.25°C Resolution/1°C Accuracy on Remote Channel
- 1°C Resolution/1°C Accuracy on Local Channel
- Series Resistance Cancellation up to 1.5 kΩ
- Extended, Switchable Temperature Measurement Range 0°C to +127°C (Default) or -64°C to +191°C
- Pin and Register Compatible with NCT1008
- Remote /THERM limit of 108°C
- 2-Wire SMBus/I2C Serial Interface with SMBus Alert Support
- Programmable Over/Undertemperature Limits
- Offset Registers for System Calibration
- Up to Two Overtemperature Fail-Safe /THERM Outputs
- 240 µA Operating Current, 5 µA Standby Current
- Compatible with 1.8 V Logic
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