1.特点
1. 符合汽车应用要求
2. 具有符合 AEC-Q100 标准的下列特性：
– 器件温度等级 1：-40°C 至 125°C 环境工作温度
范围
3. 本地和远程二极管传感器精度为 ±1°C
4. 本地和远程通道的分辨率为 0.0625°C
5. 1.7V 至 3.6V 电源和逻辑电压范围
6. 27μA 运行电流，3μA 关断电流
7. 串联电阻抵消
8. 可编程数字滤波器
9. 二极管故障检测
10. 双线和 SMBus™ 串行接口
2.TMP451
| name | namber | type | description |
|---|
| ALERT/ THERM2 | 6 | Digital output | Interrupt or SMBus alert output. Can be configured as a second THERM output. Open-drain; requires pullup resistor to voltage between 1.7 V and 3.6 V. |
| D– | 3 | Analog input | Negative connection to remote temperature sensor. |
| D+ | 2 | Analog input | Positive connection to remote temperature sensor. |
| GND | 5 | Ground | Supply ground connection. |
| SCL | 8 | Digital output | Serial clock line for SMBus. Input; requires pullup resistor to voltage between 1.7 V and 3.6 V if driven by open-drain output. |
| SDA | 7 | Bidirectional digital input-output | Serial data line for SMBus. Open-drain; requires pullup resistor to voltage between 1.7 V and 3.6 V. |
| THERM | 4 | Digital output | Thermal shutdown or fan-control pin. Open-drain; requires pullup resistor to voltage between 1.7 V and3.6 V. |
| V+ | 1 | Power supply | Positive supply voltage, 1.7 V to 3.6 V. |
2-1.使用介绍
TMP451可以分别读取本地温度与远端温度。
TMP451的ALERT/THERM2与THERM管脚在温度正常情况下都为高电平。当达到预设高温，通过ALERT/THERM2管脚电平翻转为低向外界传递高温报警信号，同理，THERM管脚电平为低则达到极高温度上限。
2-2.通信
通信要求如下：
IIC通信的快速模式1K-400KHZ频率，在高速模式1K-2500KHZ频率；
3、寄存器
