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EMC1402-1-ACZL-TR 参数 Datasheet PDF下载

EMC1402-1-ACZL-TR图片预览
型号: EMC1402-1-ACZL-TR
PDF下载: 下载PDF文件 查看货源
内容描述: 1°C温度传感器与beta补偿 [1∑C Temperature Sensor with Beta Compensation]
分类和应用: 传感器换能器温度传感器输出元件
文件页数/大小: 37 页 / 625 K
品牌: SMSC [ SMSC CORPORATION ]
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1°C Temperature Sensor with Beta Compensation  
Datasheet  
Chapter 5 Product Description  
The EMC1402 is an SMBus temperature sensor. The EMC1402 monitors one internal diode and one  
externally connected temperature diode.  
Thermal management is performed in cooperation with a host device. This consists of the host reading  
the temperature data of both the external and internal temperature diodes of the EMC1402 and using  
that data to control the speed of one or more fans.  
The EMC1402 has two levels of monitoring. The first provides a maskable ALERT signal to the host  
when the measured temperatures exceeds user programmable limits. This allows the EMC1402 to be  
used as an independent thermal watchdog to warn the host of temperature hot spots without direct  
control by the host. The second level of monitoring provides a non maskable interrupt on the THERM  
pin if the measured temperatures meet or exceed a second programmable limit.  
Since the EMC1402 automatically corrects for temperature errors due to series resistance in  
temperature diode lines, there is greater flexibility in where external diodes are positioned and better  
measurement accuracy than previously available with non-resistance error correcting devices. The  
automatic beta detection feature means that there is no need to program the device according to which  
type of diode is present. Therefore, the EMC1402 can power up ready to operate for any system  
configuration.  
Figure 5.1 shows a system level block diagram of the EMC1402.  
EMC1402  
CPU  
Host  
DP1  
DN1  
Thermal  
diode  
SMCLK  
Internal  
Diode  
SMDATA  
SMBus  
Interface  
ALERT  
THERM  
Power Control  
Figure 5.1 System Diagram for EMC1402  
5.1  
Modes of Operation  
The EMC1402 has two modes of operation.  
„
Active (Run) - In this mode of operation, the ADC is converting on all temperature channels at the  
programmed conversion rate. The temperature data is updated at the end of every conversion and  
the limits are checked. In Active mode, writing to the one-shot register will do nothing.  
„
Standby (Stop) - In this mode of operation, the majority of circuitry is powered down to reduce  
supply current. The temperature data is not updated and the limits are not checked. In this mode  
of operation, the SMBus is fully active and the part will return requested data. Writing to the one-  
shot register will enable the device to update all temperature channels. Once all the channels are  
updated, the device will return to the Standby mode.  
Revision 1.16 (03-15-07)  
SMSC EMC1402  
DATA1S6HEET