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EMC1182-1-AC3-TR 参数 Datasheet PDF下载

EMC1182-1-AC3-TR图片预览
型号: EMC1182-1-AC3-TR
PDF下载: 下载PDF文件 查看货源
内容描述: 双通道1C温度传感器,带有beta补偿和1.8V的SMBus通信 [Dual Channel 1C Temperature Sensor with Beta Compensation and 1.8V SMBus Communications]
分类和应用: 传感器温度传感器通信
文件页数/大小: 48 页 / 565 K
品牌: SMSC [ SMSC CORPORATION ]
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Dual Channel 1°C Temperature Sensor with Beta Compensation and 1.8V SMBus Communications  
Datasheet  
When the THERM pin is asserted, the THERM status bits will likewise be set. Reading these bits will  
not clear them until the THERM pin is deasserted. Once the THERM pin is deasserted, the THERM  
status bits will be automatically cleared.  
5.4.1  
THERM Pin Considerations  
Because of the decode method used to determine the SMBus Address, it is important that the pull-up  
resistance on THERM pin be within ±10% tolerance. Additionally, the pull-up resistor on the THERM  
pin must be connected to the same 3.3V supply that drives the VDD pin.  
For 15ms after power up, the THERM pin must not be pulled low or the SMBus Address will not be  
decoded properly. If the system requirements do not permit these conditions, the THERM pin must be  
isolated from the bus during this time. One method of isolating this pin is shown in Figure 5.2.  
.
+3.3V  
+2.5 - 5V  
VDD  
DP  
1
2
3
8
SMCLK  
SMDATA  
ALERT  
GND  
22  
K
4.7K -  
33  
7
K
EMC1182  
DN  
THERM /  
ADDR  
6
5
Shared THERM  
4
Figure 5.2 Isolating THERM Pin  
5.5  
ALERT / THERM2 Output  
The ALERT / THERM2 pin is an open drain output and requires a pull-up resistor to VDD and has two  
modes of operation: interrupt mode and comparator mode. The mode of the ALERT / THERM2 output  
is selected via the ALERT / COMPALERT/THERM bit in the Configuration Register (see Section 6.4).  
5.5.1  
ALERT / THERM2 Pin InterruptALERT Mode  
When configured to operate in interrupt mode, the ALERT / THERM2 pin asserts low when an out of  
limit measurement (> high limit or < low limit) is detected on any diode or when a diode fault is  
detected, functioning as any standard ALERT in on the SMBus. The ALERT / THERM2 pin will remain  
asserted as long as an out-of-limit condition remains. Once the out-of-limit condition has been  
removed, the ALERT / THERM2 pin will remain asserted until the appropriate status bits are cleared.  
The ALERT/ THERM2 pin can be masked by setting the MASK_ALL bit. Once the ALERT / THERM2  
pin has been masked, it will be de-asserted and remain de-asserted until the MASK_ALL bit is cleared  
by the user. Any interrupt conditions that occur while the ALERT / THERM2 pin is masked will update  
the Status Register normally. There are also individual channel masks (see Section 6.10).  
The ALERT / THERM2 pin is used as an interrupt signal or as an SMBus Alert signal that allows an  
SMBus slave to communicate an error condition to the master. One or more ALERT / THERM2 outputs  
can be hard-wired together.  
5.5.2  
ALERT / THERM2 Pin ComparatorTHERM Mode  
When the ALERT / THERM2 pin is configured to operate in comparator mode, it will be asserted if any  
of the measured temperatures exceeds the respective high limit, acting as a second THERM function  
Revision 1.0 (07-11-13)  
20  
SMSC EMC1182  
DATASHEET