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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  
5.10 Temperature Monitors  
In general, thermal diode temperature measurements are based on the change in forward bias voltage  
of a diode when operated at two different currents. This ΔVBE is proportional to absolute temperature  
as shown in the following equation:  
where:  
k = Boltzmann’s constant  
η kT  
I HIGH  
Δ V BE  
=
ln  
T = absolute temperature in Kelvin  
q = electron charge  
[1]  
q
I LOW  
η = diode ideality factor  
Figure 5.4 shows a block diagram of the temperature measurement circuit. The negative terminal for  
the remote temperature diode, DN, is internally biased with a forward diode voltage referenced to  
ground.  
IHIGH  
ILOW  
Substrate  
PNP  
DP  
Anti-  
Aliasing  
Filter  
Resistance  
Error  
Correction  
ΔΣ  
ADC  
DN  
Figure 5.4 Block Diagram of Temperature Monitoring Circuit  
5.11 Temperature Measurement Results and Data  
The temperature measurement results are stored in the internal and external temperature registers.  
These are then compared with the values stored in the high and low limit registers. Both external and  
internal temperature measurements are stored in 11-bit format with the eight (8) most significant bits  
stored in a high byte register and the three (3) least significant bits stored in the three (3) MSB  
positions of the low byte register. All other bits of the low byte register are set to zero.  
The EMC1402 has two selectable temperature ranges. The default range is from 0°C to +127°C and  
the temperature is represented as binary number able to report a temperature from 0°C to +127.875°C  
in 0.125°C steps.  
The extended range is an extended temperature range from -64°C to +191°C. The data format is a  
binary number offset by 64°C. The extended range is used to measure temperature diodes with a large  
known offset (such as AMD processor diodes) where the diode temperature plus the offset would be  
equivalent to a temperature higher than +127°C.  
SMSC EMC1402  
Revision 1.16 (03-15-07)  
DATA2S1HEET