National Semiconductor 65nm process LSI dedicated temperature sensor IC

National Semiconductor Corporation Ns (National Semiconductor Corp.) for the design criteria for the LSI 65nm released a micro temperature sensor IC "LM95234" and other 5 kinds of products. These products are equipped with a temperature measurement on the chip TruTherm (Thermal Diode) error correction function". The company's first 65nm technology products to a microprocessor without using the TruTherm function of the case, the temperature measurement, in the 90nm process is only 1 DEG C on chip thermal diode error to 65nm process was increased to 3 degrees celsius. This error can be controlled at 0.5 DEG C by TruTehrm function. This product can support 65nm and 90nm two kinds of process diode.

The improved digital filter will improve the detection accuracy than the previous maximum of about 4 times. Generally speaking, the working frequency of the more and more micro processor is higher, the temperature of the chip is violent. The temperature sensor IC measures the temperature by applying a 2 current to the on-chip temperature sensor element. There is a problem to be solved in the high frequency of LSI, that is, because of the change of the temperature between the 2 measurements, the short time temperature change in fact is not detected. This product will be regarded as the error of this pulse temperature changes, and the average value.

LM95234 is for notebook computers and server products, in addition to the temperature sensor IC own temperature, but also can be used to determine the temperature of other parts of the 4 diodes. It is intended to be used for the determination of the temperature of a chip on a chip, such as a microprocessor and image processing LSI, and a diode element in a memory and hard disk. Of the 4 channels that measure the diode temperature, there are 2 equipped with a digital filter. The rest of the 2 channels with the "Fault-Queue" function, in the event of sharp temperature change, if the 3 times more than the trigger value will be identified as the temperature change. The measurement errors of the 4 channels are + 0.75. At present, the sample has been supplied, the plan from September 2006 to October mass production.

At the same time, the LM94 is a kind of temperature sensor IC in the fan control function, such as the hardware monitor, suitable for 2 dual core microprocessor server. The temperature can be measured on 4 on-chip thermal diodes and 2 analog temperature sensors IC. Equipped with the Intel Proportional Integral (PI) control function. PI control can effectively prevent the occurrence of a short time temperature change, the additional control of the fan and the resulting beep sound, etc., had to be able to have this function by other microcontrollers. Mass production has now begun. The unit price is $6.2 per 1000 bulk purchases.