DS1670便携式系统控制器-DS1670 Portable

文章摘要：Analog-to-Digital ConverterThe DS1670 also has a 3-channel 8-bit analog-to-digital converter. In our typical application example, one input of the ADC is used as a battery "gas gauge." This input samples the voltage on the primary power supply battery, which is first reduced through a volt

DS1670便携式系统控制器-DS1670 Portable,标签：计算机控制技术,工厂电气控制技术,http://www.88dzw.com
Analog-to-Digital ConverterThe DS1670 also has a 3-channel 8-bit analog-to-digital converter. In our typical application example, one input of the ADC is used as a battery "gas gauge." This input samples the voltage on the primary power supply battery, which is first reduced through a voltage divider circuit. The microprocessor monitors this voltage and generates a low battery warning if the voltage falls below a specified threshold, thus signaling the end user that the battery needs to be changed. The additional ADC inputs could be interfaced with environmental sensors or other analog signals.

Low Power

The functional features of the DS1670 are certainly a great benefit to many system designers, but equally important in portable systems is low power to ensure long battery life. It is probable that the majority of the time the DS1670 will sit idle in a powered-up system. In this type of standby operation, the DS1670 will consume a maximum of 100µA (200µA maximum if the analog-to-digital converter is enabled). During active operation, when the 3-wire interface is being driven, the DS1670 will typically consume 5mA (10mA maximum). The lowest power mode of the device is when the primary power supply is removed and the device is being powered by VBAT. In this mode, the device typically consumes 300nA (500nA maximum).

Summary

Overall, it has been shown that the DS1670 Portable System Controller provides many of the functions necessary in battery backed portable products. The integration of these features onto a single piece of silicon replaces as many as four separate integrated circuits and is available in an extremely small 20-pin TSSOP package. The DS1670 is also ideally suited for battery backed products because of its low power consumption, particularly when the device is in standby or battery backed mode.

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