摘要：DS1867是一个数字电位器使用EEPROM存储器存储电位器设置，当设备断电。设备的写入过程发生在掉电周期，使该设备“记住”它的最后一个电位器设定在未来的电周期。读写EEPROM的过程，需要一段时间的最低数额，而这往往是长于电源设备在断电在一些应用中。如果是这种情况，需要外部电路提供电源，以保证在掉电周期写入EEPROM正确。给出了一个例子电路，显示此配置。
Maxim>AppNotes>DIGITALPOTENTIOMETERSKeywords:digitpotEpot,EEPOT,digitalpot,DS1867,digitalpots,digitalpotentiometersApr30,2001APPLICATIONNOTE87DS1867PowerSupplyConditioningforEEPROMWiperStorageAbstract:TheDS1867isadigitalpotentiometerthatusesEEPROMmemorytostorepotentiometersettingswhenthedeviceispoweredoff.Thewriteprocesstothedeviceoccursduringthepower-downcyclesothatthedevice"remembers"it'slastpotentiometersettingduringthenextpower-upcycle.TheprocessofwritingEEPROMtakesaminimumamountoftime,whichcanoftenbelongerthanpowerisavailabletothedeviceduringpower-downinsomeapplications.Ifthisisthecase,externalcircuitryisrequiredtosupplypowerduringthepower-downcycleto
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