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DS2438解密

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    关于DS2438单片机:
  The DS2438 Smart Battery Monitor provides several functions that are desirable to carry in a battery pack:a means of tagging a battery pack with a unique serial number, a direct-to-digital temperature sensor which eliminates the need for thermistors in the battery pack,an elapsed time meter, and 40 bytes of nonvolatile EEPROM memory for storage of important parameters such as battery chemistry,battery capacity, charging methodology and assembly date. Information is sent to/from the DS2438 over a 1-Wire interface, so that only one wire (and ground) needs to be connected from a central microprocessor to a DS2438. This means that battery packs need only have three output connectors: battery power, ground, and the 1-Wire interface.
  Because each DS2438 contains a unique silicon serial number, multiple DS2438s can exist on the same 1-Wire bus. This allows multiple battery packs to be charged or used in the system simultaneously.Applications for the smart battery monitor include portable computers, portable/cellular telephones, and handheld instrumentation battery packs in which it is critical to monitor real-time battery performance.Used in conjunction with a microcontroller in the host system, the DS2438 provides a complete smart battery pack solution that is fully chemistry-independent.
  DS2438 FEATURES:
  •Unique 1-Wire. interface requires only one port pin for communication
  •Provides unique 64-bit serial number to battery packs
  •Eliminates thermistors by sensing battery temperature on-chip
  •On-board A/D converter allows monitoring of battery voltage for end-of-charge and end-ofdischarge determination
  •On-board integrated current accumulator facilitates fuel gauging
  •Elapsed time meter in binary format
  •40-byte nonvolatile user memory available for storage of battery-specific data
  •Operating range -40oC to +85oC
  •Applications include portable computers, portable/cellular phones, consumer electronics, and handheld instrumentation