Serial communication interface system having programmable microcontroller for use in a battery pack
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United States of America Patent
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Nov 24, 1998
Grant Date -
N/A
app pub date -
Oct 13, 1995
filing date -
Oct 13, 1995
priority date (Note) -
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Abstract
A microcontroller for use in battery charging and monitoring applications is disclosed. The microcontroller includes a microprocessor and various front-end analog circuitry such as a slope A/D converter and a multiplexer for allowing a plurality of analog input signals to be converted to corresponding digital counts indicative of signal level. The microcontroller also includes an I.sup.2 C interface for supporting a bi-directional two wire bus and data transmission protocol that is useful for serially communicating with other peripheral or microcontroller devices. By making use of the I.sup.2 C interface, the microcontroller can be programmed while in the end application circuit. Such a feature allows customers to manufacture boards with unprogrammed devices and then program the microcontroller just before shipping the product. This allows the most recent firmware or a custom firmware to be programmed.
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