Method and apparatus for connecting devices to a bus

Details Method and apparatus for connecting devices to a bus Method and apparatus for connecting devices to a bus

2005-09-13

2005-09-13

Vo, Tim (Department: 2112)

Electrical computers and digital data processing systems: input/

Intrasystem connection

Bus access regulation

C710S108000, C710S110000, C710S100000

Reexamination Certificate

active

06944695

ABSTRACT:
A two-wire serial (TWS) bus allows bus mastering by any device on the bus utilizing pull-ups. The bus is actively driven low, but typically pulled high by pull-up resistors for each device on the bus. When some of the devices on such a bus have backup power, draining of backup power whenever primary power is lost is avoided by isolating the devices with backup power from the devices without backup power on the TWS bus.

REFERENCES:
patent: 6363437 (2002-03-01), Ptasinski et al.
patent: 6629172 (2003-09-01), Andersson et al.
patent: 6745270 (2004-06-01), Barenys et al.

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