Electrical computers and digital data processing systems: input/ – Intrasystem connection – Bus access regulation
Reexamination Certificate
2011-08-30
2011-08-30
Auve, Glenn A (Department: 2111)
Electrical computers and digital data processing systems: input/
Intrasystem connection
Bus access regulation
C710S305000, C710S306000, C713S320000
Reexamination Certificate
active
08010724
ABSTRACT:
I2C/SMBus ladders and ladder enabled ICs (devices) to enable daisy-chained I2C/SMBus communication. The devices are particularly useful in monitoring and/or servicing high-voltage battery stacks and other voltage stacks. The devices are powered from a respective voltage increment in the voltage stack, and include level shifting circuitry so as to be operative with an input voltage up to the breakdown voltage of the level shifting circuitry. Various features are disclosed, including but not limited to a unique data line drive, capacitive coupling between devices in a daisy chain with line clamps for circuitry protection and capacitive coupling charge wiping, and clock stretching to accommodate chain latency.
REFERENCES:
patent: 6981081 (2005-12-01), Stevens et al.
patent: 7380042 (2008-05-01), Wang et al.
patent: 2009/0157929 (2009-06-01), Pigott et al.
“UM10204 I2C-bus specification and user manual”, Rev. 03, NXP Semiconductors, (Jun. 19, 2007), pp. 1-50.
“System Management Bus (SMBus) Specification”, Version 2.0, SBS Implementers Forum, (Aug. 3, 2000), pp. 1-59.
“The I2C-Bus Specification”, Version 2.1, Philips Semiconductors, (Jan. 2000), pp. 1-46.
Hsieh Yi-Chang
Mader Urs H.
Wortham Jason Allen
Auve Glenn A
Blakely , Sokoloff, Taylor & Zafman LLP
Huynh Kim T
Maxim Integrated Products Inc.
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