LOW POWER PHYSICAL LAYER FOR A BUS IN AN INDUSTRIAL TRANSMITTER

Title:

LOW POWER PHYSICAL LAYER FOR A BUS IN AN INDUSTRIAL TRANSMITTER

Document Type and Number:

WIPO Patent Application WO2004023423

Kind Code:

A3

Abstract:

A process variable transmitter (200) connects a serial bus (232) to an accessory load. A supply limiter circuit (234) provides a first supply current limit and provides a stored energy output (236). A recessive driver circuit (238) draws a drive current from the stored energy output (236) and couples the drive current to the serial bus (232). The recessive driver circuit (238) provides a drive current limit. A dominant driver circuit (242) has a dominant state in which it conducts the drive current, and an inactive state in which the drive current is available to the accessory load.

Inventors:

TRIMBLE STEVEN R
ORTH KELLY M
NELSON RICHARD L
TYSON DAVID G

Application Number:

PCT/US2003/027561

Publication Date:

August 12, 2004

Filing Date:

September 03, 2003

Export Citation:

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Assignee:

ROSEMOUNT INC (US)

International Classes:

G01L19/08; G01D11/24; G08C19/02; (IPC1-7): G08C19/02

Foreign References:

EP0895209A1	1999-02-03
US20020011115A1	2002-01-31

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