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Switching mechanism for battery-backed Real Time Clock

IP.com Disclosure Number: IPCOM000019170D
Original Publication Date: 2003-Sep-03
Included in the Prior Art Database: 2003-Sep-03

Publishing Venue

IBM

Abstract

A common service processor design is required for use across the different server brands. A real time clock is used to time-stamp events, such as errors, that occur in the server. This real time clock function must continue to operate even when there is no power to the card. Different applications require either a high-accuracy, temperature-compensated oscillator or a low-power crystal. Since a single design must be used in both applications, the following switching mechanism properly chooses the correct implementation of either the temperature-compensated oscillator or crystal, and supplies power to the real time clock and to the integrated circuit.