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Low Power Battery Status Indication Disclosure Number: IPCOM000022141D
Publication Date: 2004-Feb-26
Document File: 1 page(s) / 55K

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Low Power Battery Status Indication

Reducing the standby power of battery operated circuits, for example in a battery operated shaver, is a major issue in connection with battery life time. An empty battery often results in a complete shutdown of the circuitry or a power save mode without any visible status indication to the customer, unless very low power displays (i.e. LCDs) are used to indicate the battery status. For low-cost applications, however, there is a need for cheap and simple LED-indications, and still a long battery life.

For indicating the battery status when in power save mode, normally the controller needs to resume normal operation every now and then in order to be able to start or stop indications if needed. To avoid this an autonomous LED flasher is proposed.

The autonomous LED flasher makes possible to keep the controller in a power save mode where the selected indication (semi-autonomous) continues in a way that has no major contribution to power loss in standby or power save mode.

The battery status can be switched on by switching a port on the controller to high level, and switched off by switching the port on the controller to low level, and when the controller switches the port to Input/High-Z, the signaling is autonomous and flashing.

Embodiment of the autonomous LED-flasher:

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