Circuits for increasing the reliability of an iontophoretic system
First Claim
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1. A circuit for detecting an impending failure of a battery in an iontophoretic system comprising:
- a microprocessor having an analog-to-digital (A/D) converter for converting an analog input to a digital output, said microprocessor capable of selecting between a voltage reference voltage Vref and a battery voltage Vcc as a reference for the A/D converter, wherein when Vcc is selected as the A/D reference, Vref is read by said A/D converter of said microprocessor as the analog input, the A/D converter outputting a digital count proportional to the ratio (Vref/Vcc), wherein the impending failure of the battery is determined when the digital count is greater than a predetermined threshold.
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Abstract
Circuits are provided for increasing the reliability of an iontophoretic drug delivery system. Such circuits detect the failure of a crystal oscillator of the system, the failure of a voltage reference of the system, or the impending failure of a battery power source of the system.
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Citations
1 Claim
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1. A circuit for detecting an impending failure of a battery in an iontophoretic system comprising:
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a microprocessor having an analog-to-digital (A/D) converter for converting an analog input to a digital output, said microprocessor capable of selecting between a voltage reference voltage Vref and a battery voltage Vcc as a reference for the A/D converter, wherein when Vcc is selected as the A/D reference, Vref is read by said A/D converter of said microprocessor as the analog input, the A/D converter outputting a digital count proportional to the ratio (Vref/Vcc), wherein the impending failure of the battery is determined when the digital count is greater than a predetermined threshold.
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Specification
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Current AssigneeVyteris, Inc.
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Original AssigneeVyteris, Inc.
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InventorsFlower, Ronald J., Garde, Kenneth E., Walter, Steven D.
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Primary Examiner(s)Bockelman, Mark
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Application NumberUS10/127,333Publication NumberTime in Patent Office631 DaysField of Search604/20-21, 604/501, 324/433, 324/426, 607/29US Class Current604/20CPC Class CodesA61N 1/30 Apparatus for iontophoresis...
