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Circuits for increasing the reliability of an iontophoretic system

  • US 6,678,555 B2
  • Filed: 04/22/2002
  • Issued: 01/13/2004
  • Est. Priority Date: 05/20/1999
  • Status: Expired due to Term
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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