On-chip detection circuit off-chip mechanical switch's open...

Details On-chip detection circuit off-chip mechanical switch's open... On-chip detection circuit off-chip mechanical switch's open...

2008-07-29

2008-07-29

Eng, George (Department: 2617)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S090100, C455S090200, C455S351000, C327S103000, C327S334000

Reexamination Certificate

active

07406339

ABSTRACT:
An on-chip detection circuit automatically detects when an external switch has been activated. When the device is initialized, the detection circuit measures the operating current and coverts the information into an analog voltage. The analog voltage is then processed through an on-chip analog-to-digital converter and the digitized result is stored as a reference value. To sense the open and close action of the off-chip mechanical switch, the device then takes a sample of the operating current periodically, digitizes this information and compares the sampled value to the reference value. A change in value larger than some predetermined level indicates the external switch has been activated.

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