Wakeup generator for use with a multi-position resistor ladder s

Details Wakeup generator for use with a multi-position resistor ladder s Wakeup generator for use with a multi-position resistor ladder s

1998-01-12

1999-04-27

Paladini, Albert W.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

3642731, 36452827, 3649488, 39518401, 39575006, G06F 132

Patent

active

058982388

ABSTRACT:
A wakeup generator for generating an interrupt pulse to a microcontroller (10) of an electronics module in response to a switch position change of a multi-position resistance ladder switch (14) to awaken the microcontroller (10) from a low power sleep mode. The wakeup generator uses a low current constant current source (18) and a detector(12). The low current constant current source (18) provides sense current for the switch (14) with a voltage developing across the switch varying according to the switch position selected with each switch position developing a different voltage. The detector detects a change in the voltage across the switch due to a switch position change and generates the interrupt pulse to the microcontroller.

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patent: 5621250 (1997-04-01), Kim
patent: 5633537 (1997-05-01), Kurata et al.
patent: 5665897 (1997-09-01), Lippmann et al.

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