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Contact monitor for body control computers

Posted: 19 Mar 2009     Print Version  Bookmark and Share

Keywords:MAX13362  switch monitor  ECU-level testing 

MAX13362 is a 24-channel automotive switch monitor. The device monitors the status of 24 remote switches in an automobile while withstanding automotive transients and performing well during the many anomalous automotive test conditions, says Maxim. Since the device interfaces to remote switches in the vehicle, it is directly subjected to all the transients observed in the wiring harness of an automobile.

This article documents how the MAX13362 reacts in many circumstances encountered during automotive ECU-level testing. In the test design set up, MAX13362 was connected to two external battery-connected switches and two external ground-connected switches. The MAX15007 linear regulator provided a regulated voltage for the digital portion of the IC and for the local microcontroller. The pins connected to ground-connected switches were bypassed with 47nF capacitors to ground. Inputs connected to battery-connected switches had an additional series resistance of 100W, necessary to limit input current during the harsher transients on the battery line. The microcontroller used to read and write SPI information was a MAXQ2000 running on a 3.3V supply. The switches SGND and SVS served to disconnect the corresponding MAX13362 pins during testing. The voltage sources VSB and VSG allowed the shifting of the battery voltage and ground, respectively.

View the PDF document for more information.

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