Hardware Watchdog Logic Inverter

Document #:

LIGO-D1500215-v1

Document type:

D - Drawings

Abstract:

A small circuit board designed to flip the logic of the binary monitors that read back the state of various parameters in the Hardware Watchdog. The desired condition is that the monitors should report all is well as a logic high, vs. a logic low. To report all is well with a logic low is unsafe in that an unpowered circuit, or disconnected cable could be misinterpreted as a good situation.

Files in Document:

• PDF of Schematic, BOM and Layout (BinaryFlip.pdf, file is not accessible)

Other Files:

• Altium Project Files (Zipped) (BinaryFlip (8-5-2015 10-02-35 AM).zip, file is not accessible)
• Bill of Materials in Excel Format (BinaryFlipBOM.xlsx, file is not accessible)
• Gerber Files for PCB Manufacture (Zipped) (binaryFlip_v1.zip, file is not accessible)
• ODB++ Files (binaryFlipODB.zip, file is not accessible)

ICS/JIRA Record:

• ICS_LINK

Topics:

• System Engineering

Authors:

• Rich Abbott

Keywords:

HWWD watchdog

Referenced by: