I’ve been quite busy with things over the weekend that I’ve not had much time for any blogging, perhaps with minor updates to the recent Optus outage posting . The technical details behind how things work are often overlooked in reporting. Nevertheless, I’ve also been working on a couple of RoadTest reviews and a design challenge in parallel.
Temperature monitoring for overtemperature protection can be achieved in many ways, with thermistors being a very simple, reliable and cost-effective solution. However, the use of thermistors requires some analog circuitry, especially when interfacing to the digital domain. This circuitry can be somewhat finnicky to get right and is sensitive to component variations, thus requires redesign when voltages or thermistors are changed. It also takes up a bit of board area and can consume more current than absolu
Toshiba’s Thermoflagger is a way around this problem, comprising of a monolithic IC that tries to solve all of these pains. It comprises of a current-source, comparator, voltage reference and output-logic in a single SOT-553 package.
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