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The cheapest way to reprogram a blown efuse is to buy a new efuse. In some cases, the efuse is a separated chip but it can be integrated into the CPU or Microco
by zaarn 5y ago
The cheapest way to reprogram a blown efuse is to buy a new efuse. In some cases, the efuse is a separated chip but it can be integrated into the CPU or Microcontroller, in which case your only option is to find one of those without the efuse blown.
The fuse generally is basically the size of a normal transistor on the IC, good luck getting that repaired otherwise :)
- avian 5y ago> The cheapest way to reprogram a blown efuse is to buy a new efuse. I think this somewhat undersells what a monumental task un-blowing an e-fuse on a chip would be (e.g. resetting something like the USB boot enable bit on the RaspberryPi's SoC). If it's even feasible with today's technology, it would take a top-class semiconductor research facility and significant effort to pull it off. It's $millions compared to taking a new ~$1 chip off the shelf.
- userbinator 5y agoThe fuse generally is basically the size of a normal transistor on the IC, good luck getting that repaired otherwise https://en.wikipedia.org/wiki/Focused_ion_beam https://en.wikipedia.org/wiki/Focused_ion_beam I'm not sure what resolution they've achieved now, but it's definitely possible to either cut or repair connections using such a machine. It's a very expensive process, but definitely within the capabilities of even the far-East "MCU break" companies.