lord loh.
Member
I was wondering how Universal IC testers work. While most ICs have a fixed position for VCC & ground, some ICs have different VCC & ground positions.
If a Vcc & ground are applied to wrong pins, then the IC shall see them as signals without applying Vcc & ground. Will this not damage the IC? How is the set done then?
In case of microcontrollers, some give out their signatures at +12v. While others have absolute maximum ratings of 5.5v. How do these device work then? And what if 3.3 v devices are to be tested with the same device?
And to add to all the trouble, devices have different pin counts.
I actually want to build a universal programmer. And the first step would be to detect the device in the socket.
If a Vcc & ground are applied to wrong pins, then the IC shall see them as signals without applying Vcc & ground. Will this not damage the IC? How is the set done then?
In case of microcontrollers, some give out their signatures at +12v. While others have absolute maximum ratings of 5.5v. How do these device work then? And what if 3.3 v devices are to be tested with the same device?
And to add to all the trouble, devices have different pin counts.
I actually want to build a universal programmer. And the first step would be to detect the device in the socket.