Quecoo T12-958 soldering station - INVER error?

[stj]

if it's STlink 2.0 or 2.1 you dont need programming software,
the stlink will show up like a usb flashdrive and you just copy the BIN or HEX file into it.
thats it - it will program the chip for you.

[redwire]

Hi all

My board hasn't actually got a version number printed on it at all, but software reports HW revision 3.2. I've fixed the BOOT0 and RTC issues in my schematic (I had BOOT0 connected like that as the traces are physically connected to it, but as someone said on EEVBlog it just seems to be grounded out anyway).


R6 is definitely 5 milliohm, has R005 printed on it. I have rechecked and am also convinced the other resistors are correct in that part of the schematic. I've added a missing 4K7 to ground on V+ but I don't think that makes a difference as it's not on +in or -in?

With that V03 schematic, the "ADC" section U7 trips above 26A if it's R6 0.005Ω sense-resistor on heater return. I calc 0.130V at the op-amp with 2.5V/20k/3k.
It could only be for a fast circuit breaker with a shorted cartridge? You're not getting 26A out for long, just a blip.
Hot-cartridge swaps can short at the handle/socket connector and blow a power mosfet, maybe Quicko is trying to cover for that.

The Temp sense sch is still wrong - op-amp is in non-inverting config, so the wires to R10 are flipped. It should be op-amp output to R10 with R23 to GND and the junction of R10/R23 only goes to (+) pin 3. op-amp out also goes to R18.
op-amp (-) input pin 1 is the one that goes to heater signal. So you have pin 1, 3 flipped as well.
Ferrite bead FB1 is in the wrong spot or it is more likely a NTC thermistor for cold-junction temp.

[macklij]

if it's STlink 2.0 or 2.1 you dont need programming software,
the stlink will show up like a usb flashdrive and you just copy the BIN or HEX file into it.
thats it - it will program the chip for you.

Thanks - I haven't played with the STLink yet

[spleenharvester]

Cheers redwire. Think I have fixed it all, attached V04 schematic. I've checked and rechecked the ADC section many times and can't find any errors, maybe someone else with this board can confirm.

As an aside, I've received my replacement T12-958v2. Interestingly although this one still shows as software V3.2S and has identical PSU and controller boards it does not suffer the INVERT error.

[redwire]

There must be a hardware change/mod to fix the INVER problem. If you can post a pic so we can go over it- I know the thermocouple op-amps some are crap quality, and that heater current thing seemed to trip way too high so the resistors I would guess got changed.

The schematic looks pretty good now