I have one chip connected with address 04. I can't communicate with it via I2C although I am able to program it.

During I2C session response alwas is FF-

I conclude miniprog3 failed, because I't worked with several chips in the morning, but now it don't wiht neither of them.

ALso there is a strange device listing. Can someone try listing devices connected.

Miniprog3 device listing (using List button:

Devices list:  8bit  7bit
     address:  0C    06
     address:  0E    07
     address:  1A    0D
     address:  26    13
     address:  32    19
     address:  3E    1F
     address:  4A    25
     address:  56    2B
     address:  62    31
     address:  64    32
     address:  70    38
     address:  7C    3E
     address:  7E    3F
     address:  8A    45
     address:  96    4B
     address:  A2    51
     address:  AE    57
     address:  BA    5D
     address:  BC    5E
     address:  CA    65
     address:  D6    6B
     address:  E2    71
     address:  EE    77
     address:  FA    7D
 

I found there is a 5.01V on SCL line where chip supply is 4.9V

I definitely comes from MiniProg. I2C standard doesn't mention about puting power to SCL

Regards

Robert

Does anyone know what means Voltage: 2760mV in Bridge Control Panel status bar?

I found, that when Vtarg (chip supply) is disconnected from the chip with SCL and SDA

connected the voltage shows 4180mV (although the output voltage is 5010mV). At the same time SCL

line supplies with 5010mV. It's like SCL line power supply.

But when Vtarg connected, voltage displayed drops to 2760mV.  although VCC is still 5010mV.

I think the voltage in status window  is the one on sda line. It's app the same when miniprog3 disconnected.

But when connected to the chip all pins voltage is 5V, although the status window shows 2760mV

The strane is that on bare chip ( without anything) I2CBridge works well

Secondly when I toggle power off the power pins don't switch off the power.

I have a circuit, which switch on power when Miniprog switch it on.

I expected the miniprog to take off power when toggled.

And it worked well, but suddenly, it doesn't want to take off power any more. I must replug USB socket.

Does anyone know the link for older then 2.05 firmware?

Regards

Robert

I think that POwer on SCL PIn of MiniProg3  is cause of circuit damage.

I have already two of such boards which suddenly stopped responding to MINIPRO3 I2C.

An there is so little info in MiniProg itself. I have the reason to say that Miniprog3 doesn't isolate

you from USB ground.

It is possible, that if Ground potential of USB is different of Power Supply then You have problems.

regards

robert

The miniprog3 when toggled power on uncoditionally powers up SCL line (when under I2C Bridge to USB mode)

I'm shocked. This I haven't expected.

My circuit is switching on the power to the board, based on VTARG power.

If regardless of Vtarg power on  the power on the circuit don't appear, the SCL line becomes power supply, whick in my case damage the circuit.

Regards

Robert