Cyclone 10 GX continiously increasing power consumption

[epissadakis]

Hello,

We developed two custom evaluation boards (different layouts) using  the Cyclone 10CX150YU484E5G FPGA .

Our problem is that we face the same increasing power consumption issue in both development boards.

Before and after  the FPGA placement we measured all  the point of loads on the PCB and there was no short circuit. The FPGA is biased correctly in every pin. We also followed the guidelines for the power-up sequence.

After placing the FPGA we stated the  following issues:

1.The un-programmed  FPGA   increased gradually  the current consumption of the boards  and it was  also heated a lot.

2. Before the FPGA programming the GPIOs of all the banks outcome "high" values.

3.After the successful  FPGA programming  through JTAG and AS  the rate of the current  consumption dramatically increased.

Do you have any ideas regarding the cause of this behavioral in any of the above mentioned issues ?

Regards,

[Farabi]

Hello,

Are you able to check if there is connection leakage(shorted) between VCC and GND somewhere on the PCB?

regards,

Farabi

[epissadakis]

Hello,

We checked  it and seems that there is no connection leakage between VCC and GND. 

We cannot understand why in  an un-programmed FPGA all the pins are  in logic "high" .

Could this cause the increasing power consumption ?

Regards

Manolis

[NurAiman_M_Intel]

Hi,

Can you test by using power analyzer tool to see which part show high power consumption?

Regards,

Aiman

[FvM]

Hi,
- having GPIO pulled high (by weak pull-up resistor in 10k range) in unconfigured state is regular behaviour, just read the manual. Also unused pins are equipped with weak pull-up by default, different behaviour can be however assigned in device and pin options.

- FPGA current consumption is mainly caused by dynamic losses. Respectively it depends on clock frequency and amount of switching registers, in other words - on your design. It's usually higher in configured state.

There are nevertheless many ways to achieve excessive current consumption by hardware design faults, particularly for a FPGA like Cyclone 10 GX that has power sequencing requirements.

we don't yet know what is "dramatical increase" for you, e.g. what's the FPGA package temperature rise?

Regards
Frank

[NurAiman_M_Intel]

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