Analog Discovery 2 with error "PLL not locked"

[Wlodzimierzhepner]

Dear all,

we have some problem with the Analog Discovery 2 (210-321) device. While Waveforms starts, it just say that "PLL not locked" (see attachement). No matter of operating system or USB cable (tested on two computers, one with Win10 and the second with Win7 x64, with a few cables connected to the back of PC, etc.) Any other AD2 connected to this PC works correctly, only this one is problematic. Our customer told us that this issue is present since device were shipped to him. I tried the "DigilentAnalogDiscovery2UsbRepair" (Digilent - FTDI Config) tool, but it doesn't helps.

Device S/N: DA680EF

 

Could you please help me with solving the problem? This problem is similiar to described here:

but there is no solution working for me (as i wrote, other AD2 works correctly, so this is neither PC nor driver issue).

 

Thanks,

Best regards,

Wlodzimierz Hepner, BTC

 

[xc6lx45]

Hi,

just an observation: In the last screenshot, the message box reads "USB: 5.09 V 1058 mA".
Isn't the USB 2.0 limit 500 mA? Seems a bit high...

[Wlodzimierzhepner]

Dear XC6LX45,

the value is not stable - sometimes it is 63mA, at next test it is 78mA, and sometimes it exceed 1058 (is it possible - i'm not sure, but the device isn't getting hot while this readings)

[attila]

Hi @Wlodzimierzhepner

It looks like the clock generator of the device does not lock, LD_CLKD.
https://reference.digilentinc.com/reference/instrumentation/analog-discovery-2/reference-manual#clock_generator

Make sure you are using at least WaveForms version 3.7.5. This can be checked under Help/About.
https://reference.digilentinc.com/waveforms3
https://forum.digilentinc.com/topic/8908-waveforms-beta-download/

If the problem persists, it could be a cold solder on the oscillator or the inductions...
For warranty and replacement please contact support at digilentinc dot com specifying the Date of Purchase, Seller and Purchase Order/ Web order Number.

 

[Wlodzimierzhepner]

Dear Attila,

thank You for this answer. I am using WaveForms 3.7.5 64-bit Qt5.6.3 Windows 10 (and the same number on Win7). Using ver. 3.7.10. beta, the error persists. I will contact theSeller.

[attila]

Hello,

We received the replaced faulty device and it looks like the IC20 is blown up, which is rated to 6.5V
https://reference.digilentinc.com/reference/instrumentation/analog-discovery-2/reference-manual#analog_supplies_control
This could have been damaged by high voltage on USB, like a defective USB hub-supply.
The devices are tested and calibrated in the factory, so such damaged most probably happened after unpacking...

After bypassing the IC20 by wiring the VCC5V0 to AVCC5V0 the device is fully functional.
Luckily only the this IC got damaged and saved further ones.