UCD90320: Config Query

Hi Yihe!
Thankyou for your response!

Is it possible to update manufacturing-related registers during runtime, and how can we ensure these updates are preserved even after a power cycle? Could you also outline a procedure for testing this functionality


I tried setting the PWM frequency for the UCD90320 and UCD90160 devices, but the hardware configuration indicates the minimum frequency is 15.275 kHz. Is there a way to set a lower PWM frequency in the range of 1 Hz–10 Hz?

Hi Yihe,

Thanks for your response.
I plan to make permanent changes (i.e., writing data to the NVM) on one of my cards. Are these NVM writes supported on both the UCD90160A and UCD90320 devices? Also, are there any limitations on the number or frequency of NVM flash writes for these devices?

Best Regards,
Sunil

Hi Yihe,

From the datasheets, it appears that the UCD90320 devices support up to 100k program/erase cycles for the flash memory, while the UCD90160A devices support up to 20k write cycles. Does this mean we can expect to use up to that many write cycles for our application? Please let me know if my understanding is correct.

Hi Yihe,

I tried the following steps to write data into the UCD’s flash memory, but the updated value isn’t retained after a power cycle. The MFR_REVISION register is 12 bytes, and I can successfully write and read it during runtime; however, after a power cycle, the updated value reverts to the older configuration. Could you please review these steps and provide the correct procedure for permanently storing data in the NV flash?

Steps:

1. Write 0x9B with 0x123456789ABC

2. Write 0x11 (Send Byte Only command)

3. Read 0x9B → returns 0x123456789ABC

4. Power cycle

5. Read 0x9B → returns 0x3231 (original config), not the new value

Thank you for your help,
Sunil

Hi Yihe,

Thank you — it seems to be working with the SAA tool.

I had a couple of follow-up questions:

1. Delay Between MFR Register Write and Flash Storage on UCD Devices
   For PMBus master-to-slave communication, is there any specific delay required between writing to MFR space-specific registers and issuing a Store Default All (11h) command to ensure successful flash programming?

2. GPI-Based Fault Shutdown on UCD90320
   I'm trying to implement rail shutdown and resequencing using an external GPI input. While the UCD90160 device offers a configurable option to fault shutdown rails based on a GPI trigger, I couldn’t locate a similar setting in the UCD90320 GUI.
   Could you please confirm if this feature exists for UCD90320, and if not, suggest an alternate implementation method?
   
   
   

3. PMBus Command Sequence for Resequencing and Power Down
   Could you share the correct PMBus command sequence to:

   • Trigger a resequence of rails

   • Power down the rails gracefully

Attached above are relevant GUI screenshots for your reference.

Thanks again for your support!

Hi Yihe

I tried to set through GPI fault response after assigning the functionality.  but the tool crashes with fatal programming error, can you try it once on your setup. 
To set GPI to this.

Thanks Yihe with this tool option seems to be selecting without tool crash.

So my understanding is that with GPI input low the UCD will trigger a resequence of all the rails now?

based on GPI Fault response?

Thanks Yihe, 

Do you have a sequence on how to control GPIO through commands?

Assume i am setting it to 1 by default can i change it back to 0 through PMBUS commands?