lionelc
Newbie level 1
Hi,
My 32-bit secure processor needs the following power supply lines:
- 3.3v (for IOs) VIO
- 1.8v (for the digital core) VCORE
- 1.8v (for the battery backup registers) VBAT
By default my product is turned off and only the battery backed unit (3v) is used through a 1.8v regulator to maintain the specific registers of the secure area.
When the product is powered up by using the main power line plug, some transient/noise/glitches appear on the VBAT power supply.
The main power supply is 8.2v than I generate 3.3v than 1.8v.
My concern is that I want to get rid of them to be sure that my secure processor does not trigger an alarm and erase the abttery backed registers.
I have attached two snapshots of the start-up phase.
I have tried to use capacitor and ferrite.
Can I use a Transient Voltage Suppressor in this case? The glitches are in the frequency of ~10MHz.
Should I use a zener? I want to get rid of the over-shoot but also the under-shoot, is this the proper component?
Do you have something to recommend?
Thank you for your help
My 32-bit secure processor needs the following power supply lines:
- 3.3v (for IOs) VIO
- 1.8v (for the digital core) VCORE
- 1.8v (for the battery backup registers) VBAT
By default my product is turned off and only the battery backed unit (3v) is used through a 1.8v regulator to maintain the specific registers of the secure area.
When the product is powered up by using the main power line plug, some transient/noise/glitches appear on the VBAT power supply.
The main power supply is 8.2v than I generate 3.3v than 1.8v.
My concern is that I want to get rid of them to be sure that my secure processor does not trigger an alarm and erase the abttery backed registers.
I have attached two snapshots of the start-up phase.
I have tried to use capacitor and ferrite.
Can I use a Transient Voltage Suppressor in this case? The glitches are in the frequency of ~10MHz.
Should I use a zener? I want to get rid of the over-shoot but also the under-shoot, is this the proper component?
Do you have something to recommend?
Thank you for your help
