Hello,
I am using KITVR5510DA0EVM to test the Standby mode transition function.
When I tried to exit the Standby mode by "STBY pin = Low", VR5510 did not re-enter the Normal_M mode as expected, but a reset occurred. It looks as if the PGOOD and RSTB could not be released due to the VCOREMON_OV occurrence, making 8sTimer time out, thus entering Deep-FS and causing reset.
Is there any wrong I have do or any step I have miss?
operation is as follows:
The phenomenon is as follows:
After exit Debug Mode:
After Step 3:
After Step 5:
Looking forward to your reply.
Thank you very much!
*PS:Attached are the TBB script file I used and the OTP configuration file read out through the MIRROR window after reset.
解決済! 解決策の投稿を見る。
Hello Weilin,
please see below answers from an application engineer I have contacted.
DESCRIPTION
A1: Correct.
Dear Weilin,
please refer the section 23.8.4 in the VR5510 datasheet. To release the FS0B you need to fulfill three conditions. By default the Fault Error Counter is set to 1, you need to decrease it to 0 with a good watchdog refresh. And only after that release the FS0B. Otherwise the FS0B will be asserted again.
With Best Regards,
Jozef
Expect your reply.
Thank you very much.
Dear Weilin,
[A] This looks, that one of the BIST hasn't been done successfully after wake up from Standby. If either LBIST or ABIST1 fail, the RSTB and PGOOD are released, but FS0B remains stuck low and cannot be released. Please refer to the sections 23.9.1 and 23.9.2 in the VR5510 datasheet. Please check if the LBIST and ABIST1 have passed, by checking the ABIST1_OK and LBIST_PASS bits in the FS_DIAG_SAFETY register.
With Best Regards,
Jozef
Dear Weilin,
1. I compared the OTP configuration that read through the "NXP GUI-MIRROR-Mirrors OTP Export".I found that the Fail-safe part of the OTP configuration was inconsistent (Read OTP configuration in Normal & Read OTP configuration after exit Standby). For example, the VCORE monitoring voltage changes from 0.8V to 0.53750V, that is, after entering or exiting the Standby mode, the Fail-safe part of the OTP configuration is modified. Why does this happen?
[A] If the STBY timer expires the VR5510 goes to OFF mode and you need to load the fuses again with the requested data. You have the non-programmed version. Please refer to the Figure 4. in the VR5510 datasheet.
2. Whether the PGOOD and RSTB cannot be released due to the occurrence of VCOREMON_OV, causing the 8sTimer timeout reset VR5510?
[A] You can set the impact of the VCOREMON_OV by setting the VCOREMON_OV_FS_IMPACT bits in the FS_I_OVUV_SAFE_REACTION1 register. By default the VCOREMON_OV_FS_IMPACT bits are set to assert the FS0B and RSTB pins. If you have left it to default, then yes, the VCORE overvoltage will assert the RSTB pin. Impact on the PGOOD due to VCOREMON overvoltage must be defined in the OTP. In the RSTB2PGOOD_OTP bit. Please refer to the section 23.7.2, page 80.
With Best Regards,
Jozef
Hello Weilin,
please see below answers from an application engineer I have contacted.
DESCRIPTION
A1: Correct.