Hello,
我们使用DA9062-10AM与VARIANT NUMBER -10（对于ZYNQ设备）。DA9062用于为ARTIX-7 FPGA供电，但仅用P1V0，P1V8和P3V3（见附件）。不使用P1V35和P0V675。
工作48小时后，我们开始电路板的电源，DA9062无法启动：LDO和降压都没有产生电压。
We do not understand what is happening and it's the same problem on 3 cards... Does not using all programmed outputs can be a problem?
此致，
Arnaud.
Attachment:
Device:
Hello Arnaud,
Let me take a quick look at your schematic. Are you using the DA9062 in system or with the eval board? Have you tested the DA9062 with the eval board?
Could you send me your ini file?
Kind regards,
Elliott Dexter
Hello,
我们正在使用我们的团队设计的定制板上的DA9062。没有用eval板测试。
我们选择DA9062-10AM because this variant is pre-programmed with the good voltage for an Xilinx Artix-7 device. So I have no ini file.
Our schematic of DA9062 is based on the Minized board from Avnet, with the difference that we don't use the following voltages : 1V35, 0V675, VREF_0V675. But we have kept the passive components (L,C) around the unused voltages.
To be more precise about the problem, the DA9062 and the board work well during 48 hours, but after this time, the DA9062 do not start and none of the output (buck, LDO) provide voltage. It's the same problem on 3 boards.
此致。
Arnaud
Hello Arnaud,
当你说DA9062没有启动时，你是在打开和关闭PMIC的情况下为PMIC推送，还是只看到稳压器关闭？
What is the supply voltage when you see the regualtors turn off?
Kind regards,
Elliott Dexter
The PMIC does not start after a power ON of the supply voltage (P5V on the schematic).
Hello Arnaud,
Could you capture the waveform on Vsys(C162) at start-up, we will need to make sure that there is no droop on this pin at start-up?
您还可以检查C183上的VDDCORE电压，电源时，此电压应为2.5 V？
As a quick test, we should try issuing a wake-up event. Could you ground, the chip side of the R179 resistor for 1 second?
On the schematic side:
Is there a pull-up on the nRESET line?
Are there pull-up's on the I2C lines?
Kind regards,
Elliott Dexter
Hello,
我会通过所要求的测试结果来回复您。
On the schematic side :
1- Actually there is no pullup on the nRESET line but we can easily add it.
2- There is no pull up on the I2C line but we can add it in the FPGA IOB.
此致。
你好艾略特，
I have done the test at start up on Vsys (C162).
我们使用外部供应，这一个在某个时间（不是所有的时间）一列短脉冲的火车（脉冲小于1，脉冲）高达19伏。
这是问题吗？当它发生时，它可能对DA9062可能破坏了吗？
此致。
Arnaud.
Hello Arnaud,
What was the result of the wake up event? Did you see the PMIC turn on?
应用电源时的VDDCORE电压是多少？
Section 2 of the datasheet lists the absolute maximum ratings of the device. Exceeding these ratings may cause permanent damage to the device. Device functionality is only guaranteed under the conditions listed in section 3 and section 4 of the dataseet. Operating the device in conditions exceeding those listed in Sections 3 and 4, but compliant with the absolute maximum ratings listed in Table 4, for extended periods of time may affect device reliability.
Kind regards,
Elliott Dexter
Hello Arnaud,
Could you also send me the waveform on Vsys?
Kind regards,
Elliott Dexter
你好艾略特，
The wake up event don't do anything, the PMIC stay OFF. And VDDCORE voltage is 0V.
The probleme is probably due to damage caused by the spikes generated by external power supply.
On one of the 3 board with the problem, my team has done several power and power off sequence. After a moment the external power supply goes in current limitation state and the temperature off the PMIC increase very fastly. On this board the power supply goes in limitation after each start-up, so I think the PMIC is dead.
This external power supply is actually used to do adjustement on the board, but the board will be placed in a system with is own power supply.
为了防止最终系统中的这个问题，我们正在表征其电源。
谢谢你的帮助。
此致，
Arnaud.
Hello Arnaud,
我认为DA9062已损坏。进入CC的电源，没有调节因子的可能是可能的。
您对供应限额有何限制？
Kind regards,
艾略特·德克瑟
你好艾略特，
我也这么想。
During the tests, the current limit was set at 0.5A. After the first time the power supply gone into limitation, we have tested with 1A and 2A.
Arnaud.
Hello Arnuad,
If it hitting the limits at 1 - 2 A and we can’t see any of the rails attempting to start, then the chip is damaged and would suggest using a new part with a more stable power supply.
Will the final device have a more stably supply?
What is the end application?
Kind regards,
Elliott Dexter
Hello,
We are changing the damaged PMIC on 2 boards. I think (and I hope) it will be good after the modification.
Currently, we are testing the power supply of the final system to control its stability at startup and during the operation.
最终应用是用于船舶探针的阻抗测量系统。
Arnaud.