Problem with VCCQ EMMC via ISP
Hi, the XGecu T56 has a problem with the VCCQ power supply when the programming through the ISP connector and the vccq power is taken from the zif panel pins. If you put vcc3.3v \ vccq1.8v at the zif output of the panel vccq = 0.9-1.0v. I have to submit vccq separately external power. When I expose vcc3.3v \ vccq3.3v Everything is fine and vccq is 3.3v. Why is voltage so low at 1.8? [b]回复 [url=http://forums.xgecu.com/redirect.php?goto=findpost&pid=330&ptid=104]1#[/url] [i]STALKER_71[/i] [/b]ISP no 1.8V VCCQ.
[url=http://forums.xgecu.com/viewthread.php?tid=71&]http://forums.xgecu.com/viewthread.php?tid=71&[/url];extra=page%3D1 Isp no vccq but zif panel have vccq and it low 0.9-1v. If i take VCCQ power from this pins voltage 0.9v [b]回复 [url=http://forums.xgecu.com/redirect.php?goto=findpost&pid=334&ptid=104]4#[/url] [i]STALKER_71[/i] [/b]
Since there is only one VCC voltage inside the programming hardware, when VCCQ=VCC, VCCQ exists, but when VCCQ=1.8V and VCC=3.3V, VCCQ is high impedance. Generally when using ISP, use external the board's power supply instead of the optional power of the programmer. That's what I do. Indicate it in the description. For a long time I figured out why there was no connection with emmc until I measured the power.
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