标题: Problem with VCCQ EMMC via ISP [打印本页] 作者: STALKER_71 时间: 2020-10-10 04:03 标题: 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?作者: admin 时间: 2020-10-10 11:18
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.作者: STALKER_71 时间: 2020-10-11 16:26
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.