i.MX ProcessorsのトピックiMX8 Nano DDR4 DRAM_VREF capacitor values https://community.nxp.com/t5/i-MX-Processors/iMX8-Nano-DDR4-DRAM-VREF-capacitor-values/m-p/1064975#M156518 <HTML><HEAD></HEAD><BODY><P>Looking at the NXP reference design for the iMX8 Nano with DDR4, there are some 1uF and 0.01uF capacitors used to filter the generated DRAM_VREF signal.&nbsp; Are these capacitor values critical? Specifically, is there any problem with using 4.7uF in those 3 locations? (Because we already have a bunch of 4.7uF's on the board, so I'd like to limit the number of BOM items - particularly that 0.01uF as it's the only one on the board.)</P><P></P><P>Thanks a lot.</P><P></P><P></P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_1.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/106710iD4F992FD93FDB7C4/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></P></BODY></HTML> Sat, 09 May 2020 00:36:55 GMT frank_vanhooft 2020-05-09T00:36:55Z iMX8 Nano DDR4 DRAM_VREF capacitor values https://community.nxp.com/t5/i-MX-Processors/iMX8-Nano-DDR4-DRAM-VREF-capacitor-values/m-p/1064975#M156518 <HTML><HEAD></HEAD><BODY><P>Looking at the NXP reference design for the iMX8 Nano with DDR4, there are some 1uF and 0.01uF capacitors used to filter the generated DRAM_VREF signal.&nbsp; Are these capacitor values critical? Specifically, is there any problem with using 4.7uF in those 3 locations? (Because we already have a bunch of 4.7uF's on the board, so I'd like to limit the number of BOM items - particularly that 0.01uF as it's the only one on the board.)</P><P></P><P>Thanks a lot.</P><P></P><P></P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_1.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/106710iD4F992FD93FDB7C4/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.png" alt="pastedImage_1.png" /></span></P></BODY></HTML> Sat, 09 May 2020 00:36:55 GMT https://community.nxp.com/t5/i-MX-Processors/iMX8-Nano-DDR4-DRAM-VREF-capacitor-values/m-p/1064975#M156518 frank_vanhooft 2020-05-09T00:36:55Z Re: iMX8 Nano DDR4 DRAM_VREF capacitor values https://community.nxp.com/t5/i-MX-Processors/iMX8-Nano-DDR4-DRAM-VREF-capacitor-values/m-p/1064976#M156519 <HTML><HEAD></HEAD><BODY><P>I am confirming it and give you reply as soon as possible.</P></BODY></HTML> Sat, 09 May 2020 05:55:09 GMT https://community.nxp.com/t5/i-MX-Processors/iMX8-Nano-DDR4-DRAM-VREF-capacitor-values/m-p/1064976#M156519 Rita_Wang 2020-05-09T05:55:09Z Re: iMX8 Nano DDR4 DRAM_VREF capacitor values https://community.nxp.com/t5/i-MX-Processors/iMX8-Nano-DDR4-DRAM-VREF-capacitor-values/m-p/1064977#M156520 <HTML><HEAD></HEAD><BODY><P>&nbsp; The C389 and C390 can change to 4.7uF from 1uF, please note the value of the two capacitor must be the same, But C110 can not be changed, C110&nbsp;and C389 are in parallel.</P></BODY></HTML> Sat, 09 May 2020 06:54:20 GMT https://community.nxp.com/t5/i-MX-Processors/iMX8-Nano-DDR4-DRAM-VREF-capacitor-values/m-p/1064977#M156520 Rita_Wang 2020-05-09T06:54:20Z