{"id":154780,"date":"2025-07-23T17:05:07","date_gmt":"2025-07-23T09:05:07","guid":{"rendered":"https:\/\/www.opteeq.com\/en\/?p=154780"},"modified":"2025-07-23T17:05:10","modified_gmt":"2025-07-23T09:05:10","slug":"sg400e-power-supply-mode-full-analysis-3-solutions-for-precise-matching","status":"publish","type":"post","link":"https:\/\/www.opteeq.com\/en\/news\/sg400e-power-supply-mode-full-analysis-3-solutions-for-precise-matching\/","title":{"rendered":"SG400E power supply mode full analysis: 3 solutions for precise matching"},"content":{"rendered":"\n
\n

Did the chip get damaged due to the wrong power connection during programming? The voltage of the target board and the programmer does not match? The triple power supply solution of OPTEEQ SG400E from OPTEEQ Technologies can help you solve the power supply problem during programming!<\/p>\n\n\n\n

<\/p>\n<\/blockquote>\n\n\n\n

1. Why is the power supply mode so critical?<\/h1>\n\n\n\n

<\/p>\n\n\n\n

SG400E provides three power supply modes when programming chips: programmer power supply<\/strong>, external power supply<\/strong>, and voltage follower<\/strong>.<\/p>\n\n\n\n

<\/p>\n\n\n\n

Impact of power supply mode\uff1a<\/h3>\n\n\n\n
    \n
  • \u2705 Chip safety (overcurrent\/overvoltage risk)<\/li>\n\n\n\n
  • \u2705 Signal stability (I\/O level matching)<\/li>\n\n\n\n
  • \u2705 System compatibility (self-powered\/unpowered target board)<\/li>\n<\/ul>\n\n\n\n

    <\/p>\n\n\n\n

    \n\n\n\n

    <\/p>\n\n\n\n

    2. Detailed explanation of 3 power supply modes<\/h1>\n\n\n\n

    <\/p>\n\n\n\n

    \n

    2.1 Programmer Power Supply<\/strong><\/p>\n\n\n\n

    <\/p>\n<\/blockquote>\n\n\n

    \n
    \"Article
    Programmer power supply option interface<\/figcaption><\/figure><\/div>\n\n\n

    As the name implies, the programmer supplies power to the target chip. In this mode:<\/p>\n\n\n\n

    \u26a1I\/O port power supply: provided by SG400E according to the voltage setting of the project.<\/p>\n\n\n\n

    \u26a1Target board power supply: provided by SG400E.<\/p>\n\n\n

    \n
    \"Article
    Wiring diagram of the Programmer power supply<\/figcaption><\/figure><\/div>\n\n\n

    Wiring in the programmer power supply mode:<\/p>\n\n\n\n

    \ud83d\udd17 Programmer VCC and target board VCC: connected<\/strong>\u2705<\/p>\n\n\n\n

    \ud83d\udd17 Programmer I\/O and target board I\/O: connected<\/strong>\u2705<\/p>\n\n\n\n

    \ud83d\udd17 Target board external power supply: disconnected\u274c<\/strong><\/p>\n\n\n\n

    <\/p>\n\n\n\n

    \u2b55It is important to note that:<\/strong><\/p>\n\n\n\n

      \n
    1. Some chips need to control the output voltage, so they must be powered by a programmer during programming. The relevant precautions will be explained in the corresponding chip option description document.<\/li>\n\n\n\n
    2. The maximum total output current of a single channel of the programmer (I total\u00a0= I VCC+ I IO) cannot exceed 350mA<\/strong>.<\/li>\n<\/ol>\n\n\n\n

      <\/p>\n\n\n\n

      \n

      2.2 External Power Supply<\/strong><\/p>\n\n\n\n

      <\/p>\n<\/blockquote>\n\n\n

      \n
      \"Article
      External power supply option interface<\/figcaption><\/figure><\/div>\n\n\n

      External power supply<\/strong> means that the target board is powered by an external power supply, and the programmer only powers the I\/O port. In this mode:<\/p>\n\n\n\n

      \u26a1I\/O port power supply: provided by SG400E according to the voltage set in the project.<\/p>\n\n\n\n

      \u26a1Target board power supply: provided by an external power supply.<\/p>\n\n\n

      \n
      \"Article
      Wiring diagram of the External power supply<\/figcaption><\/figure><\/div>\n\n\n

      Wiring in external power supply mode:<\/p>\n\n\n\n

      \ud83d\udd17 Burner VCC and target board VCC: disconnected\u274c<\/strong><\/p>\n\n\n\n

      \ud83d\udd17 Burner I\/O and target board I\/O: connected<\/strong>\u2705<\/p>\n\n\n\n

      \ud83d\udd17 Target board external power supply: connected<\/strong>\u2705<\/p>\n\n\n\n

      \n

      2.3 Voltage Follower<\/strong><\/p>\n<\/blockquote>\n\n\n

      \n
      \"Article
      Voltage follower option interface<\/figcaption><\/figure><\/div>\n\n\n

      Voltage following means that both VCC and I\/O ports are powered by external power. In this mode:<\/p>\n\n\n\n

      \u26a1I\/O port power supply: The I\/O port voltage automatically follows the target board VCC voltage.<\/p>\n\n\n\n

      \u26a1Target board power supply: Provided by external power supply.<\/p>\n\n\n

      \n
      \"Article
      Wiring diagram of the Voltage follower<\/figcaption><\/figure><\/div>\n\n\n

      Wiring in voltage follower mode:<\/p>\n\n\n\n

      \ud83d\udd17 Burner VCC and target board VCC: connected<\/strong>\u2705<\/p>\n\n\n\n

      \ud83d\udd17 Burner I\/O and target board I\/O: connected<\/strong>\u2705<\/p>\n\n\n\n

      \ud83d\udd17 Target board external power supply: connected<\/strong>\u2705<\/p>\n\n\n\n

      <\/p>\n\n\n\n

      \n\n\n\n

      <\/p>\n\n\n\n

      3. Summary<\/h1>\n\n\n\n

      <\/p>\n\n\n\n

      Mode<\/th>VCC Power Supply<\/th>I\/O Power Supply<\/th>VCC Wiring<\/th>I\/O Wiring<\/th>External Power Supply<\/th><\/tr><\/thead>
      Programmer Power Supply<\/td>SG400E<\/td>SG400E<\/td>Connected<\/td>Connected<\/td>Disconnected<\/td><\/tr>
      External Power Supply<\/td>Target Board External Power Supply<\/td>SG400E<\/td>Disconnected<\/td>Connected<\/td>Connected<\/td><\/tr>
      Voltage Follow<\/td>Target Board External Power Supply<\/td>Target Board External Power Supply<\/td>Connected<\/td>Connected<\/td>Connected<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      \n

      FAQs<\/strong><\/p>\n<\/blockquote>\n\n\n\n

      Q: The target board has a power supply, which mode should I choose?<\/p>\n\n\n\n

      A: Give priority to external power supply mode, disconnect the VCC connection of the programmer, and avoid double-side power supply.<\/p>\n\n\n\n

      <\/p>\n\n\n\n

      \n\n\n\n

      <\/p>\n\n\n\n

      Q: When programming, it shows that VCC has no voltage. How to check?<\/p>\n\n\n\n

      A: 1. Check the power supply settings in the project settings \u2192 Check if the voltage follower is selected but the VCC is not connected to the target board. 2. Check if the target board needs an ignition signal, whether there is a watchdog on the target board, etc. that requires special processing.<\/p>\n","protected":false},"excerpt":{"rendered":"

      Did the chip get damaged due to the wrong power connection during programming? The voltage of the target board and the programmer does not match? The triple power supply solution of OPTEEQ SG400E from OPTEEQ Technologies can help you solve the power supply problem during programming! 1. Why is the power supply mode so critical? […]<\/p>\n","protected":false},"author":64,"featured_media":154782,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"themepark_post_bcolor":"#f5f5f5","themepark_post_width":"1022px","themepark_post_img":"","themepark_post_img_po":"left","themepark_post_img_re":false,"themepark_post_img_cover":false,"themepark_post_img_fixed":false,"themepark_post_hide_title":false,"themepark_post_main_b":"","themepark_post_main_p":100,"themepark_paddingblock":false,"footnotes":""},"categories":[22],"tags":[],"class_list":["post-154780","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"metadata":{"_edit_lock":["1753261511:64"],"views":["45"],"_edit_last":["64"],"catce":["sidebar-widgets4"],"_thumbnail_id":["154782"]},"medium_url":"https:\/\/www.opteeq.com\/en\/wp-content\/uploads\/sites\/2\/2025\/07\/\u5c01\u9762-300x169.jpg","thumbnail_url":"https:\/\/www.opteeq.com\/en\/wp-content\/uploads\/sites\/2\/2025\/07\/\u5c01\u9762-150x150.jpg","full_url":"https:\/\/www.opteeq.com\/en\/wp-content\/uploads\/sites\/2\/2025\/07\/\u5c01\u9762.jpg","_links":{"self":[{"href":"https:\/\/www.opteeq.com\/en\/wp-json\/wp\/v2\/posts\/154780","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.opteeq.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.opteeq.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.opteeq.com\/en\/wp-json\/wp\/v2\/users\/64"}],"replies":[{"embeddable":true,"href":"https:\/\/www.opteeq.com\/en\/wp-json\/wp\/v2\/comments?post=154780"}],"version-history":[{"count":1,"href":"https:\/\/www.opteeq.com\/en\/wp-json\/wp\/v2\/posts\/154780\/revisions"}],"predecessor-version":[{"id":154781,"href":"https:\/\/www.opteeq.com\/en\/wp-json\/wp\/v2\/posts\/154780\/revisions\/154781"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.opteeq.com\/en\/wp-json\/wp\/v2\/media\/154782"}],"wp:attachment":[{"href":"https:\/\/www.opteeq.com\/en\/wp-json\/wp\/v2\/media?parent=154780"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.opteeq.com\/en\/wp-json\/wp\/v2\/categories?post=154780"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.opteeq.com\/en\/wp-json\/wp\/v2\/tags?post=154780"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}