{"id":2206,"date":"2019-07-02T10:10:23","date_gmt":"2019-07-02T10:10:23","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=2206"},"modified":"2023-08-18T14:49:41","modified_gmt":"2023-08-18T09:19:41","slug":"optimizing-o-power-consumption","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/optimizing-o-power-consumption\/","title":{"rendered":"STM32 GPIO Lecture 7 : Optimizing I\/O power consumption"},"content":{"rendered":"<div class=\"boldgrid-section color4-background-color color-4-text-contrast bg-background-color\">\n<div class=\"container\">\n<div class=\"row\" style=\"padding-top: 50px; padding-bottom: 50px;\">\n<div class=\"col-md-1 col-sm-12 col-xs-12 col-lg-1\">\n<p class=\"\">&nbsp;<\/p>\n<\/div>\n<div class=\"col-md-10 col-sm-12 col-xs-12 col-lg-10\">\n<h2 class=\"h1 color2-color\" style=\"text-align: center;\">Optimizing I\/O power consumption<\/h2>\n<div class=\"row bg-editor-hr-wrap\" style=\"margin-top: 2px; margin-right: 47px; margin-left: -67px;\">\n<div class=\"col-md-12 col-xs-12 col-sm-12 col-lg-12\">\n<div>\n<p>&nbsp;<\/p>\n<hr class=\"bg-hr bg-hr-11\" style=\"color: #080019;\">\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<\/div>\n<p class=\"\" style=\"border-width: 0px; font-size: 17px; font-family: 'Roboto Slab'; font-weight: 400; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400;\">If an input pin is floating, it may result in leakage current from VCC to the ground.<\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400;\">First, let&#8217;s take the case of an input pin, that is not floating, but fixed to VCC or ground. The given Figure1 and 2 are input buffer circuitry inside the MCU.&nbsp;<\/span><\/p>\n<p>&nbsp;<\/p>\n<figure id=\"attachment_2208\" aria-describedby=\"caption-attachment-2208\" style=\"width: 596px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-2208\" style=\"width: 469px;\" src=\"http:\/\/fastbitlab.com\/wp-content\/uploads\/2019\/07\/Screenshot-109.png\" alt=\"\" width=\"596\" height=\"404\"><figcaption id=\"caption-attachment-2208\" class=\"wp-caption-text\">Figure1.Input buffer circuitry with input pin connected to VCC<\/figcaption><\/figure>\n<p class=\"\">&nbsp;<\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400;\">When the pin is in high voltage, T1 is ON, and T2 is OFF. Hence, there is no path for the current to reach the ground. So, in this case, leakage will not happen, since the current never leaks out from the +VCC to ground.<\/span><\/p>\n<p class=\"\">&nbsp;<\/p>\n<figure id=\"attachment_2209\" aria-describedby=\"caption-attachment-2209\" style=\"width: 447px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-2209\" src=\"http:\/\/fastbitlab.com\/wp-content\/uploads\/2019\/07\/Screenshot-110.png\" alt=\"Optimizing I\/O power consumption\" width=\"447\" height=\"278\" srcset=\"https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-110.png 799w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-110-300x187.png 300w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-110-768x478.png 768w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-110-600x373.png 600w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-110-320x200.png 320w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-110-120x75.png 120w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-110-500x311.png 500w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-110-200x124.png 200w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2019\/07\/Screenshot-110-400x249.png 400w\" sizes=\"(max-width: 447px) 100vw, 447px\" \/><figcaption id=\"caption-attachment-2209\" class=\"wp-caption-text\">Figure2.Input buffer circuitry with input pin connected to ground<\/figcaption><\/figure>\n<p class=\"\">&nbsp;<\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400;\">When the pin is in low voltage, T1 is OFF, and T2 is ON because the current from VCC cannot reach the ground. So, in this case, there is no leakage.<\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400;\">Let&#8217;s come to the floating state. In this case, the pin&#8217;s input voltage not fixed. So, due to the circuit noise, the input voltage may toggle between 50% or 70% of the VCC, which means voltage on the pin may go somewhere in this region. Then both the transistors turn ON&nbsp; with some resistance. So, as a result, a small amount of current sink into the ground taking this path.<\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400;\">But all new microcontroller input buffers use a Schmitt trigger to avoid noise issues.<\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"color: #000000;\">In the following article, let&#8217;s see<\/span> <span style=\"color: #ff6600;\"><a style=\"color: #ff6600;\" href=\"http:\/\/fastbitlab.com\/gpio-programming-structure\/\" target=\"_blank\" rel=\"noopener\">GPIO Programming Structure<\/a>.<\/span><\/p>\n<p class=\"\">&nbsp;<\/p>\n<p class=\"\" style=\"border-width: 0px; font-size: 17px; line-height: 30px; font-family: Poppins; font-weight: 400;\" data-font-family=\"Poppins\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"color: #000080;\"><b>FastBit Embedded Brain Academy Courses<\/b><\/span><\/p>\n<p class=\"\"><span style=\"color: #000000;\">Click here:<\/span>&nbsp;<span style=\"color: #0000ff;\"><a style=\"color: #0000ff; text-decoration: underline;\" href=\"http:\/\/fastbitlab.com\/course1\" target=\"_blank\" rel=\"noopener\">https:\/\/fastbitlab.com\/course1<\/a><\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"row\">\n<div class=\"col-md-12 col-xs-12 col-sm-12 col-lg-12\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; Optimizing I\/O power consumption &nbsp; &nbsp; If an input pin is floating, it may result in leakage current from VCC to the ground. First, let&#8217;s take the case of an input pin, that is not floating, but fixed to VCC or ground. The given Figure1 and 2 are input buffer circuitry inside the MCU.&nbsp; [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2208,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"0","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"0","ocean_custom_header_template":"0","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"off","ocean_gallery_id":[],"footnotes":""},"categories":[8],"tags":[20],"class_list":["post-2206","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-stm32-gpio","entry","has-media"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Efficient I\/O Power Management and Leakage Control in Microcontroller Systems<\/title>\n<meta name=\"description\" content=\"Learn how to optimize I\/O power consumption by preventing leakage currents in microcontroller input buffer circuitry. 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