{"id":9822,"date":"2026-07-06T11:10:23","date_gmt":"2026-07-06T11:10:23","guid":{"rendered":"https:\/\/materialparts.com\/bma400\/"},"modified":"2026-07-06T11:10:23","modified_gmt":"2026-07-06T11:10:23","slug":"bma400","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/bma400\/","title":{"rendered":"BMA400"},"content":{"rendered":"<h2>\u0646\u0638\u0631\u0629 \u0639\u0627\u0645\u0629 \u0639\u0644\u0649 \u0627\u0644\u0645\u0646\u062a\u062c<\/h2>\n<p>The BMA400 from Bosch Sensortec is an ultra-low power 3-axis digital accelerometer with 12-bit resolution. It features on-chip motion-triggered interrupt functions including step counter, activity recognition, orientation detection, and tap\/double-tap, consuming only 14.5uA at highest performance and 800nA in auto-wakeup mode.<\/p>\n<h2>\u0627\u0644\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0627\u0644\u0631\u0626\u064a\u0633\u064a\u0629<\/h2>\n<ul>\n<li>Type: 3-Axis Digital Accelerometer<\/li>\n<li>Manufacturer: Bosch Sensortec<\/li>\n<li>Resolution: 12-bit<\/li>\n<li>Acceleration Range: +\/-2g \/ +\/-4g \/ +\/-8g \/ +\/-16g<\/li>\n<li>Output Data Rate: 12.5Hz to 800Hz<\/li>\n<li>Current Consumption: 14.5uA (high performance), 3.5uA (low power), 800nA (auto-wakeup)<\/li>\n<li>Noise Density: 180ug\/sqrt(Hz) typical (high perf)<\/li>\n<li>Interface: SPI (3\/4-wire) and I2C<\/li>\n<li>FIFO: 1KB on-chip<\/li>\n<li>Interrupt Pins: 2<\/li>\n<li>On-chip Features: Step counter (<4uA total), Activity recognition, Orientation, Tap\/Double-tap<\/li>\n<li>Supply Voltage: 1.72V to 3.6V (VDDIO: 1.2V to 3.6V)<\/li>\n<li>Package: 12-pin LGA (2.0 x 2.0 x 0.95mm)<\/li>\n<li>Operating Temp: -40C to +85C<\/li>\n<li>RoHS: Compliant, Halogen-free<\/li>\n<\/ul>\n<h2>\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n<ul>\n<li>Ultra-low 14.5uA current at highest performance &#8211; 10x lower than competitors<\/li>\n<li>800nA auto-wakeup mode for always-on sensing<\/li>\n<li>Built-in step counter consuming only 4uA total<\/li>\n<li>Activity recognition (walking, running, standing)<\/li>\n<li>1KB FIFO reduces host MCU interrupts<\/li>\n<li>12-bit resolution with +\/-2g to +\/-16g ranges<\/li>\n<\/ul>\n<h2>\u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n<ul>\n<li>Wearable activity tracking<\/li>\n<li>Smart watch power management<\/li>\n<li>Fitness applications<\/li>\n<li>Drop detection for warranty logging<\/li>\n<li>IoT coin-cell powered devices<\/li>\n<li>Smart home window\/door sensing<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Product Overview The BMA400 from Bosch Sensortec is an ultra-low power 3-axis digital accelerometer with 12-bit resolution. It features on-chip motion-triggered interrupt functions including step counter, activity recognition, orientation detection, and tap\/double-tap, consuming only 14.5uA at highest performance and 800nA in auto-wakeup mode. Key Specifications Type: 3-Axis Digital Accelerometer Manufacturer: Bosch Sensortec Resolution: 12-bit Acceleration [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,42],"tags":[1108],"chip_brand":[221],"class_list":["post-9822","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-sensors","tag-bma400","chip_brand-bosch"],"acf":{"brief_explanation":"Ultra-low power 3-axis accelerometer, 14.5uA, step counter, I2C\/SPI, 2x2mm LGA, Bosch","date_code":"","package_case":"12-LGA (2.0 x 2.0 x 0.95mm)","in_stock":18892,"datasheet":"https:\/\/www.bosch-sensortec.com\/products\/motion-sensors\/accelerometers\/bma400","price":"$1.80 @ 1ku","product_introduction":"The BMA400 from Bosch Sensortec is an ultra-low power 12-bit 3-axis accelerometer consuming only 14.5uA at highest performance, with built-in step counter, activity recognition, and 1KB FIFO in a 2x2mm LGA package.","working_principle":"The BMA400 uses a capacitive MEMS sensing element where a proof mass suspended by silicon springs moves relative to fixed electrodes under acceleration. The change in capacitance is converted to a digital value by a sigma-delta ADC. The integrated DSP performs offset compensation, filtering, and feature detection (step counting, activity recognition, tap detection). The auto-wakeup mode periodically enables the sensor to check for motion events while consuming only 800nA average current.","pin_description":"<table><tr><th>Pin<\/th><th>Name<\/th><th>Function<\/th><\/tr><tr><td>1<\/td><td>VDD<\/td><td>Power supply (1.72-3.6V)<\/td><\/tr><tr><td>2<\/td><td>GND<\/td><td>Ground<\/td><\/tr><tr><td>3<\/td><td>SDA\/SDI\/SDO<\/td><td>I2C data \/ SPI data in\/out<\/td><\/tr><tr><td>4<\/td><td>SCL\/SCK<\/td><td>I2C clock \/ SPI clock<\/td><\/tr><tr><td>5<\/td><td>INT1<\/td><td>Interrupt output 1<\/td><\/tr><tr><td>6<\/td><td>INT2<\/td><td>Interrupt output 2<\/td><\/tr><tr><td>7<\/td><td>CS<\/td><td>SPI chip select (active low)<\/td><\/tr><tr><td>8<\/td><td>VDDIO<\/td><td>I\/O voltage supply (1.2-3.6V)<\/td><\/tr><tr><td>9-12<\/td><td>GND\/NC<\/td><td>Ground \/ No connect<\/td><\/tr><\/table>","application_scenarios":"<ul><li>Wearable activity tracking<\/li><li>Smart watch power management<\/li><li>Fitness applications<\/li><li>Drop detection for warranty logging<\/li><li>IoT coin-cell powered devices<\/li><\/ul>","alternative_models":"<table><tr><th>Model<\/th><th>Manufacturer<\/th><th>Key Spec<\/th><th>Package<\/th><\/tr><tr><td>ADXL362<\/td><td>ADI<\/td><td>3-axis ultra-low power<\/td><td>LGA-16<\/td><\/tr><tr><td>LIS2DW12<\/td><td>STMicro<\/td><td>3-axis ultra-low power<\/td><td>LGA-12<\/td><\/tr><tr><td>KX122-1037<\/td><td>Rohm\/Kionix<\/td><td>3-axis low power<\/td><td>LGA-12<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/9822","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/comments?post=9822"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/9822\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=9822"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=9822"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=9822"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=9822"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}