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The design uses a two-stage differential amplifier with externally controlled gain and bandwidth, followed by a window comparator and a digital filter shaped by an external RC network. Mode selection supports Single Pulse, Concurrent Pulse, and Dual Pulse behaviors, with programmable one-shot pulse widths and timing windows for retriggerable output generation. Outputs include LED/relay open-drain options and optional undervoltage detection, plus a 5V shunt regulator output on LS6511N.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/ls6511n-pir-sensor-interface-programmable-retriggerable-one-shots/562973/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/ls6511n-pir-sensor-interface-programmable-retriggerable-one-shots/562973.png","ImageObject",300,407,{"name":92,"@type":93},"dawugda","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-14","2026-10-12",true,{"@type":102,"interactionType":103,"userInteractionCount":34},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What motion-detection pipeline does the LS6511N family use?","Question",{"text":112,"@type":113},"It uses a two-stage differential amplifier followed by a window comparator for threshold-based signal selection, then a comparator digital filter that requires motion to persist for a set duration before pulses appear.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How do SP, CP, and DP modes differ?",{"text":117,"@type":113},"In Single Pulse (SP) mode, detection from either positive or negative input produces an output; Concurrent Pulse (CP) requires detection from positive and negative within a specific time; Dual Pulse (DP) triggers when any two detections occur within a defined time window.",{"name":119,"@type":110,"acceptedAnswer":120},"What does the undervoltage detection feature do?",{"text":121,"@type":113},"For LS6511N, undervoltage is detected when the supply drops below about 3.5V and is removed when it rises above about 3.7V, helping detect tampering that loads the power supply. LS6512 does not respond to undervoltage detection, while LS6513 can be selected to respond or not.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},562973,1791865197,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":34,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":24,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":144},3985747870947,"https://ap-avatar.wpscdn.com/davatar_3d24733baf745e90a7e4bdd5f77d97b2","LSI/CSI  \nLS6511N LS6512 LS6513  \nL LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405  \nA3800  \n| PIR SENSOR INTERFACE September 2009 |  |\n| --- | --- |\n| FEATURES:\u003Cbr>• Direct Interface with PIR Sensor\u003Cbr>• Two-Stage Differential Amplifier\u003Cbr>• Amplifier Gain and Bandwidth externally controlled\u003Cbr>• True and Complementary Output Drives\u003Cbr>• Separate digital filters for processing positive and negative input signals\u003Cbr>• Single Pulse/Dual Pulse/ Concurrent Pulse Detection\u003Cbr>• Adjustable Output Pulse Width\u003Cbr>• Optional 5V Shunt Regulator Output\u003Cbr>• 75µA Typical Supply Current\u003Cbr>• Undervoltage Detection\u003Cbr>• LS6511N(DIP); LS6511N-S (SOIC) -See Figure 1ALS6512(DIP); LS6512-S (SOIC) -See Figure 1ALS6513(DIP); LS6513-S (SOIC) -See Figure 1B\u003Cbr>APPLICATIONS:\u003Cbr>Security system intrusion detection, automatic doors, motion triggered events such as remote animal photography, etc.\u003Cbr>DESCRIPTION (See Figure 5)\u003Cbr>The LS6511N, LS6512 and LS6513 are CMOS integrated circuits designed for detecting motion from a PIR Sensor and initiating appropriate responses.\u003Cbr>DIFFERENTIAL AMPLIFIER\u003Cbr>Each stage of the two stage Differential Amplifier can be set to have its own amplification and bandwidth. The two inputs to the first stage allow for single-ended or differential connection to PIR Sensors. This stage can be biased anywhere in its dynamic range. The second stage is internally biased so that the Window Comparator’s lower and higher thresholds can be fixed relative to this bias. Signal levels as low as 100µV can be detected.\u003Cbr>WINDOW COMPARATOR\u003Cbr>The Window Comparator provides noise filtering by enabling only those signals equal to or greater than a fixed threshold at the output of the Differential Amplifier to appear at the 2 outputs of the Window Comparator. One output detects positive input signals while the other output detects negative input signals.\u003Cbr>COMPARATOR DIGITAL FILTER\u003Cbr>The outputs of the Window Comparator are filtered so that motion must be present for a certain duration before it can be recognized and appear as pulses at the Digital Filter outputs. An external RC network sets the duration time. Nominal duration is 50ms.\u003Cbr>MODE SELECT\u003Cbr>A tristate input pin selects how the detected signals are processed. Single Pulse (SP) Mode is when detection from either a positive or negative input signal at the Digital Filter outputs will cause an LED / RELAY output to occur. Concurrent Pulse (CP) Mode is when detection from a positive and negative input signal must occur within a specific time before an output will occur. Dual Pulse (DP) mode is when any two detections within a specific time will cause an output to occur. SP Mode = 0; CP Mode = Open; DP Mode = 1.\u003Cbr>6511N-092509-1 | PROGRAMMABLE RETRIGGERABLE ONE-SHOTS\u003Cbr>Positive and negative input signals at the digital filter outputs will generate retriggerable one-shot pulses. In the Concurrent Pulse Mode, outputs from each one-shot must occur together at some point in time to cause an output to occur. The one-shot pulse width is programmable using an external RC network. Typical pulse widths used vary between 1 and 12 seconds.\u003Cbr>WINDOW TIMER\u003Cbr>In the Dual Pulse Mode any two detections must occur within a timing window to cause an output to occur . The timing window is programmable using an external RC network. Typical windows are between 1 and 5 seconds.\u003Cbr>ENABLE Input\u003Cbr>A low on the Enable input for LS6513 allows the LED / Relay and LED / Relay outputs to respond to the PIR input detection. If the Enable input is high, then the two outputs remain in their dormant state. The LED / Relay and LED / Relay outputs on LS6511N and LS6512 are always enabled.\u003Cbr>SEL UDV Input\u003Cbr>For the LS6513 , a low on this input allows undervoltage to be detected. If left floating, undervoltage detection will not occur.\u003Cbr>OUTPUT DURATION TIMER\u003Cbr>The duration timer is retriggerable and programmable using an external RC network. Typical ","cbCaicuZnMYkg4zx","https://ap.wps.com/l/cbCaicuZnMYkg4zx","pdf",205027,"English","# Features\n# Applications\n# Overview\n# Differential Amplifier\n# Window Comparator and Digital Filter\n# Mode Select (SP/CP/DP)\n# One-Shots and Timers\n## Window Timer\n## Output Duration Timer\n# Enable and UDV Inputs\n# Outputs and Shunt Regulator\n# Pin Assignment - Top View","[{\"question\":\"What motion-detection pipeline does the LS6511N family use?\",\"answer\":\"It uses a two-stage differential amplifier followed by a window comparator for threshold-based signal selection, then a comparator digital filter that requires motion to persist for a set duration before pulses appear.\"},{\"question\":\"How do SP, CP, and DP modes differ?\",\"answer\":\"In Single Pulse (SP) mode, detection from either positive or negative input produces an output; Concurrent Pulse (CP) requires detection from positive and negative within a specific time; Dual Pulse (DP) triggers when any two detections occur within a defined time window.\"},{\"question\":\"What does the undervoltage detection feature do?\",\"answer\":\"For LS6511N, undervoltage is detected when the supply drops below about 3.5V and is removed when it rises above about 3.7V, helping detect tampering that loads the power supply. LS6512 does not respond to undervoltage detection, while LS6513 can be selected to respond or not.\"}]","LS6511N - PIR Sensor Interface - Programmable Retriggerable One-Shots | PDF",1791810241,13]