{"id":7857,"date":"2018-06-09T04:00:37","date_gmt":"2018-06-09T03:00:37","guid":{"rendered":"https:\/\/engineernewsnetwork.com\/blog\/?p=7857"},"modified":"2018-06-07T14:36:04","modified_gmt":"2018-06-07T13:36:04","slug":"open-loop-hall-effect-current-transducers-with-digital-outputs","status":"publish","type":"post","link":"https:\/\/www.engineernewsnetwork.com\/blog\/open-loop-hall-effect-current-transducers-with-digital-outputs\/","title":{"rendered":"Open-loop Hall effect current transducers with digital outputs"},"content":{"rendered":"<span class=\"highlight highlight-blue\"><a href=\"https:\/\/engineernewsnetwork.com\/blog\/lem-launches-new-website-to-enable-users-to-search-product-information-more-efficiently\/\" target=\"_blank\" rel=\"noopener\">LEM<\/a><\/span> completes its range of digital output versions of <span class=\"highlight highlight-blue\"><a href=\"http:\/\/www.lem.com\" target=\"_blank\" rel=\"noopener\">HO and HLSR open-loop Hall effect current transducers<\/a><\/span> with analogue to digital (A\/D) conversion performed by an on-board sigma-delta modulator, giving a 1-bit serial bitstream output.<\/p>\n<p>These new components for nominal current measurements of 16, 32, 40, 50, 80, 100, 120, 150, 200, 250 ARMS in 4 different mechanical designs (PCB and panel mounting) provide up to 12-bit resolution with 20kHz bandwidth.<br \/>\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><br \/>\n<ins class=\"adsbygoogle\" style=\"display: block; text-align: center;\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\" data-ad-client=\"ca-pub-7565662001938327\" data-ad-slot=\"7585079586\"><\/ins><br \/>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><br \/>\nThey also supply various possible digital outputs. These include, the single-bit output 2 wires CMOS (with clock in or out modes), RS422 Manchester or LVDS Manchester which minimises the connections required.<\/p>\n<p>Or the 4 wires mode according to the LVDS or RS 422 (Clock in or out) standards. The digital output allows the user to choose the filter used on the bitstream to optimise between resolution and response time, according to the application.<\/p>\n<p>Digital outputs are also intrinsically immune to noise in hostile environments.<\/p>\n<p>For a typical transfer function, the average bitstream density is 50% for zero primary current, and 10% or 90% for maximum currents in negative or positive directions.<br \/>\nWith HLSR-PW models in one mode the clock is output from the sensor at 10MHz and both the clock and the data are single-ended signals with CMOS levels.<\/p>\n<p>Alternatively, the output may be Manchester coded on 2 pins, meeting the RS422 standard.<\/p>\n<p>The footprints of these sensors are the same as the analogue HLSR.<\/p>\n<p>HO-NPW, HO-PW and HO-SW models can have the single-ended and Manchester modes as with the HLSR-PW models but they add 2 extra pins so both the clock and data may be differential signals that meet the RS422 and LVDS standards.<\/p>\n<p>Additionally, the transducer clock may be configured as an input in the range 5\u201312.5MHz to allow a single clock to be used throughout the system.<\/p>\n<p>The new transducers can use a supply voltage of 5V and the operating temperature range is from -40\u00b0C to +105\u00b0C.<\/p>\n<p>Several different filters may be used on a given bitstream. As an example, for a \u201ccurrent control loop\u201d function: if a sinc3 filter is used with an over-sampling ratio (OSR) of 512 the effective resolution of a 150A sensor is 12-bit, and the bandwidth 5kHz.<\/p>\n<p>Alternatively, for an \u201cout of range detection\u201d function, a sinc2 filter with an OSR of 16 would give a response time of 5.2\u00b5s from the same bitstream, but the resolution would be reduced to 6-bits.<\/p>\n<p>Transducers in the HO family have additionally an Over-Current Detect (OCD) feature which measures the current level before the A\/D converter. The response time of the OCD is 2us.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>LEM completes its range of digital output versions of HO and HLSR open-loop Hall effect current transducers with analogue to digital (A\/D) conversion performed by an on-board sigma-delta modulator, giving a 1-bit serial bitstream output. These new components for nominal current measurements of 16, 32, 40, 50, 80, 100, 120, 150, 200, 250 ARMS in &hellip;<\/p>\n","protected":false},"author":1,"featured_media":7858,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[104],"tags":[4446,4445,4138,4447],"class_list":["post-7857","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-electronics","tag-hlsr","tag-ho","tag-lem","tag-open-loop-hall-effect-current-transducers"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Open-loop Hall effect current transducers with digital outputs - Engineer News Network<\/title>\n<meta name=\"description\" content=\"LEM completes its range of digital output versions of HO and HLSR open-loop Hall effect current transducers with analogue to digital (A\/D) conversion\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.engineernewsnetwork.com\/blog\/open-loop-hall-effect-current-transducers-with-digital-outputs\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Open-loop Hall effect current transducers with digital outputs - 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