{"id":49,"date":"2009-03-03T11:18:56","date_gmt":"2009-03-03T00:18:56","guid":{"rendered":"http:\/\/blog.peter-johnson.com.au\/?p=49"},"modified":"2022-03-19T22:42:51","modified_gmt":"2022-03-19T11:42:51","slug":"tomtom-one-v3-connector-pinout","status":"publish","type":"post","link":"https:\/\/blog.peter-johnson.com.au\/index.php\/2009\/03\/03\/tomtom-one-v3-connector-pinout\/","title":{"rendered":"TomTom One V3 connector pinout"},"content":{"rendered":"<p>The TomTom data connector uses a non-standard 2.5mm audio style jack that has four poles on the inside and two around the outer sheath. I have been unable to find a convenient source for the connectors so will remove and replace with a cable to mate with a Digilent PmodRS232 adapter to perform 3.3V TTL to RS232 conversion during debugging. I&#8217;ve done some work with a scope and resistors to determine the pin functions for at least the pins I require. The connector viewed from the top of the PCB looks like this:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-378\" src=\"https:\/\/blog.peter-johnson.com.au\/wp-content\/uploads\/2009\/03\/tomtom1.jpg\" alt=\"\" width=\"137\" height=\"197\" \/><\/p>\n<p>Pin functions were determined as:<\/p>\n<p>1 = RX data in for UART ttySAC0, default rate = 115200, 3.3V TTL.<\/p>\n<p>2 = Power output for accessory, I tested sourcing 100mA will no ill effects on unit.<\/p>\n<p>3 = TX data out for UART ttySAC0, default rate = 115200, 3.3V TTL.<\/p>\n<p>4 = Measured 1.4V output, most probably an audio line output.<\/p>\n<p>5 = When connected to ground via a 1K resistor the unit reports an external line input, so presuably that&#8217;s what it is.<\/p>\n<p>6 = Ground.<\/p>\n<p>7 = Function unknown but when connected to ground via a 10K resistor it caused an immediate shutdown of unit.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The TomTom data connector uses a non-standard 2.5mm audio style jack that has four poles on the inside and two around the outer sheath. I have been unable to find a convenient source for the connectors so will remove and replace with a cable to mate with a Digilent PmodRS232 adapter to perform 3.3V TTL [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,4],"tags":[],"class_list":["post-49","post","type-post","status-publish","format-standard","hentry","category-gps","category-hardware"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>TomTom One V3 connector pinout - Peter Johnson&#039;s Blog<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/blog.peter-johnson.com.au\/index.php\/2009\/03\/03\/tomtom-one-v3-connector-pinout\/\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"TomTom One V3 connector pinout - Peter Johnson&#039;s Blog\" \/>\r\n<meta property=\"og:description\" content=\"The TomTom data connector uses a non-standard 2.5mm audio style jack that has four poles on the inside and two around the outer sheath. 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