![]() My intention is to put this onto a small additional board. Remember: the above circuit assumes the USB power is supplied by a galvanically isolated supply. Although I won't be using it, I've included the 3.3V regulator (MCP1726) in the upper right corner.Īs I mentioned, for 3.3V only operation, the TPS63061 can be left out, but then the ADuM3160 should be wired slightly differently, as indicated in the datasheet. Here, I've fixed the ADuM3160 for full-speed operation (12Mbit/s), and supply Teensy with 5V using the USB connector. I have checked the suggested/typical use circuits, and the resulting schematic looks suspiciously simple to me. In my case, Teensy will be the only one using 3.3 V, so I'm looking at using a buck-boost DC-DC regulator like Texas Instruments TPS63061 ( datasheet) that can take a DC voltage between 2.5 V and 12 V, and provide a nicely regulated 5V supply and enough current (1.4 A, if the wall-wart supplies enough current) to power the Teensy, USB isolator, and peripherals (like SN75160 and SN75162 GPIB/IEEE-488 transceivers in my case). A 3.3 VDC low drop-out voltage regulator (like Microchip MCP1726 datasheet) can be used for 3.3 V peripherals, ADuM3160 (although slightly different wiring compared to below), and the Teensy itself. To avoid the ground loop via USB ground, an USB isolator chip like Analog Devices ADuM3160 ( datasheet) can be used to galvanically isolate the Teensy from the USB bus. It occurred to me that 5 VDC regulated wall-warts are ubiquitous, and the safe ones are galvanically isolated. I do believe the audio folks encounter this often, too. In my case, the peripherals are 5 VDC (GPIB aka IEEE-488 bus transceivers to interface to oscilloscopes and such). The computer the Teensy is connected to, and the external hardware Teensy interfaces to, are rarely using the same ground potential. If you do not allow these cookies, you will experience reduced relevant content.As you probably know, ground loops (ground potential differences) are a frequent headache when using a Teensy to interface to external hardware. They do not store directly personal information, but are based on uniquely identifying your browser and internet device. They may be used by Analog Devices to build a profile of your interests and show you relevant content on our site. ![]() Targeting Cookies: These cookies may be set through our site by Analog Devices and our service providers. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance. All information these cookies collect is aggregated and therefore anonymous. They help us to know which pages are the most and least popular and see how visitors move around the site. Performance Cookies: These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. If you do not allow these cookies then some or all of these services may not function properly. ![]() They may be set by us or by third party providers whose services we have added to our pages. Functional Cookies: These cookies enable the website to provide enhanced functionality and personalization. These cookies do not store any personally identifiable information. You can set your browser to block or alert you about these cookies, but some parts of the site will not then work. They are usually only set in response to actions made by you which amount to a request for services, such as setting your privacy preferences, logging in or filling in forms. Strictly Necessary Cookies: (Always Active) These cookies are necessary for the website to function and cannot be switched off in our systems. After we finish updating our website, you will be able to set your cookie preferences. Analog Devices is in the process of updating our website. ![]()
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