tag:blogger.com,1999:blog-3747970306027691432.post2638474623635344490..comments2023-03-29T12:51:07.043+02:00Comments on Forty-Two, and now?: MSP430G2 - (USCI) SPI interface 3Franzhttp://www.blogger.com/profile/18441386776102308538noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-3747970306027691432.post-36992240487222854742014-03-07T15:11:18.972+01:002014-03-07T15:11:18.972+01:00Hello, glad you liked the tutorial.
Good question ...Hello, glad you liked the tutorial.<br />Good question : I did not use a resistor as I believe it is used only if you need to READ data from the pot.<br />In that case a weak pull-up resistor could be (just guessing it) something like 4.7K or 10K<br /><br />This is what the Datasheet states :<br /><br />1: The 8-lead Single Potentiometer devices are pin limited so the SDO pin is multiplexed with the SDI pin <br />(SDI/SDO pin). After the Address/Command (first 6-bits) are received, If a valid Read command has been <br />requested, the SDO pin starts driving the requested read data onto the SDI/SDO pin.<br />2: The pin’s “smart” pull-up shuts off while the pin is forced low. This is done to reduce the standby and <br />shutdown current. <br />3: The SDO is an open drain output, which uses the internal “smart” pull-up. The SDI input data rate can be <br />at the maximum SPI frequency. the SDO output data rate will be limited by the “speed” of the pull-up, <br />customers can increase the rate with external pull-up resistorsFranzhttps://www.blogger.com/profile/18441386776102308538noreply@blogger.comtag:blogger.com,1999:blog-3747970306027691432.post-6653464835207770312014-03-06T00:07:14.676+01:002014-03-06T00:07:14.676+01:00Thanks for posting this tutorial. It's been v...Thanks for posting this tutorial. It's been very helpful. I was hoping you could let me know what size resistor you used for the multiplexed SDI/SDO pin set up. The data sheet shows a resistor and I am not sure how to size it. <br /><br />Take care,<br /><br />JonUnknownhttps://www.blogger.com/profile/01252882275902945121noreply@blogger.comtag:blogger.com,1999:blog-3747970306027691432.post-67679111777191953002013-06-03T09:30:45.145+02:002013-06-03T09:30:45.145+02:00Hello, glad you found the article useful.
Had a qu...Hello, glad you found the article useful.<br />Had a quick peak at your blog and it really looks interesting!<br />I will dive into it later more in de tail. Hack on!Franzhttps://www.blogger.com/profile/18441386776102308538noreply@blogger.comtag:blogger.com,1999:blog-3747970306027691432.post-10216596478124894832013-06-03T09:27:30.879+02:002013-06-03T09:27:30.879+02:00I would like to thank you for this very helpful ar...I would like to thank you for this very helpful article! It really made setting up SPI easy on the G2553! I am building an RC car using TI RF modules which use SPI protocol with MCUs. The car itself will have a C2000 Launchpad while the controller will have an MSP430 Launchpad. I am currently testing out wireless comm between these two microcontrollers, and this article has been great help! You can find more info about my project, if you'd like, on www.launchpadtimes.com<br /><br />Thanks!???https://www.blogger.com/profile/17538708466852232592noreply@blogger.com