MSP430FR2355 LaunchPad Initial Look and Operational Amplifier Test

RE: MSP430FR2355 LaunchPad Initial Look and Operational Amplifier Test

Fred27 — Fri, 24 Aug 2018 08:08:28 GMT

I've got way to many TI development boards too - including some of the MSP-TS430 series of ZIF socketed boards for those that don't appear as Launchpads.

I've also got a load of STM32 boards that just gather dust, as I decided to make it easier on myself by concentrating on one platform / toolchain. Then there are some Raspberry Pis, some NXP xpresso boards...

I'm currently trying hard to resist the temptation to get into FPGAs.

RE: MSP430FR2355 LaunchPad Initial Look and Operational Amplifier Test

genebren — Thu, 23 Aug 2018 21:38:40 GMT

Very nice blog Frank. I tend to be the same way about development boards, with the exception that the majority of mine are AVR parts. It is very handy to be able to try out code while I am waiting for a PCB to arrive, or to build a quick tool to test out a board under development.

Keep up the good work!

Gene

RE: MSP430FR2355 LaunchPad Initial Look and Operational Amplifier Test

Fred27 — Thu, 23 Aug 2018 12:57:20 GMT

By the way, if you haven't already got a code for free shipping from the TI store (until end of 2018) then PM me. It's the one from the "Free shipping in 2018" banner that sometimes pops up but I found it almost impossible to get the code emailed as it states in the popup.

RE: MSP430FR2355 LaunchPad Initial Look and Operational Amplifier Test

jc2048 — Thu, 23 Aug 2018 10:26:24 GMT

Another good blog. TI ought to be giving you boards rather than making you pay for them.

From the datasheet, they think the accuracy should be within 1%.

But the datasheet also says the typ low output limit (into a 10k load ) is 40mV above ground and might be up 100mV max. How that translates to your essentially no-load situation requires a knowledge of the circuit that you don't have but it is not unusual for an op amp to have difficulties close to the rail and for the specs to go off even if it can actually reach it.

An interesting experiment to try would be to put the device into the follower mode, apply a variable voltage to the input and see how the error changes as you adjust it over the full input range.

RE: MSP430FR2355 LaunchPad Initial Look and Operational Amplifier Test

Fred27 — Thu, 23 Aug 2018 08:42:06 GMT

TI's Launchpads come out so quickly these days it's hard to keep up! Thanks for the informative overview. The Smart Analog Combo peripheral sounds really useful in some scenarios.

I remember evaluating the Extended Scan Interface on TI's MSP430FR6989 many years ago. That was just weird and too niche to be any use.