MSP430FR2476: ADC Veref+ and Veref- and Channel input

jdata123

Part Number: MSP430FR2476
Other Parts Discussed in Thread: MSP-FET

I am planning to use the Veref+ and Veref- ADC inputs In the data sheet, I cannot find a specification on the range of acceptable values of external ADC Channels or Verefs.

Is Veref+ capable of a value of DVCC? What if using the internal ADC Buffer?

Is Veref- capable of a value of DVSS?

If Veref- is set to a value between DVCC and DVSS, and the Channel Input is below the Veref-, can damage occur? Will the ADC result be zero or something unknown?

What is the input range spec for Channel inputs?

The multiplexed pin for Veref+ is also A0 and Veref- is also A2, according to the Datasheet (though there is discrepancy in Table 4-2, Signal Descriptions). When programming a sequence of conversions, the ADC always decrements to A0. If using Veref+ and Veref-, what will be the expected results of A0 and A2 conversions?

over 5 years ago

0 Eason Zhou over 5 years ago

TI__Mastermind 39855 points

Yes, I also can't find the related information. I have consult the related colleage. Please wait for some time.

For the spec of Veref+ and Veref- you can refer to FR5994 spec first.

For the input range for all Analog pins:

For your last question, it depends on your reference. You can also refer to this document:http://www.ti.com/lit/an/slaa890/slaa890.pdf

0 jdata123 over 5 years ago in reply to Eason Zhou

Prodigy 250 points

If that's the best available, then that's what I'll use. Thank you for the response.

Looking down the road, I was trying to find a JTAG Debug Probe. The TI offerings do not offer much that supports the MSP430. The XDS110 and above do not support MSP430 devices. The XDS100 is no longer recommended by TI. When building a board, going beyond a Launch Pad, what to do? Can't find any reference in TI docs. I'll have to dig out my old MSP430-FET-UIF to program an MSP430FR2476. Will it work? Can't go forward with the project until I have the answer.

0 jdata123 over 5 years ago in reply to jdata123

Prodigy 250 points

Thinking a little more about the debug probe, I guess I could use a launch pad and jumper it over to my board . Maybe this is what TI intended. I hope it can support "chaining" of MSP430 devices JTAGs. I will have six on a board and a CC device.

0 Eason Zhou over 5 years ago in reply to jdata123

TI__Mastermind 39855 points

I am back. I think you can refer to FR5994 datasheet, but actually, it is a differential input ADC. Its spec will be a little different(have 1.2V limit), but it will help you to understand ADC on FR2xxx.

For debug probe you can refer to this document:7633.MSP Debugger Guide.pdf

I advice you to use eZ-FET or MSP-FET to program the device.

Eason

0 jdata123 over 5 years ago in reply to Eason Zhou

Prodigy 250 points

Thank you again for the advice. I will go take a look at the docs you referenced and also the debug probes.You have been a big help.

Thank you

0 Eason Zhou over 5 years ago in reply to jdata123

TI__Mastermind 39855 points

It's OK.

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MSP430FR2476: ADC Veref+ and Veref- and Channel input