VREFHI value for the ADC of TMS320F28377D

Leonardo Callegaro

Expert 1605 points

Other Parts Discussed in Thread: TMS320F28377D, TMS320F2837, CONTROLSUITE, TMDSCNCD28379D

Hi all,

just a very simple question. In the datasheet of TMS320F28377D, I read that the ADC VREFHI can be 2.5V or 3V.

Is VREFHI = 3V for TMS320F28377D?

thank you

Leonardo

over 8 years ago

0 Aditya BG over 8 years ago

Expert 1825 points

Hi,

Is VREFHI = 3V for TMS320F28377D?

Only two options of VREFHI input for TMS320F28377D chip. you can provide either 2.5V or 3.0V as VREFHI

Regards

Aditya

0 Leonardo Callegaro over 8 years ago in reply to Aditya BG

Expert 1605 points

Thanks Aditya. Sorry for my beginner level, but how do I do this? i.e. how do I know if VREFHI=3V?

I am powering F28377D Delfino Experimenter Kit from a 5V power supply and communicating with it via a usb cable to my computer.

Thanks

Leonardo

0 Aditya BG over 8 years ago in reply to Leonardo Callegaro

Expert 1825 points

Hi Leanardo,

Please go through the below infosheet document for those information.

TMDSCNCD28377D-Infosheet_v1_5.pdf

Based on switch settings, VREFHI will be selected.

Regards

Aditya

0 Aditya BG over 8 years ago in reply to Aditya BG

Expert 1825 points

Hi Leanardo,

In experimeter's kit we have option to select 3.0V or 3.3V. For device we can provide VREFHI as 2.5V, 3.0V or VDDA.

Regards
Aditya

0 Brett Larimore over 8 years ago in reply to Aditya BG

TI__Guru 57255 points

Hi Leonardo,

I wanted to clarify that what Aditya is describing is true of the controlCARD evaluation kit.

The TMS320F2837*D chip isn't quite so specific. However, an important thing to know is that there is no internal way to source VREFHI. They must be supplied externally. The image you posted above (from the datasheet) provides the range of voltage reference inputs that can be used.

If you wish to use an evaluation kit as a guide for what might be possible, I'd recommend taking a look at the controlCARD schematics within controlSUITE:
\controlSUITE\development_kits\~controlCARDs\TMDSCNCD28379D_v1_0\R1_3\

Thank you,
Brett

0 Leonardo Callegaro over 8 years ago in reply to Aditya BG

Expert 1605 points

Thanks Aditya, very helpful. OK, since I am using the card TMDXCNCD28377D (and not the chip only) my switch setting is: SW3 and SW4 all to the right and SW2 all up. VREFHI should be 3.3V in this configuration if I have understood correctly. It would be great if you can confirm. Thanks a lot, Leonardo

0 Leonardo Callegaro over 8 years ago in reply to Brett Larimore

Expert 1605 points

Thanks Brett, at the moment I am using the control card. I could not see the folder TMDSCNCD28379D_v1_0 inside the path you have specified... maybe I need to update my control suite? thanks Leonardo

0 Aditya BG over 8 years ago in reply to Leonardo Callegaro

Expert 1825 points

Hi leanardo,

switch setting is: SW3 and SW4 all to the right and SW2 all up. VREFHI should be 3.3V in this configuration if I have understood correctly.

Yes. In this case, VEREFHI will be selected as 3.3V.

Regards

Aditya

0 Leonardo Callegaro over 8 years ago in reply to Aditya BG

Expert 1605 points

Thank you Aditya, appreciate your help.
Leonardo

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VREFHI value for the ADC of TMS320F28377D