TMS320DM369: VDD ISIF - 3.3V ISIF?

Gabe Ausfresser

Part Number: TMS320DM369

Hello,

According to the datasheet for the processor on page 45, VDD_ISIF18_33 is a power supply for switchable ISIF (3.3V/1.8V). Then it has the example:

VDD_ISIF_18_33 power supply can be at
1.8V for VPFE pin functionality or it can be at 3.3V if
other peripherals pin functionality is to be used like
SPI3 or GPIO or CLKOUT0, or USBDRVVBUS.

Does this mean that I can't use the VPFE functionality on a 3.3V device? My image sensor bridge IC has 3.3V logic, and if I didn't need a voltage translator for the TMS320DM369 ISIF interface, that would be great. Can someone please verify for me?

Thanks,

Gabe

over 9 years ago

0 Anuj Kumar Gupta over 9 years ago

Genius 4030 points

Hi,

Issue has been forwarded to respective team.
Meanwhile please search for similar e2e queries.

0 sai prasad over 9 years ago

Intellectual 690 points

Hi ,

Please refer to sheet 13 of DM36x EVM schematic. This might give you some idea.

http://support.spectrumdigital.com/boards/evmdm368/revg/files/EVMDM368_revg_Schematics.pdf

0 Gabe Ausfresser over 9 years ago in reply to sai prasad

Intellectual 320 points

Thanks for the response. It looks like the reference design uses a 3.3V supply for ISIF and uses the ISIF interface for video in. Therefore, I will assume that this means that I can use 3.3V ISIF.

Gabe

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TMS320DM369: VDD ISIF - 3.3V ISIF?