LM8335EVM: GUI Does not support register addresses larger than 0x1F

Matt Nickels

Part Number: LM8335EVM
Other Parts Discussed in Thread: LM8335

I am using LM8335EVM to drive an off-board RFFE device using the "RFFE Register Access" section of the GUI. I am mostly having success with one exception. The off board device I am controlling has registers at addresses higher than 0x1F, but when I enter an address above 0x1F the GUI automatically changes it to 0x1F.

My understanding of RFFE standard is it supports a full 1 byte address scheme (256 registers) so I don't understand why the LM8335EVM GUI would limit it to 0x1F. Some of these registers I need to get to are well beyond 0x1F; for example 0x40, so I can't even get to that with extended writes and reads.

over 3 years ago

0 Matt Nickels over 3 years ago

Prodigy 40 points

Sorry, my RFFE knowledge is slowly expanding. I think I understand now that I need to use Extended Read/Write to access registers above 0x1F, even if I am only dealing with one address / data byte. I will attempt this and see if it stops limiting my register address to 0x1F.

0 Matt Nickels over 3 years ago

Prodigy 40 points

Ok, so there definitely seems to be a flaw with the GUI. Even when using extended register read, it forces the read to start from a register of 0x1F or lower. Using extended read by RFFE definition should let me start at a register anywhere from 0x00 to 0xFF.

0 Eric Hackett over 3 years ago in reply to Matt Nickels

TI__Guru 74322 points

Matt,

An engineer has been notified of this post and will respond by end of business on 10/18/2022, CST.

Regards,

Eric Hackett

0 BOBBY over 3 years ago in reply to Matt Nickels

TI__Guru* 77271 points

Hi Matt,

Sorry to hear about the issue with the GUI.

The LM8335 was designed to only go up to register address value 0x1F as set in the datasheet in table 1.

-Bobby

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LM8335EVM: GUI Does not support register addresses larger than 0x1F