LMH6518 SPI interface

Supratim Majumdar

Other Parts Discussed in Thread: LMH6518

Hi,

The SPI interface of LMH6518 has only one line for data (SDIO) while a standard SPI interface has two data lines (MOSI & MISO). How to connect a standard SPI interface with LMH6518?

Regards,

Supratim

over 9 years ago

0 Hooman Hashemi over 9 years ago

TI__Mastermind 22825 points

Hello,

The SDIO pin of the LMH6518 is bi-directional. The Master Input that the LMH6518 drives is tied directly to SDIO, while the Master Output that drives the LMH6518 is tied to SDIO through a Hi-Z buffer, as shown below:

Regards,

Hooman

0 Supratim Majumdar over 9 years ago in reply to Hooman Hashemi

Intellectual 270 points

Hello Hooman,

Thanks for the prompt reply. I was planning just the reverse topology, i.e. SDIO connected directly to data_out of master and through a Hi-Z buffer to data_in of master. I planned this way because I will mainly write to LMH6518 and I will only read back if the o/p of the amplifier is something other than expected. Do you find any problem in this configuration?

Regards,

Supratim

0 Hooman Hashemi over 9 years ago in reply to Supratim Majumdar

TI__Mastermind 22825 points

Hello Supratim,

Your LMH6518 SPI connection method would work just as well. As long as SDIO is connected as either Input or Output (but not both), by tri-stating the unwanted line at the appropriate time, you are OK.

Regards,

Hooman

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LMH6518 SPI interface