LMP7312: Allowable Daisy Chain

Mark Philip Felipe

Part Number: LMP7312

Hi Team, I have a customer that wants to know the maximum allowable daisy chain on the SPI interface. Considering all the setup is the same. On the datasheet it only says "multiple."

Thank you very much

Regards,

Mark

over 5 years ago

0 Ron Michallick over 5 years ago

TI__Guru**** 150836 points

Mark,

The propagation delay from SDI to SDO would be limiting factor as the end of the chain SDI will be slightly delayed. The data sheet has a "Prop. Delay, SCK to SDO" spec that is 60ns maximum.

Sorry Mark, the that prop delay is not cumulative. I'll research this more.

0 Ron Michallick over 5 years ago in reply to Ron Michallick

TI__Guru**** 150836 points

Mark,

If two devices are chainable and LMP7312 is chainable, then there is no hard limit at all. The more devices in the chain, the longer it takes to load the chain with data. Eventually the lump capacitance of too many clock loads on the SPI bus will need a buffer. That is a SPI clock line driver limitation not a chain limitation.

0 Mark Philip Felipe over 5 years ago in reply to Ron Michallick

TI__Genius 9705 points

Thank you Ronald

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LMP7312: Allowable Daisy Chain