LMP91200: What about SPI and RTD senspr in this part?

Oleg Kobrin

Part Number: LMP91200

Hello!

Currently the product folder of LMP91200 shows a datasheet with no SPI and RTD connection. The early datasheet (for example https://www.mouser.com/datasheet/2/282/lmp91200-20707.pdf) contains this pins, and part number nor case was not changed, in latest datasheet SPI pins are marked as connected to ground or Vcc, and RTD pins are marked as NC.

Moreover, the reference design for the part shows the use of these pins -

So, what is correct?

over 3 years ago

0 Jalen Tate89 over 3 years ago

TI__Genius 9675 points

Oleg,

Please reference the latest datasheet on the LMP91200 product folder for features of the device.

Jalen

0 Oleg Kobrin over 3 years ago in reply to Jalen Tate89

Expert 1890 points

So, the SPI control and RTD was removed from the part without changing partnumber?

0 Oleg Kobrin over 3 years ago in reply to Oleg Kobrin

Expert 1890 points

And thus the reference design is not functional?

0 Jalen Tate89 over 3 years ago in reply to Oleg Kobrin

TI__Genius 9675 points

Oleg,

From what I can provide for you:

Both functions are still included in the device but were removed from the datasheet.

SPI was removed because it fails at or below 4 C.

RTD was removed because the VOUT switch also fails at or below 4 C.

The MUX itself fails below 4C, meaning it cannot switch between temperature and pH

Basically, the device works over temp only if there is no change in the default configuration. This is why the SPI functionality was removed from the data sheet.

Jalen

0 Oleg Kobrin over 3 years ago in reply to Jalen Tate89

Expert 1890 points

Sorry, what is 4 C?

0 Jalen Tate89 over 3 years ago in reply to Oleg Kobrin

TI__Genius 9675 points

Oleg,

That would be 4°C temperature. Sorry for the confusion.

Jalen

0 Oleg Kobrin over 3 years ago in reply to Jalen Tate89

Expert 1890 points

So, it will work with SPI & RTD at room temp ok?

0 Jalen Tate89 over 3 years ago in reply to Oleg Kobrin

TI__Genius 9675 points

Oleg,

Yes you can expect it to work at room temp.

Jalen

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LMP91200: What about SPI and RTD senspr in this part?