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LMP91051: Can the lmp91051 chip switch channels internally?

Tonyx.wu
Genius 4455 points

Part Number: LMP91051

Can the lmp91051 chip switch channels internally? Because two inputs, one input, can't collect two signals of the sensor at the same time. How can I switch the in1 pair of outputs and then switch the in2 pair of outputs? How to set it if you can?

  • 0
    TI__Guru* 91266 points

    Dear Tonyx.wu - 

    For switching between the channels, the input multiplexer (mux) would be utilized. This is controlled by bit 7 of the Device Configuration Register, where IN1 is default (0b) and IN2 would be selected by setting this bit to 1b. The description of such a system starts on page 18 of the datasheet and the sensor used in the example is an IRC-AT dual channel thermopile detector, from Alphasense. This kind of system is also described in this application note https://www.ti.com/lit/an/snaa207/snaa207.pdf, in section 5, which starts on page 4.