EVAL-ADPD4100Z-PPG Operating Voltage 3.3V ?

Hello,

I want to interface this board with microcontroller that works on 3.3 volts. 
How do I achieve that are there any jumper setting on the board to switch between 1.8 and 3.3 volts ? 
If so, do I need a logic level shifter for spi communication ?

Parents
  • 0
    •  Analog Employees 
    on May 4, 2021 1:15 PM

    Hi there,

    The EVAL-ADPD4100Z-PPG is designed to work with EVAL-ADPDUCZ microcontrol board. The EVAL-ADPDUCZ board provides 1.8V for ADPD4100 part, 3.0V for red/IR LEDs, and 4.2V for green LEDs.

    There is no voltage regulator on the EVAL-ADPD4100Z-PPG board. Hence there is no jumpers for the board to work with 3.3V.

    Regards,

    Glen B.

  • 0
    •  Analog Employees 
    on May 5, 2021 12:02 PM in reply to GlenBu

    1) I'm quite aware that the board is designed to work with EVAL-ADPDUCZ microcontrol board. However, going through the user-guide that comes along with example code for ADPD4100 on github, it is clearly visible that the author is using the SDP-K1 board with some kind of connector workaround on different ADPD sensor board but with same kind of form-factor. I'm trying to achieve the same. 
    adpd-drivers/Load Mbed Example User Guide.pdf at master · analogdevicesinc/adpd-drivers (github.com)


    2) Regarding the voltage regulator part, do you mean that the device uses a 1.8 V for analog core and 1.8 V/3.3 V compatible digital input/output (I/O)? because as per the user guide on page 14, there is a mention about switching between the 1.8 and 3.3 v. Does this imply that the voltage selection is just for the digital input output pins or for all the peripherals? 


Reply
  • 0
    •  Analog Employees 
    on May 5, 2021 12:02 PM in reply to GlenBu

    1) I'm quite aware that the board is designed to work with EVAL-ADPDUCZ microcontrol board. However, going through the user-guide that comes along with example code for ADPD4100 on github, it is clearly visible that the author is using the SDP-K1 board with some kind of connector workaround on different ADPD sensor board but with same kind of form-factor. I'm trying to achieve the same. 
    adpd-drivers/Load Mbed Example User Guide.pdf at master · analogdevicesinc/adpd-drivers (github.com)


    2) Regarding the voltage regulator part, do you mean that the device uses a 1.8 V for analog core and 1.8 V/3.3 V compatible digital input/output (I/O)? because as per the user guide on page 14, there is a mention about switching between the 1.8 and 3.3 v. Does this imply that the voltage selection is just for the digital input output pins or for all the peripherals? 


Children
  • +1
    •  Analog Employees 
    on May 5, 2021 1:02 PM in reply to pmallick

    Hi there,

    For your first question about SDP-K1, you would need to check if the SDP-K1 provides the 1.8V power supply to the ADPD4100 sensor board. If not, you need to add 1.8V either on the SDP-K1 side or on the sensor board. You also need to check if there are appropriate voltages come out the SDP-K1 for LEDs on the sensor board for PPG.

    For your second question, the 1.8V/3.3V jumper is for IOVDD setting. The IOVDD can be 1.8V (low, default) or 3.3V (high). You would need to set bit6 of register 0x00B4 to 0x0 if the IOVDD is 3.3V.

    Please note that all power supplies (1.8V, 3.3V, programmable VBOOST) are from the EVAL-ADPDUCZ and there is no voltage regulators on any of our sensor boards.

    Regards,

    Glen B.

  • 0
    •  Analog Employees 
    on May 6, 2021 3:58 PM in reply to GlenBu

    Thank You, So Much