How to connect ADXL362 accelerometer to nRF51 DK

[Francisco Martinez]

Hi,

I want to connect an ADXL362 low-power accelerometer to a nRF51DK via SPI for a BLE application. However, I'm still quite unfamiliar with Nordic Semi's BLE offering so I'm guessing that my best way to start would be modifying one of the examples in the SDK, specifically the SPI_Master example and connect the accelerometer to the SPI pins in the DK.

The accelerometer's datasheet says that the I/O voltage for the device is 1.6 to 2.0 volts but doesn't specify wether pull-up or pull-down resistors are needed and I haven't figured that out yet from the SDK documentation. I see this in the ADXL362 datasheet:

How can I connect both devices so I can read data from the accelerometer's registers using SPI? As I mentioned before, I'm completely new to this platform and also the SPI bus so any help will be very much appreciated.

Thanks in advance.

-Francisco

[Sigurd]

Hi,

The SPI master example is a good starting point. You can use any available GPIO pins on the DK, but the default pins used by the example are:

• SCLK: Pin 1
• MOSI: Pin 2
• MISO: Pin 3
• CS: Pin 4

You don't need any resistors, just connect it as shown in the figure you attached. The I/O voltage for the ADXL362 is actually 1.6 to Vs, where Vs is the operating voltage (from 1.6V to 3.5V).

Edit: You can find some drivers for the very similar ADXL375 here. It should be fairly easy to port the drivers to ADXL362.

[Francisco Martinez]

Thank you very much, Sigurd.