Arduino Nano 33 BLE

Information on the ABX00030 SKU

Somebody may think that information on the Arduino Nano 33 BLE board should be clear and exact. It turns out that this is not exactly so. I will speak about the ABX00030 variant on this page. Here is the datasheet from the Arduino web site:

• https://docs.arduino.cc/static/9a5b2c8dfc3d3049722c35896221dac0/ABX00030-datasheet.pdf

Processor on the board:

• 64 MHz Arm® Cortex-M4F (with FPU)

• 1 MB Flash + 256 KB RAM

This manual gives this picture of the board:

The picture above matches what I ordered and received exactly. The manual is also giving this schematic diagram:

If you will look carefully, you will see that these two boards differ in details. Manual mentions the following elements on the diagram:

ID	Type	Notes
U1	NINA-B306	Main CPU, Bluetooth 5.0 Module
U2	LSM9DS1TR	The 9-axis IMU (Accelerometer, Gyroscope, Magnetometer)
U6	MP2322GQH	Synchronous Step-Down Converter, 1A Load Current
L2	Inductor	3.3 micro henry

Arduino site also contains the following circuit diagram:

• https://content.arduino.cc/assets/NANO33BLE_V2.0_sch.pdf

Below is the same diagram in the form of a picture (with little bit improved readability):

Elements from this circuit diagram:

ID	Type	Notes
U1 A,B	NINA-B3X	Main CPU, Bluetooth 5.0 Module
U2	LSM9DS1	The 9-axis IMU (Accelerometer, Gyroscope, Magnetometer)
U3	MP34DT06JTR	Omnidirectional Digital Microphone
U4 A,B	--	Crypto Auth (it is not clear what is that)
U5	APDS-9960	Proximity, Ambient Light, RGB and Gesture Sensor
LPS-1	LPS22	Pressure Sensor
IC1	MPM3610	Synchronous Step-Down Converter with Integrated Inductor
IC2	HTS221	Humidity and Temperature Sensor

As you can see, several ICs, mentioned on the circuit diagram are not installed on the board plus some of them may not even have pads on the PCB.

Most important takeaways from this diagram:

• Only the U1, U2 and IC1 are installed. Just these 3 ICs. Not any other

• The step down power convertor is MPM3610. I can read "3610" on the chip if looking closely.

• There is no inductor on the boards as it is integrated into the voltage regulator chip

• All LEDs are software driven. None of the LEDs are are driven by the hardware.

These notes are written in January 2023. It may happen that details described above will change.