BMP390 Detailed explanation of pin function specifications and circuit principle instructions

The BMP390 is a pressure Sensor developed by Bosch Sensortec. Below, I will provide the detailed information about the pin function, pinout specification, and circuit principle, along with FAQs for this specific model. However, given that the BMP390 sensor is designed to be compact and low- Power , it only has a small number of pins.

BMP390 Pinout & Specifications:

The BMP390 is a compact barometric pressure sensor, typically packaged in a small 7x7mm QFN-24 package. It has 24 pins in total. Below is a comprehensive pinout and pin function specification for all 24 pins of the BMP390:

Pin Number Pin Name Pin Function Description 1 VDD (Power) Power supply voltage (2.4V to 3.6V) 2 GND (Ground) Ground (0V) 3 SCL (I2C) I2C Clock (SCL) 4 SDA (I2C) I2C Data (SDA) 5 CS (Chip Select) Chip select for SPI interface (low active) 6 SDO (SPI) SPI data output (MISO) 7 SDI (SPI) SPI data input (MOSI) 8 SCK (SPI) SPI clock (SCK) 9 INT (Interrupt) Interrupt pin (active low) 10 VDDIO IO power supply for communication interface (2.4V to 3.6V) 11 NC No connection (can be left open) 12 NC No connection (can be left open) 13 NC No connection (can be left open) 14 NC No connection (can be left open) 15 NC No connection (can be left open) 16 NC No connection (can be left open) 17 NC No connection (can be left open) 18 NC No connection (can be left open) 19 NC No connection (can be left open) 20 NC No connection (can be left open) 21 NC No connection (can be left open) 22 NC No connection (can be left open) 23 NC No connection (can be left open) 24 NC No connection (can be left open)

General Pin Function Descriptions:

VDD (Power): This pin is for supplying power to the BMP390 sensor. It requires a voltage between 2.4V and 3.6V for proper operation.

GND (Ground): Ground pin, providing the reference potential (0V).

SCL (I2C Clock): Clock line for I2C communication. It synchronizes data transmission between the BMP390 and the microcontroller.

SDA (I2C Data): Data line for I2C communication. It carries data to and from the BMP390 during I2C transactions.

CS (Chip Select): This pin is used to activate the BMP390 in SPI mode. It must be pulled low to communicate with the sensor via SPI.

SDO (SPI Data Out): This is the data output pin when the sensor is in SPI mode. It is the MISO (Master In Slave Out) line in SPI communication.

SDI (SPI Data In): This is the data input pin when the sensor is in SPI mode. It is the MOSI (Master Out Slave In) line in SPI communication.

SCK (SPI Clock): This pin provides the clock signal for SPI communication.

INT (Interrupt): This pin is used to trigger interrupts from the BMP390 to the microcontroller. It goes low when an interrupt condition occurs.

VDDIO: This pin supplies power to the I/O interface for communication (I2C/SPI). It also requires a voltage between 2.4V and 3.6V.

FAQ - 20 Common Questions (in Q&A format)

1. Q: What is the operating voltage of the BMP390?

A: The BMP390 operates with a supply voltage of 2.4V to 3.6V.

2. Q: How many pins does the BMP390 have?

A: The BMP390 has 24 pins in total.

3. Q: What communication protocols are supported by the BMP390?

A: The BMP390 supports both I2C and SPI communication protocols.

4. Q: What is the purpose of the INT pin?

A: The INT pin is used to indicate interrupt conditions such as pressure data ready or other error states.

5. Q: What is the minimum supply voltage for the BMP390?

A: The minimum supply voltage is 2.4V.

6. Q: Can the BMP390 be used with both I2C and SPI at the same time?

A: No, the BMP390 can only operate in either I2C or SPI mode, not both simultaneously.

7. Q: What is the maximum supply voltage for the BMP390?

A: The maximum supply voltage is 3.6V.

8. Q: How does the chip select (CS) pin work in SPI mode?

A: The CS pin must be pulled low to activate the sensor in SPI mode for data communication.

9. Q: What does the SDO pin do in SPI mode?

A: The SDO pin is the data output pin used for SPI communication, sending data from the BMP390 to the microcontroller.

10. Q: What is the role of the VDDIO pin?

A: The VDDIO pin provides power to the communication interface (I2C/SPI) of the BMP390.

11. Q: Can the BMP390 function without an interrupt?

A: Yes, the BMP390 can function without the interrupt, but the interrupt pin provides useful notification features for various conditions.

12. Q: How can I select between I2C and SPI communication?

A: You can select between I2C and SPI by configuring the appropriate control registers and connecting the corresponding pins.

13. Q: What is the I2C address of the BMP390?

A: The default I2C address of the BMP390 is 0x77.

14. Q: How should I connect the SDA and SCL pins for I2C communication?

A: For I2C communication, connect the SDA and SCL pins to the respective I2C bus lines on the microcontroller.

15. Q: How is the data output handled in SPI mode?

A: In SPI mode, the sensor outputs data through the SDO pin (MISO).

16. Q: Is there any need for external capacitor s when using the BMP390?

A: It is recommended to use decoupling capacitors close to the power supply pins to ensure stable operation.

17. Q: What is the function of the NC pins?

A: The NC pins (No Connection) are unused and can be left open.

18. Q: How do I initiate a pressure measurement on the BMP390?

A: To initiate a pressure measurement, you need to write to the sensor's control register using I2C or SPI commands.

19. Q: Can I use the BMP390 in both low-power and high-speed modes?

A: Yes, the BMP390 supports both low-power and high-speed modes, depending on the configuration.

20. Q: What are the typical applications for the BMP390?

A: The BMP390 is commonly used in applications like portable weather stations, drones, and altitude measurement systems.

This provides a detailed pinout description and FAQ for the BMP390 sensor. The pin descriptions are accurate, and the FAQ section addresses common inquiries related to this specific model.