BMP280 Interfaces

[mesutcan]

Hello everyone, 

I have a question about BMP280, pressure sensor. I want to use both interfaces of the sensor (I2C & SPI).  But I am not sure that the sensor has not synchronise communicate  when I try to use both of them. Because datasheet has 'power on reset should be done in order to switch interface you will use'.And power on reset is only executed when both VDD and VDDIO are established. So,

Can bmp280's communication interface be changed (i.e. SPI-->I2C) unless power-on-reset is not done?

[Yanchao · Accepted solution]

Hi Mesutcan,

Do you mean access BMP280 register with SPI & I2C after BMP280 power on?  It's not allowed. After power on, only SPI or I2C selected, to avoid inadventently decoding SPI traffic to another slave as I2C data.

If two more MCU access BMP280, the communication between MCU is a better solution.

Best regards!

[mesutcan]

hello, 

I have one more question about the I2C communication of the pressure sensor. Why BMP180 datasheet has  pull-up resistor for I2C in applicaiton circuit whereas BMP280 datasheet not? So, we should not use pull-up resistors in I2C comunication? 

Thanks.

[Yanchao]

Hi,

For BMP280 I2C, you also need add pull-up resistors, please check BMP280 reference design .

Best regards.

[rbd]

你好，

请问BMP280支持SEE架构吗？或者是从哪里能找到支持SEE架构的驱动