Which type of data bus port to choose

麻袋

Which type of data bus port to choose [Copy link]

Please help me, as shown in the figure below, there is an interface of this type, SDO1 SDO2, if it is connected to a microcontroller (STM32), which interface can be used? If it is SPI, 1 SPI has only one MISO port to receive data. Thank you!

littleshrimp

Using STM32 is a bit difficult. On the one hand, the CNV pin needs a low-jitter signal. How do you plan to provide it with STM32? On the other hand, it is difficult to process 12-bit data. However, if performance is not a consideration, two SPIs can be used to control it. One can be set as the master and the other as the slave. The master SPI sends the clock to the ADC and also provides the clock for the slave SPI. The received data corresponds to two independent channels or both SPIs use the slave mode and use other clock sources.

麻袋

littleshrimp posted on 2018-9-4 22:26 Using stm32 is a bit difficult. On the one hand, the cnv pin needs a low-jitter signal. How do you plan to use STM32 to provide it? On the other hand, the 12-bit data read...

Can't CNV be controlled by the IO port?

littleshrimp

Madai posted on 2018-9-4 22:33 Can't CNV be controlled by IO port?

If you generate CNV signal jitter according to the circuit on page 26 of the data sheet, the problem can be solved. However, it is still difficult to generate the timing in the data sheet with STM32 at a sampling rate of 2MSPS.