is it possible for AD7609 communicate with NI myRIO thru SPI? which are the pins that can be use?
Any datasheet or advice please?
I think myRIO has an SPI lines which can communicate with the AD7609, it just need to configure the AD7609 in serial mode by having the PAR/SER SEL =1. Aside from the usual SPI lines ( CS, SCLK MISO, MOSI), the AD7609 need digital line like the CONVST to initiate a conversion by pulsing it low for a minimum of 25ns. The BUSY pin of the AD7609 will show that the part is converting when this pin goes high and when it goes low it indicate it has already done conversion. Please check the details on the AD7609 datasheet to synchronize the timing of the serial communication. What application you are building with the AD7609?
Hi Jonathan, thanks for your replied. i will use AD7609 to execute two camera at a angle and collect distance data from it. i understand that one of the option is connected by SPI. i just need to understand how SPI works, the logic behind and how is the connection going to be. i have all the datasheet which i have googled few days back.
The timing details of the AD7609 serial interface is shown in the Figure 6 of the datasheet. The AD7609 starts conversion by pulsing the CONVST low. As mentioned, the BUSY will indicate if the conversion is already done. Once done, this means data is ready to be read. When reading data using the serial interface , basically it needs to have the SCLK which clocks out the data on the Dout pins. The Dout A and Dout B pins outputs the serial conversion result of the AD7609. The CS frames the data, so it needs 18 SCLK cycles to frame the conversion result of one analog input channel. These signals must synchronize to have the conversion and read them correctly by the microcontroller or FPGA. Figure 41 is the typical connection diagram but since you will be using the serial interface you need to connect PAR/SER SEL pin to VDrive. Figure 41 is configured using an internal reference and an analog input range of +/-10V.
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