Other Parts Discussed in Thread: TMS320F2800156-Q1
Can you tell me the function of the CAP pin and if I can leave it floating?
The datasheet states to connect a 220nF capacitor between it and ground. The demo board (for the 4 channel version) has a 0.1uF capacitor between it and ground.
But the datasheet says it is a LDO regulated output (1.8V I believe). We are operating / supplying 3.3V to DVDD BUT dont plan to utilize a regulated 1.8V level for anything.
Or is it not an output voltage to be used / connected to external circuitry / loads but just that the capacitor is needed to appropriately create the digital 1.8V level?
Since we are using the SPI communication with SCLK, DIN, DOUT connected to an MCU, CS connected to ground, SYNC/RESET connected to high, my guess is that is enough to necessitate creating the 1.8V level and so we need the capacitor and my guess is we should use the 220nF from the datasheet and not the one on the demoboard.
Also does this mean the SPI communication is conducted at a 1.8V level? (we plan to interface with the TMS320F2800156-Q1 powered by 3.3V). Any considerations that need to be taken to ensure voltage level compatibility?
