HI.
Currently, I am using the S32K310, MC33665A, and MC33774 chips to perform voltage acquisition. At present, my MC33665A is operating normally, and the power supply and circuit of MC33774 are also normal. However, when I send a wakeup frame through MC33665A to wake up MC33774, neither of the two AFEs in the bus chain cannot be awakened (this is determined by measuring whether the VDDC voltage can reach 5V). My current wakeup method is to send one frame of the wakeup frame and then delay for at least 10ms before sending another frame of the wakeup frame. What could be the possible reasons for the inability to wake up normally?
Another issue is that after sending the wakeup command, MC33774 did not wake up. However, when I sent a single voltage acquisition instruction, the first MC33774 was awakened, and it responded with the correct voltage value in the DADD=0 state. Is this reasonable?
HI.
I tried this method, but with this enumeration method my AFE1 is enumerated as DADD=2, which means that the messages I send with enumerated AFE1 as DADD=1 are ignored or treated as wakeup frames. The time interval between wakeup frame and enumeration frame is set to 10ms, which should meet the 2.4ms in the manual, is it possible that my wakeup frame is sent in the wrong format?
Hi.
You can try:
Wake up the first 33774 → write DADD to the first 33774 → wake up the second 33774 → write DADD to the second 33774 → wake up the nth 33774 → write DADD to the nth 33774. the flowchart is shown below:
