Other Parts Discussed in Thread: DLPA2005, , DLP160AP
Tool/software:
Hi, I have a system using a DLPC3420, DLP160AP and DLPA2005 set up for option 2 control of the DMD. Unfortunately the boot diagnostics show that the DMD connection fails after PMIC initialisation succeeds.
System Power is at 3V3, and 1V8 and 1V1 rails are stable.
I have done some preliminary probing to ensure that the PMIC is in the correct state (PROJ_ON = 1, RESETZ is high, VBIAS and VOFS are in the intermediary stage, a few volts, VRST is not yet driven negative). However since the DLPC3420 is able to read and write to SPI lines and output to HOST_IRQ I doubt there is any issue with the PMIC.
Probing the DMD footprint yields different results however. I was concerned that there may be an issue with the BGA package forming poor connections as microvias were outside my budget and I had to produce a board with via-in-pad, however, all the pins I have probed seem to show that they are being driven by the controller. Not only do all the non DMD control pins work (SPI/I2c/GPIO), but the LVDS pins on the DMD footprint are being driven and are all hovering around 350mV; although I do not believe that is the correct behaviour.
However, the LS pins on the DMD footprint (Write and Clock) are sinked to ground, and there doesn't seem to be any activity on those pins whatsoever.
