When we power on the DM3730 in our design, there is a multi-amp current spike that occurs for 200ms to 400ms. This spike occurs something like 500ms after the SYS_NRESPWRON is released. After the unit is running, if we push our reset button (tied to SYS_NRESPWRON), we get the same multi-amp spike 500ms after the reset is released.
If we reset using SYS_NRESWARM, there is no spike at all.
Even if we use the SYS_NRESWARM for resets, there is still an initial power-on spike. What is causing that, is it a problem? What happens 500ms after the reset is released?
We are using the TPS65950, with the SYS_NRESWARM driving the NRESWARM input of the PMIC.