On 30/08/2023 04:40, Jonathan Burchmore
wrote:
I suspect that, as Chris alluded to, Hans has PD7 configured in
push-pull rather than open collector, so it's sinking the
(minimal) current to drop LIN_REG_EN down to 3.3V when the
processor is driving it high.
I'm still confused why we don't see the full supply voltage on
LIN_REG_EN before the processor boots up.
LIN_REG_EN is connected to a MCU pin through a 100K resistor.
It's quite possible the MCU is taking some current even when
inactive, this will lower LIN_REG_EN relative to the supply.? I'm
sure that the spec for the MCU allows this sort of thing, subject
to a maximum current.
Chris, G5CTH
It does appear that LIN_REG_EN, once it is pulled down to 0V after
the SMPS initialization, stays there.
Jonathan KN6LFB
