Woodstock Low Power

[Maximilian Hohmann]

Hello Bernhard,

(03-05-2018 01:12 PM)PANAMATIK Wrote:  Can you measure the current drain in sleep mode? It should be around 100 uA. I have feedback from other LP owners, which report, that the battery is working now for weeks. But leaving the ACT chip drains 4 mA current. It has to be removed or its power lines cut. This was not mentioned in the manual, because I didn't know it.

I will make the measurement one of these days. But I have a feeling that the current in sleep mode is not the problem. I have removed all components from the PCB some time ago. There are really only the traces left. Whenever I turn on the calculator I check the voltage display ("g divide") and it consistently shows something like 2,6V. For many days in a row. But sometimes I find it with the batteries totally discharged, way below 1V. Could that be the buck voltage converter that does not go into standby mode when it is supposed to? Maybe a pullup (or pulldown?) resistor on it's "enable" pin would solve the problem? But I don't know what this would do to your board.

Regards,
Max

NB: I must be the only living person who has yet to discover the secret function :-) (but then in my professional environment I have learnt not to play around with delicate electronics because that might end badly - like flying into a mountain or landing a mile short of the runway at night...)