Wakeup and Sleep modes internal interrupt

RE: Wakeup and Sleep modes internal interrupt

Mohamed O.Abouzeid — Tue, 18 Jul 2017 09:22:06 GMT

@endnode , okay thank you, overall it varies between 0.38mA to 0.46mA, I will check the power with the links you said and will let you know, thanks for ur help

RE: Wakeup and Sleep modes internal interrupt

Jørgen Holmefjord — Tue, 18 Jul 2017 09:18:18 GMT

You should be able to achieve much less than 0.4 mA when in system ON idle mode. If you are using the TIMER peripheral to wakeup the chip, this will require the high-frequency clock (HFCLK) to run. HFCLK adds 250-470 uA to the current consumption, depending on the usage. For low power you should use RTC instead, as the RTC runs on the low frequency clock (LFCLK). Also see this answer for more details.

RE: Wakeup and Sleep modes internal interrupt

endnode — Tue, 18 Jul 2017 09:11:23 GMT

400uA is some mean current but do you know exactly what is the power consumption curve over time in different moments and how it relates to radio and other functions being actively used? You can have many SW and HW bugs and debugging procedure is almost always the same: long time step-by-step slowly going from FW running on Dev Kit with power analyzer (to be sure that your FW is doing what it should do), confronting the curves with data sheets (what HW peripheral should take what power) and Errata, then going to your custom HW, doing stripped-down FWs to test each HW peripheral function separately and finally you can find the leaks. There is great guide from Stefan here.

RE: Wakeup and Sleep modes internal interrupt

Mohamed O.Abouzeid — Tue, 18 Jul 2017 09:06:38 GMT

@endnode : Okay, that's good, but the current is too much, 0.4mA is a huge current, I tried to reduce the tx power to -30dbm, but it didn't help.still reading the same current.

RE: Wakeup and Sleep modes internal interrupt

endnode — Tue, 18 Jul 2017 08:23:54 GMT

Hello Mohamed,

All the Q&S you read on this topic here on the forum are correct: there are only SLEEP and POWER OFF modes on nRF5x chips. The first one is used basically all the time (see power_manage() function typically called in main function inside infinite loop). Second one means that you basically shut-down the system and next time it is woken up (power power reset or NFC field in case of nRF52 or by GPIO interrupt) it will start like during normal power on reset event. However it is not possible to run any RTC or WATCHDOG or TIMER inside nRF5x during SYSTEM OFF, read more about it in Reference Manual (e.g. in chapter 12.1.5).

Cheers Jan