Hello
We have problem with DA14583 chip which working as peripheral in extened sleep mode.
On VBAT3V we put 47uC capacitor to reduce power voltage peak drops when advertising/connecting.
After removing the battery, power voltage on DA14583 drop slowly and after insert battery DA often stuck with about 200uA current on supply.
Set RST pin short to high help and DA booting.
We need wait over 6 seconds between remove and insert the battery to boot DA correctly.
Is there any solution to resolve this problem (without external reset) ?
Regards
Andrzej
Device:
Hi Andrzej Richert,
Most probably what you are experiencing is a battery bounce issue and in that case the device can only be recovered via issuing a reset, regarding this you have two options, you can either place an external supervisor or you can place a 1uF capacitor between RST and VBAT3V.
Thanks MT_dialog
Hi
It seems that issue is low VBAT3V (under about 0.65V) to the DA14583 self reset.
Chip stuck often if VBAT3V fall under about 2.3V but not below about 0.65V and VBAT3V raise to nominal 3V (for example after removing battery when DA is in extended sleep mode, 47uF on VBAT3V - VBAT3V fall slowly, and inserting the battery - nominal 3V on VBAT3V).
I think the problem is low self reset voltage on VBAT3V.
I have not found anywhere information about brown out reset in DA14583.
The 1uF capacitor between RST and VBAT3V completely did not solve the problem but helped little.
With 1uF capacitor it is harder to stuck the chip and the time needed to remove and insert the battery (for the chip to reset) is shorter.
Thanks
Hi Andrzej Richert,
Regarding the Brown out information, the 583 doesn't implement a brown out detection circuitry and therefore will not be able to recover, yes the capacitor will not completely solve the issue but it certainly improve it, for a 100% recovery an extenral supervisor is suggested.
Thanks MT_dialog
Hi,
Do you recommend an external resistor (if so, what value) to the reset circuit with a 1uF capacitor or an internal pulldown only?
Hi Andrzej,
Just the capacitor will do, the reset pin is equiped with an internal 25K pull-down resistor.
Thanks MT_dialog