I noticed some weird behavior when trying to use PMIC functions get/setInputCurrentLimit. Whenever I tried to set anything over 900, it actually reported a lower value. I am using this code to test: #include "Particle.h" SYSTEM_MODE(MANUAL); PMIC pmic; int currentValues[] = { 100, 150, 500, 900,…

If you don’t mind sending me your code, I’ll run some tests. I’ll ramp up the Supply Voltage when REG08[3] goes high to confirm. I’ve got to go do some paying work today, so it would be this weekend.

Very interesting experiments. A search on TI E2E forum did not turn up something directly related, but they seem to listen and answer questions.

So this all seems directly related to the D+/D- pins and the BQ recognizing everything as a USB host and limiting it to 500mA. I was able to test this morning with a meter inline with the VUSB pin and just the following settings for PMIC: pmic.setChargeVoltage(4208); pmic.setInputVoltageLimit(4520…

@abatardi That’s good info. I think we’re getting close. I’m getting 850 mA without touching the Data Wires. I’m powering the Boron w/ the USB Connector, since that’s how I’ll connect a Solar Panel in the field. But connecting the Data wires and Restarting had no impact on my measurements, when…

Very nice, thank you for doing all that and posting. My application is going to be using the VUSB/GND pins to power the Boron, as we have a secondary PCB that will be used and the boron seated on that via the header pins. Basically something like this: https://store.ncd.io/product/feather-screw-ter…

I just measured the current through the Li-Po wire when using the NCD board you referenced. Using pmic.setInputVoltageLimit(4840); since the NCD board maintains 5V to V(USB) : The Source is 12V input to NCD board. 530 mA into the Li-Po 1030 mA into the Li-Po with USB Data wires connected and re…

FYI, looking at the schematic, there's a diode from the USB connector's power pin to Vin, which is what goes into the PMIC (Vbus pin). The Vusb connector pin is the same as Vin, i.e., it doesn't go through a diode to reach the PMIC (Vbus pin). The schematic doesn't say what kind of diode, but it's n…

@tve - thanks for the info -- correct me if I'm wrong but I don't believe the D+/D- lines actually go to the BQ chip, I think they go to the nRF directly (and are then maybe connected to the bq from there -- not sure)? In terms of setting it after, we've tried changing the settings after a delay, a…

[image] abatardi: I don’t believe the D+/D- lines actually go to the BQ chip They do. Pins 2&3.

This is the response I finally got after weeks from Particle Support: I tested on the Boron as well, and the results were the same as the E series, which is not surprising. I was unable to get an actual charge current of more than 500 mA as measured by the current going into VUSB, regardless of t…

PMIC get/setInputCurrentLimit not setting correctly?

Firmware

Rftop October 29, 2019, 1:07pm 46

@dan.s, This post contains the majority of what I "know" about the issue:

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PMIC get/setInputCurrentLimit not setting correctly?

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