Hello,
I have an eval board of "nPM1100-EK -> PCA10123 0.8.0" battery of li-po 3.7v 600mah battery termination voltage is 4.2V
The above eval board works fine & the battery is charging fine with ship modes etc. It is all good.
we went ahead & made a custom board Version 2 using npm1100 to evaluate our custom solution which has the nrf52805 module from Raytac
(Our above custom product version 1 has nrf52805 is very well tested uses other battery charge circuits & LDO which is entering production in 2 months)
The custom Version 2 Board which has the npm1100 is working properly in the sense of Buck converter at 3V. but it's not charging the battery. in this scenario, I've connected a high-precision ammeter across the battery +ve terminal. It has an unusual power consumption of 100ma from the battery side when I connect the USB cable. but in a normal circuit operation (without the charging things) consumption of 2-4mA when the entire circuit is operational.
what is working correctly on the Npm1100 side?
-> buck out of 3V is correct & it's corresponding power consumption overall is correct!
-> Entering ship mode & exiting ship mode is correct
-> operation of 3V buck output (without battery connected) from the 5V USB input is working.
What is not working:
-> The battery of 600mAh is not getting charged. at all.
-> unusual power consumption of 100mah from battery when i connect the USB 5V input inorder to charge the battery.(but in my case it's discharging the battery.)
what am I doing wrong here? something I missed?
P.S. The VCHG in the above schematic is the 5V input from USBC connector. for the LED we use the above method for Red led to indicate charging & Green LED to indicate charging complete. this should only work when the USB voltage is present. Blue LED is for application use. ADC measurement is to find the battery level in application usecase.
Let me know Thanks,
Gokunath
