BQ40Z50-R1: How to detect if mains power is connected based on BQ40Z50-R1 status

Hi,

Referring to the previously asked question regarding how to detect if a mains power connection exists based on battery controller status,  I'm still having some issues as shown in the Example Result below. I'd appreciate if anyone could offer additional advice.

Problem:

Using the proposed method for detecting mains power does not correctly report expected result as shown in the example provided.

System Overview:

Hardware:
2 battery packs, each configured with an independent BQ40Z50-R1 battery controller

Software:
Polling each controller independently to determine charge status for battery 1 and battery 2.  

Pseudocode: 

def poll_battery_status():
    get_absolute_state_of_charge()
    get_relative_state_of_charge()
    get_remaining_capacity()
    get_full_charge_capacity()
    get_charging_current()
    get_charging_voltage()
    get_is_charging()
    get_mains_power_exists()

def get_mains_power_exists():
    if self.get_is_charging() \
      or (not self.get_is_charging() and self.get_charging_current_mA() == 0 and self.get_charging_voltage_mV() == 0):

        return True

    else:

        return False

Example Result with Mains Power Connected:

Battery 1 Report: 

Mode: 0x6001
Status: 0xE0
Relative state of charge: 91%
Charging: False
Charging Voltage: 16.8 V
Charging Current: 2 A
Mains power connected: False

Battery 2:
Mode: 0x6001
Status: 0xE0
Relative state of charge: 100%
Charging: False
Charging Voltage: 16.8 V
Charging Current: 44 mA
Mains power connected: False

 --- Original Thread ---

Hi Folks,

I am already able to detect if a device is charging, but is there a method to detect a device is connected to external power but not charging?

Some examples:

Battery is 100% charged, and connected to an external power source.

Battery is <100% charged, and connected to external power, but not charging.

Thanks for your suggestions.

From: Andy 
Apr 22, 2020 10:11 PM

You can check the OperationStatus()[XCHG] bit, ChargingCurrent() and ChargingVoltage().

100% RSOC usually occurs when a valid charge termination is detected and then the CHG FET turns off. OperationStatus()[XCHG] will be set to 1, which means charging is disabled. Both ChargingCurrent() and ChargingVoltage() should return 0.

Andy