BQ40Z50-R2: BQ40Z50-R2

Hi Jonathan,

Jonathan Tshimama-Kabangu said:

1.Hi whilst charging my Pack from RSOC 0% 

I noticed that the LED blinked quicker from 0% to 10%

Do you happen to have the LED PF Code functionality on? This has two different blink rates that might be causing this:

Jonathan Tshimama-Kabangu said:

2Secondly whilst going through the gg file 

it says flash alarm RSOC 10%

For the CHG Flash Alarm and DSG Flash Alarm, they are based on the current being seen at that time:

Regards,

Anthony

Hi Anthony,

Anthony:Do you happen to have the LED PF Code functionality on? This has two different blink rates that might be causing this:

• I have not checked if those conditions are ON from 0-10% but will check and get back to you
• What does the LEDPF=1/LEDPF=0 indicate ?
• how does this table relate to the above questions?

Anthony:For the CHG Flash Alarm and DSG Flash Alarm, they are based on the current being seen at that time

• What does Flash alarm indicate ?
• the only current being seen is the charge current so hows this flash alarm set ?

Regards

Jonathan Kabangu

Hi Jonathan,

Jonathan Tshimama-Kabangu said:

What does the LEDPF=1/LEDPF=0 indicate ?

I believe the LED PF functionality is enabled by the LEDPFON bit seen below. The LEDPF1 and LEDPF0 are configurable settings for it:

Jonathan Tshimama-Kabangu said:

• What does Flash alarm indicate ?
• the only current being seen is the charge current so hows this flash alarm set ?

The flash alarm indicates where the SOC is at based on if a charge current or discharge current is being seen. For example, if the DSG Flash Alarm is set to 5%, and there is a discharge current is being seen, the LED will flash if the SOC is between 5 and 0.

Regards,

Anthony

Hi Anthony,

Anthony:

I believe the LED PF functionality is enabled by the LEDPFON bit seen below. The LEDPF1 and LEDPF0 are configurable settings for it

• And this LEDPF indication is there to designate the failure being seen by the pack?

anthony:The flash alarm indicates where the SOC is at based on if a charge current or discharge current is being seen. For example, if the DSG Flash Alarm is set to 5%, and there is a discharge current is being seen, the LED will flash if the SOC is between 5 and 0.

• This value is set at 10% for our Pack 
• 
• I'm guessing this means when in 0-10% range the pack will flash to indicate "low battery" essentially,i've seen this in practice for our Pack
• For DSG CHG alarm i have not seen this as our pack only blinks when charging ?

Regards

Jonathan Kabangu

Hi Jonathan,

Jonathan Tshimama-Kabangu said:

And this LEDPF indication is there to designate the failure being seen by the pack?

Correct.

Jonathan Tshimama-Kabangu said:

• I'm guessing this means when in 0-10% range the pack will flash to indicate "low battery" essentially,i've seen this in practice for our Pack
• For DSG CHG alarm i have not seen this as our pack only blinks when charging ?

Correct, when the SOC of the gauge is less than 10% and in DSG mode, is this blinking still not being seen?

Regards,

Anthony

Hi Anthony,

Anthony:Correct, when the SOC of the gauge is less than 10% and in DSG mode, is this blinking still not being seen?

• We're only seeing this condition for CHG flash alarm,for our pack we only see this fast blinking for charging when power is connected for charging and RSOC is between 0-10%
• When discharging and pack is between 0-10% nothing blinks ,so i'm not sure why the suppliers have given this value in the gg file if it's not active

Regards

Jonathan Kabangu

Hi Jonathan,

For clarification, is the [LEDCHG] bit set in this application or is the LED being turned on using a high to low transition on the DISP pin? 

Regards,

Anthony

Hi Anthony,

Anthony:

For clarification, is the [LEDCHG] bit set in this application or is the LED being turned on using a high to low transition on the DISP pin? 

• not sure about those bits but essentially our LED only shows when we're charging, we only have one LED!
• LED does not display during discharge or normal operation only when charging!
• Please see schematic for LED
• for LED Flash period ,what does 512us refer to? is this 512 us per min ,second what's the metric here

Regards

Jonathan Kabangu

Hi Jonathan,

The reason I ask about the LEDCHG bit is because if this bit is set, the LED will stay on while the current is greater than the Charge Current Threshold with nothing needed from the DISP pin, which if this bit is set this would make sense why the LED is flashing during the charge and not discharge.

Jonathan Tshimama-Kabangu said:

for LED Flash period ,what does 512us refer to? is this 512 us per min ,second what's the metric here

I believe this metric means that the LED will flash every 512 * 488us.

Regards,

Anthony

Hi Anthony:

Anthony:The reason I ask about the LEDCHG bit is because if this bit is set, the LED will stay on while the current is greater than the Charge Current Threshold with nothing needed from the DISP pin, which if this bit is set this would make sense why the LED is flashing during the charge and not discharge

• i will verify this for you :) 

Anthony:

I believe this metric means that the LED will flash every 512 * 488us.

• so the LED will blink 512 times every 488us?
• if there's 60s in 1 minute then 488/60=8 minutes  so that means the LED is blinking 512 times every 8 minutes approx?
• Here's a video of the fast blinking

Regards

Jonathan Kabangu

Hi Jonathan,

Jonathan Tshimama-Kabangu said:

I believe this metric means that the LED will flash every 512 * 488us.

Sorry for the confusion. I believe the LED will flash every 512 * 488us = 249,856us, or in other terms roughly every 0.25 seconds. The units of the parameter are in 488us, not 1us, so whatever is inputted to this parameter needs to be multiplied by 488.

Regards,

Anthony

Hi Anthony,

I was able to look at the flags for LED ,and it was indeed LEDCHG, meaning it will be ON as long the charge current is greater than charge current threshold 

Regards

Jonathan Kabangu

HI Jonathan,

Thank you for the update. In the current system, is it possible to create a high to low transition on the DISP pin of the device? If this is done while the gauge is discharge mode, this might be able to help see the LED values that are being produced during the discharge.

Regards,

Anthony

Hi Anthony,

Anthony:

Thank you for the update. In the current system, is it possible to create a high to low transition on the DISP pin of the device? If this is done while the gauge is discharge mode, this might be able to help see the LED values that are being produced during the discharge.

• how can i find out this information???,cause currently there's no LED indication during discharge 

Regards

Jonathan Kabangu

Hi Jonathan,

If LEDCHG is enabled, this allows for the gauge to not need a high to low transition on the DISP pin to display the LED status when the gauge is charging, however not for discharging. I believe that this transition on the DISP pin is required when the gauge is discharging.

Regard,s

Anthony

Hi Anthony,

Anthony:

If LEDCHG is enabled, this allows for the gauge to not need a high to low transition on the DISP pin to display the LED status when the gauge is charging, however not for discharging. I believe that this transition on the DISP pin is required when the gauge is discharging.

• Can i change this setting on BQstudio to see LED during discharge ?

Regards

Jonathan Kabangu

Hi Jonathan,

I do not believe this LED can be turned on without the high to low transition on the DISP pin while discharging.

Regards,

Anthony