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Hi team,
Why add DDSG&DCHG, CFETOFF&DFETOFF pins to the device when DSG and CHG pins are already exist? Is there any difference in what these three FET control pins do?
Thanks!
Hello Kailun,
CFETOFF is a digital input that can turn off the CHG pin's FET.
DFETOFF is a digital input that can turn off the DSG pin's FET. This pin can also be configured to turn off both the CHG and DSG pin's FET.
DDSG & DCHG are digital output pins that indicate if the DSG & CHG pins, respectively, experience a fault.
DSG & CHG are the discharging and charging pins.
Also, CFETOFF, DFETOFF, DDSG, and DCHG can be configured to be general-purpose ADC inputs or thermistor measurement pins instead. Hope this helps!
Best,
David Ray
Hi David
Thank you very much! This helps a lot!
I check the simplified schematic, so I want to double check with you that the DFETOFF & CFETOFF pins are used for MCU to control the CHG & DSG pins? When I used Gauge before, DSG and CHG could be turned on or off directly from Gauge.
Hello Kailun,
Correct, CFETOFF/DFETOFF are meant to be used with an external device, such as an MCU in order to turn-off the CHG or DSG FETs, essentially controlling when they're OFF.
You can read the descriptions of these in Section 6.5 CFETOFF, DFETOFF, and BOTHOFF Pin Functionality of the Technical Reference Manual.
Best Regards,
Luis Hernandez Salomon