Tool/software:
Dear Sirs and Madams,
When using a combination of TPS25751 and BQ25792, I would like to limit battery charging to 24W. Is this possible to set using the TPS25751?
The auto-negotiation sink register allows you to set the minimum voltage, maximum voltage, and minimum required sink power, but I would like to specify the maximum power.
Regards,
Masashi
Hi Masashi,
Just to clarify, are you looking to the battery charge voltage/current to 24W or TPS25751 to only negotiate up to 24W sink contracts?
The Autonegotiate Sink (reg 0x37) configures the min/max power TPS25751 will negotiate with the connected port partner, assuming TPS25751 is acting as a sink and a PD contract is established. Keep in mind this is the power between the USB-C connector to the PD (TPS25751) called VBUS (see image below for reference). For more details on how to configure Autonegotiate Sink refer to the TRM linked here: https://www.ti.com/lit/ug/slvucr8a/slvucr8a.pdf#page=83
If you're looking to actually modify the charge voltage/current of the physical battery (located at the BQ BAT pin), part of TPS25751 integrated I2C control is to configure BQ25792/8 battery charging voltage and current. These fields are configurable through Q14 and Q15, upon boot-up TPS25751 will configure BQ25792/8 battery charging voltage/current based on the user input settings.
Let us know if you have any further questions or concerns!
Thanks and Regards,
Raymond Lin
