Hi Guys,
I’m currently working ona PCB for power control and distribution. The STUSB4500 chip looks ideal for handling the PD side of things. Before getting the board design completed I was hoping to get some hands on with a module using this chip and i came across the following
SKU: DEV-15801
This looks idea however I wanted to see if the following was possible, can the STUSB4500 chip be permenantly reprogrammed via I2C on this board so only higher power modes are accepted? I need only 60W and above and would rather not have 5V attatched to my application at any point.
Cheers, Jordan
No - PDO1 is set to 5v via hardware and cannot be changed Power Delivery Board - USB-C (Qwiic) Hookup Guide - SparkFun Learn
Pg 10 here has more info https://cdn.sparkfun.com/assets/b/6/e/8/9/DS-15801-STUSB4500.pdf
But, basically…going straight to 60w without negotiation is a potentially dangerous situation and it looks like the MFR made sure that wouldn’t be possible :-/
Thanks for that info, i’ve had a bit more of a detailed review of the datasheet and section 3.4.3 VBUS power path assertion seems to indicate that NVM parameters can be set to power only above 5V so the voltage isnt passed to the sink unless that condition is met.
POWER_ONLY_ABOVE_5V set to 1b VBUS_EN_SNK pin enabled only
when source attached and VBUS voltage negotiated to PDO2 or PDO3 voltage. I just wanted to check that this config is compatible with the dev board.
Kind Regards,
Jordan
It should be, based on that info… post back here with your results