Then you have no way of charging your MacBook until you buy a new adapter. It will be much cheaper and much less effort to buy a power adapter which will output the voltage you require.Īlso, there is the risk that you somehow break or damage the adapter. Also precise timing will be much easier to achieve.īut for both cases: I do not think it is worth the effort to do this in the first place. In practice: no as a microcontroller will offer much more flexibility than a bunch of logic chips. Since this is an Apple product, it might not strictly adhere to the public standards either. This will be a very complex circuit though and will require some reverse engineering and detailed study of the protocol. In theory: yes, you could make a circuit using standard logic chips to emulate the protocol and "fool" the charger to output more than 5 V. Is there an easy way or workaround to request one of those power profiles without using a microcontroller? They should offer development kits with full examples how to do this.ĮDIT: Other companies as NXP, Maxim, Linear, Cypress, ON Semi, STMicro, might offer controllers with pin straps (with no microcontrollers), but you need to search for this. Unfortunately, the IC will need some control over I2C interface to perform the actual negotiation, so you will need some microprocessor with some software support for PD.
You will have about 5 variants of ICs performing the function of PD controllers, something like TUSB422 or TPS65981. So you need to select "Device UFP" and "Sink". You already have the functional PD source. To start, look at overview of PD solutions at TI, and select proper cluster. Due to horrible protocol complexity, several semiconductor companies offer a set of ICs that embed the PD protocol, a turnkey solution. However, there is a solution at DIY level. Trying to implement the protocol from scratch (as Finbarr seems to suggest) is an obviously losing proposition. It took 3 major revisions and about 5 years of work to come up with current functional standard. The PD specification was designed by a community of more than 300 fine engineers from top semiconductor and software companies. As Finbarr noted, you need to implement Power Delivery communication protocol to negotiate the 20 V output profile.
0 kommentar(er)
