7
votes
Accepted
USB C PD fast power role swap
The STUSB1600A is only a controller that follows now obsolete management of power roles using pull-up/pull-down combinations on CC lines. It doesn't have any PD capabilities. It is very unlikely that ...
6
votes
Accepted
Always-on socket in-between a 2-way switch?
If you have the neutral then yes. Use a SPDT relay with the common contact on the socket, NO on L2, NC on L1 and control coils connected to L2&N. When L2 is energized, the contact will switch the ...
5
votes
Accepted
Is a PD controller necessary if VBUS is always >5V?
If VBUS is always >5V, this device cannot meet USB specifications. You are sacrificing USB compatibility and endanger users who might accidentally connect a standard USB compliant device (with PD or ...
4
votes
Implementing USB-C PD PHY directly into micro-controller
I've done that with the benefits as you state. This is purely anecdotal, but hey, one data point :)
Most notably: I can buy the MCUs without PD PHY functionality, but the applicable ones (for my use) ...
3
votes
Do devices not tolerating swapping live and neutral exist?
It depends. Always ask the manufacturer. I should guess there are power supplies that are made to expect to be correctly connected inside a fixed equipment with electrical connections made by ...
3
votes
Always-on socket in-between a 2-way switch?
Unfortunately, the answer is no. There is no way for there to be any voltage potential between L1 and L2 without also introducing voltage to your load or otherwise invalidating how the switches ...
3
votes
Need a minimal circuit to obtain 5V from discrete 5V to 20V (5V, 9V 12V, 15V or 20V) input
The simplest way to do it is with a buck-mode switching regulator set for 5 V output. At input voltages of 9V, 12V, 15V or 20V it will step the voltage down to 5 V. At 5 V it will simply pass the ...
3
votes
Creating a USB charger from 2-wire DC
Yuck, Apple charging.
The configuration of resistors on the data lines you need for this is proprietary (a polite way of saying "customer lock-in") Apple and will not only depend on the type ...
3
votes
How do bypass capacitors recharge in high-frequency if the PCB can't deliver high-frequency currents?
Consider a simple LC model of the power network wherein a time dependent current source represents the IC current drawn from the bypass capacitor \$C\$ with \$L\$ being the power plane inductance to ...
3
votes
USB-PD over USB-A
USB Type-A does not have a CC pin so it does not support PD.
Other stanards such as QuickCharge are used over the USB Type-A connector data wires to negotiate higher voltages.
So both your Type-C ...
2
votes
How to connect live and neutral and earth connection in AC devices plugged into socket?
This connection is valid.
As the plug is not polarised, the switch may end up in the live or the neutral wire. This could result in one of the lamp terminals being live, even when the switch is off. ...
2
votes
How do bypass capacitors recharge in high-frequency if the PCB can't deliver high-frequency currents?
Good question.
Once the smaller capacitors have sagged in voltage, because of charge demands, the inductors will build up in current to what is required by the silicon.
This may take many ...
2
votes
Creating a USB charger from 2-wire DC
There is enough information in the various answers and comments to meet your requirements - either for an Apple charger or for another custom of more general charger that needs special arrangements to ...
2
votes
18/4 connector for repeated plugging and unplugging?
I'm rather partial to Anderson's Powerpole connectors, which are highly durable connectors rated for thousands of mating cycles, are modular so you can assemble your own four-pole connector out of ...
2
votes
Accepted
USB-C and >5V Power Supply
By default, you get nothing out of the Vbus pins of a USB-C port until you plug something into it and the port detects that through resistors attached to the CC pin(s).
To get the standard 5V Vbus ...
2
votes
Crossing USB Type-C wires on debug probe
You should cross signals exactly like a USB-C to C cable would. The first cable will cross the signals, but so will the second cable, so if you don't also cross the signals on your passthrough board (...
2
votes
Accepted
FTDI Debugger Load Switching
Each FT devices is different but most feature GPIOs. In case of the FT232R they are called CBUS. Those pin can be accessed using the dedicated D2XX driver and feature a "high drive mode" ...
2
votes
Safety of dual male / single female Y cords
Those Y-cords are used to get 240 volts from two 120 volt outlets. Some of the other answers and comments just say "to get more power than a single outlet would supply" without making this ...
1
vote
How to connect a 24VDC LED light strip and 5V/500mA microcontroller board to power with a single USB-C cable?
You could use a boost converter to raise the 5V to 24V for the LED strip.
But even a better solution would be to use the MCU's PWM signal as a boost driver.
Three conditions need to be met for this: ...
1
vote
Implementing USB-C PD PHY directly into micro-controller
Indeed STM32 series (such as G0/G4/H5/L5) has built-in UCPD peripherals (USB PD controller). You can have a look on the solution at https://www.st.com/content/st_com/en/ecosystems/stm32-usb-c.html. Br
1
vote
I'm having issues with multiple regulator power delivery design
the STM powered by the first 3V regulator is pulling up all of the I2C lines of the peripheral that is powered on a separate 3V bus.
It will power the I2C devices through the ESD protection diodes on ...
1
vote
Crossing USB Type-C wires on debug probe
Your idea is using C receptacles with passives in between. This is not a recommended way of working, because it comes with many pitfalls such as user errors. First, the user is not allowed to mix and ...
1
vote
Accepted
Can USB-C PowerDelivery be restricted to manufacturers devices?
I found a good match (from HP) but looking into reviews on it I read that the full potential of PowerDelivery (100 Watts) is only supported if the receiving device is from the same manufacturer as the ...
1
vote
USB receptables for power delivery?
Your question is a bit vague, but let me try to disentangle it a bit.
If you are consuming power, the nomenclature for that in USB-C is called an "Upstream Facing Port" (UFP). Doing that ...
1
vote
Safe to put USB PD with adaptor on DC IN laptop port?
Safe is defined in 2 ways. Generally and Manufacturer approved.
No it is not safe according to the manufacturer. It's a non standard supply. Warranty could be denied. House catch on fire. Cats and ...
1
vote
18/4 connector for repeated plugging and unplugging?
Neutrik Speak-On connector. Extremely reliable.
These are available in 4-pin and 8-pin.
Pull back on the lock latch and rotate about 1/8 turn counter-clockwise, then pull out.
These are used in ...
1
vote
How to connect live and neutral and earth connection in AC devices plugged into socket?
But why when I have to put a switch in my house I have to take care it is on the live wire and for movable lamps nobody care?
Ahhhhh I understand the reason for your original post now LOL --- ...
1
vote
Accepted
Why do new phones and tablets with a USB Type-C connector use a USB Type-A charger?
Because it is a cheap and effective solution.
Which uses up stocks of chargers that work, while not at top speed but more than sufficient. Most users, or at least a lot, charge overnight so the ...
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