Other Parts Discussed in Thread: TPS25810, TPS65988, TPS25820
Hello - Attached is block diagram for a USB-C power architecture we are looking to solve. Here are the configurations that may exist implementing USB-C power:
Charger connected.
A USB-C charger provides charging power to both a tablet and a speaker amplifier board. Should provide 5V 1A to amplifier board and whatever power is negotiated between the tablet and the wall charger to the tablet. Both tablet and amplifier board have their own battery charging and power path controller circuits.
USB-C device connected
Input device – keyboard, keypad, head-mounted laser pointer, etc. acts as a normal USB input device to tablet. USB-C port must provide USB 2.0 level power (5V, <1A) to device provided by the tablet. Amplifier board must draw no power.
USB-C FLASH connected
Thumb drive acts as a normal thumb drive peripheral to tablet. Power is provided at a 5V non-negotiated source from the tablet to the thumb drive.
Nothing connected
USB-C “hub” normally always connected to tablet and amplifier board. Must draw nothing or some nominal sub-microamp low power mode current. Tablet and amplifier board should be powered from their respected batteries and not try to draw power from the other.
Data is a dedicated pass-through from the tablet to the hub’s downstream port. When flash drives or other HID devices are attached to the hub, the tablet is a USB host. When a charger is attached to the hub, the tablet is a powered device to the charger. Please let me know if there’s a solution you can provide!
