Which shall be the voltage for D+ and D for an Android USB charger?

Samsung devices require 1.2V voltage on both D+ and D- data lines, see the schematic below.

Which USB port should I use for charging?

Generally, the more power the USB port provides, the faster the charge. So, if you need to charge your device quickly, choose a charging station with high-speed ports (2.4A or 5A).

What are D+ and D pins?

The D+ and D- transfer data between host and device. They are also used for initial plug-in detection so host knows when to start enumeration with device. Differential just means that both data pins have signal but transmitter drives these with opposite logic levels.

How does USB D+ and D work?

Data is sent over a differential line, which means that D- is a mirror image of D+ , so both Data lines carry the signal. The receiver subtracts D- from D+ . If some noise signal would be picked up by both wires, the subtraction will cancel it. So differential signalling helps suppressing noise.

What are the D+ and D- pins on a USB receptacle?

The D+ and D- pins are the differential pairs used for the USB 2.0 connectivity. There are two D+ pins and two D- pins in the receptacle. However, the pins are connected to each other and there’s actually only one USB 2.0 data differential pair available for use. The redundancy is included only to provide a flippable connector.

What is the best way to handle USB data pins?

There is no ideal way to handle USB data pins to provide compatibility and “fast charge”. There could be many different chargers, and there are many USB devices/phones/tablets that need charging. Historically there were two approaches:

What is the D+/D pin on a Maxim Charger?

Alternatively, Maxim have a range of chips that connect to the D+/D- pin of the charger’s socket to provide the right signal to charge your device, like the MAX14630, which connect to the D+/D- pin sof the socket and provide the right signal to charge your device.

How many devices can be charged from a USB port?

In all cases, pin 1 is 5V (with a little wiggle room, spec allows from 4.75 to 5.25 V, and we aim for the upper end of that range to compensate for voltage drop due to high current draw) and pin 4 is 0V. But, depending on the configuration of the two data pins AND the current draw of your device, a USB output may charge all, some or no devices.