Device Charging Levels
Power with control
Cambrionix industrial USB hubs auto-detect attached devices and automatically adjust the current output to the highest level permitted by the device manufacturer and USB specifications.
If the charging device supports BC1.2 and charging downstream port (CDP), high current charging during syncing is supported. Our intelligent charging algorithm can be updated to support new devices and charging protocols, ensuring your Cambrionix USB hub keeps up with market changes.
A charger with brains.
Our professional, industrial USB hubs and other products support universal charging profiles, delivering the optimum charge for each device that is connected.
Devices charge at different rates and require different power via different types of USB connection.
Mobile phone and tablets charging methods compare as follows:
Charging from a computer (USB 2.0). If you’re charging from a computer (USB 2.0 port), the maximum current it can provide is 0.5A. This is much slower than charging from the mains.
Charging from a computer (USB 3.0). If you’re charging from a computer (USB 3.0 port), the maximum current it can provide is 0.9A.
Most smartphones come with a 1A charger.
USB Hubs. Supports BC1.2.
iOS devices and many tablets, including the iPad, require a 2A charger. Some smartphones can also use a 2A charger (e.g. Samsung Galaxy Note II).
Most iOS devices.
Power refers to the rate at which energy is added to the battery. It’s calculated by the formula: Power (Watts) = Current (Amps) * Voltage (Volts).
Watts & Amps
5W = 1A 7.5W = 1.5A
10W = 2.1A 12W = 2.4A
Why do Amps matter?
Current is supplied by a power supply or charger. A product (e.g a phone or tablet) consumes current. It will try and take as much current as it needs.
If a product requires 2.1Amps then the power supply should be able to supply 2.1Amps or more. If the power supply can supply more than 2.1Amps this doesn’t matter as the product will only take 2.1Amps. If the power supply can only supply 1Amp then either the product will fail to work/charge or charge slowly as it can’t get enough current (or power) to charge the battery. So here charging will take twice as long.
This means it is important to match voltage between the charger and device. It doesn’t matter if the power supply / charger can provide more current then the device requires. Providing less current will prevent charging or slow it down the same as a poorly designed charger can also prevent charging or slow it down.
BC1.2 Charging Specification
SB-IF Battery Charging Specification revision 1.2 (BC1.2) and the full specification can be found at -http://www.usb.org/developers/devclass_docs
This specification was created to try to unify battery-charging attributes for USB 2.0 in the future. The idea was to minimize the number of cell-phone chargers ending up in landfills, by converging on one USB-charging specification. The European Union has been an early adopter to the notion of less waste. Specifically, they have committed using the same microUSB connectors on data-enabled cell phones, but they have yet to fully adopt the BC1.2 specification.
In the BC 1.2 specification, there is a mode referred to as Charging Downstream Port (CDP) that allows for data and higher charging currents.
If a voltage between 0.4V and 0.8V is sensed on D+ of a host or hub device, then D- should respond with 0.5V to 0.7V.
Once CDP has been established, peripheral devices are allowed to draw up to 1.5A and simultaneously communicate data. Devices with this technology, including cell phones, should be showing up this year.
Certifications and safety standards
Cambrionix products are independently tested for safety and emissions.