Standard Use - Semtech TSWIRX-LI-EVM User Manual

Standard Use

The TSWIRX-LI-EVM is easy to set up and use. Connect a USB cable from any USB port capable of
driving up to 2 watts (most PCs will suffice) to the USB port on the TSWITX-G2- EVM. On application of
power, its green LED should light, indicating the board is now active.
At this point, the transmitter EVM is ready to transmit power. A few times each second, the transmitter
emits a 'ping' of energy in search of a compliant receiver in range.
When in range, the receiver is powered by the ping sufficiently to be able to announce its presence to the
transmitter, and a transaction begins. The transmitter provides a small amount of power to the newly
discovered receiver, so it can tell the transmitter what its power requirements are.
At the completion of this handshake, the transmitter begins providing the requested power. During power
transfer, the receiver continuously communicates with the transmitter, actively directing the process. In
this way, it is assured that power is only sent when and how it is required by an available and desirous
receiver – and in the way that is compatible with the requirements of the receiver. If required, a receiver
can actively increase or decrease its power request, and the transmitter will act accordingly. As such,
equipment with complex charging requirements can be precisely supported and only the desired amount
of power is provided.
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TSWIRX-5V-EVM 4 of 14
User Guide Rev 1.00