User Guide
Rev 2.0
www.semtech.com
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TSDMTX-19V3-EVM
May-18
Semtech
Standard Use
The TSDMTX-19V3-EVM is easy to set up and use. Use the power supply module and line cord that comes with
the EVM kit to apply power to the EVM via “J2”, the 19V power input jack. Once input power is provided, the
green LED should light for about a half-second and then turn off.
At this point, the 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 receiver is in range (usually 4mm~6mm), the receiver is powered sufficiently during the ping-phase and is
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 receiver can tell the transmitter what its power
requirements are.
At the completion of the handshake, the transmitter begins providing the requested power, indicated by a
blinking green LED. 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 by how much it is required by an available
and desirous receiver – and in the way that is compatible to 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.
Once charging is completed, the LED stops blinking and displays a steady green ‘completed’ state. If at any time
an error is detected, the red LED is lit and transmission is halted. To restart, the receiver must be removed from
the range of the transmitter and put back to the target zone to start a new transaction.
Productized Receiver Test
If you have a product that is Qi compliant, simply place it on the circular target of the black plastic antenna cover.
The transmitter should demonstrate the above actions, and the device receiving power should indicate it is taking
a charge in whatever manner its users guide states. You can also perform foreign object detection (FOD) by
following the steps in the “FOD Testing” section below.
