WP3W-RK Reference Kit Manual
© 2016 Integrated Device Technology, Inc
4
May 16, 2016
Usage Guide
These reference boards are designed to demonstrate the performance and functionality of the P9027LP-R and P9235A-R as a fully-functional
wireless power receiver and transmitter pair. This solution is suitable for wearable devices as well as other end products that require up to 3W
output power from the wireless power receiver. In most cases, these boards can be imported into an existing customer system for evaluation
and prototyping. The WP3W-RK evaluation kit is based on the WPC Qi standard protocol but targets ‘paired’ transmitter-receiver solutions –
sometimes called end-to-end customer applications where the receiver is only expected to work with a known transmitter.
Quick-Start Guide
Follow these simple steps to power-up and begin using the P9027LP-R-EVK and P9235A-R-EVK boards:
1.
Power up the P9235A-R-EVK board by connecting the USB cable to either a notebook computer or a USB adaptor with 5V
output (preferred) or a power supply
2.
Verify that the red and green LED flashes once, respectively, – the P9235A-R-EVK board is up and running now
3.
Place the P9027LP-R-EVK board on top of the P9235A-R-EVK board with the coil of the P9027LP-R-EVK facing down and
centered on the coil of the P9235A-R-EVK board. The green LED on the P9027LP-R-EVK board indicates that it has been
successfully powered up.
4.
Optional: Solder two 28-gauge wires to the OUT and GND pins on P9027LP-R-EVK board. Connect these two wires to an
electronic load.
5.
Set the electronic load current to zero initially and then gradually increase the load current up to 400mA with the attached 2W
coils
Output Power
The output of the P9027LP-R-EVK’s LDO regulator has a plated via labeled OUT, and the DC ground return path is labeled GND. The output
provides a nominal 5.0 V with 400mA output current capability using the attached 20mm diameter coil. When switched to the 30mm diameter
coil (supplied in the kit), it can provide up to 600mA output current. The plated vias have a 15 mil diameter, allowing for 28-gauge wire or
smaller.
P9027LP-R Board LED Power Indicator
The P9027LP-R-EVK is equipped with a single green LED power indicator connected from OUT to ACTB. This LED will be illuminated when
the system reaches the desired operating point and enables the DC voltage output. This LED is entirely optional and is included for evaluation
purposes only. When illuminated, it draws less than 1 mA of current from the output. If desired, the brightness of the LED can be increased by
lowering the value of resistor R3.
P9027LP-R Board Test Point Accessibility
The P9027LP-R-EVK reference board was designed so that the core layout could be easily “dropped-in” to an existing system board design.
For this reason, all of the necessary inputs and outputs are placed toward the edge of the board to eliminate uncertainty in escape routing.
For more information about copying the digital layout files, refer to application note
AN-933.
When prototyping with this board, it is important to use a low-resistance wire that is rated for the expected output current. This will avoid
damage to the wire and minimize voltage drops on its way to the load.
