P9038 DATASHEET
©2016 Integrated Device Technology, Inc. 14 P9038 August 1, 2016
Buzzer Function
An optional buzzer feature is supported on GPIO4 which is
able to drive directly a piezoelectric type transducer without
amplification. As shown on the reference schematic, a series
current limiting resistor should be included if a buzzer device
is included. The buzzer signal is approximately a 2kHz square
wave, and it is recommended to use a buzzer with a 2kHz
resonant frequency for best results.
Buzzer Action: Power Transfer Indication
The P9038 supports audible notification when the device
operation successfully reaches the Power Transfer state. The
duration of the Power Transfer indication sound is
approximately 200ms.
Buzzer Action: Charge Complete Indication
The P9038 supports audible notification when the receiver
sends a "Charge Complete" during the power transfer state. If
"Charge Complete" is sent as the very first packet before
being in the power transfer state, there is no buzzer indication
for this case. The duration of the “Charge Complete” indication
sound is approximately 200ms.
WPC TX-A5 and A11 Coils
The P9038 SW output pins are connected to a
series-resonance circuit comprised of a WPC Type-A5 or A11
coil and a series resonant capacitor, as shown on the
reference design schematic. The coil serves as the primary
winding in a loosely-coupled transformer, the secondary of
which is the coil connected to the power receiver
The power transmitter coil is mounted on a ferrite shield per
the WPC specifications. Either a ground plane or grounded
copper shielding can be added beneath the ferrite shield for a
reduction in radiated electrical field emissions. The coil ground
plane should be connected to the P9038 ground plane by a
single trace.
Resonance Capacitors
The resonance capacitors must be C0G type dielectric and
have a DC rating of at least 50V. The highest-efficiency
combination is four 100nF in parallel to achieve the lowest
ESR.
PCB Layout Considerations
For optimum device performance and lowest output phase
noise, IDT recommends that customers copy the reference
layout used in the P9038-R-EVK reference kit. More
information and layout files can be found at:
http://www.idt.com/P9038-R-EVK.
Additional layout guidelines can be found in application note,
AN-894 P9038 Layout Guidelines. Users are encouraged to
read this document prior to starting a board design.
Thermal Overload Protection
The P9038 integrates thermal overload shutdown circuitry to
prevent damage resulting from excessive thermal stress that
may be encountered under fault conditions. This circuitry will
shut down and reset the P9038 if the die temperature exceeds
140°C. To enable the best performance, it is important to
ensure that the heat generated by the P9038 is dissipated into
the PCB and then carried away into the environment. The
package exposed pad must be soldered to the PCB, with
multiple vias evenly distributed under the exposed pad and
exiting the bottom side of the PCB. This improves heat flow
away from the package and minimizes package thermal
gradients.
Special Notes
56-VFQFPN Package Assembly
Note 1: Unopened Dry Packaged Parts have a one year shelf
life.
Note 2: The HIC indicator card for newly opened Dry
Packaged Parts should be checked. If there is any moisture
content, the parts must be baked for minimum of 8 hours at
125°C within 24 hours of the assembly re-flow process.
