P9038-RNDGI datasheet(14/18 Pages) IDT

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P9038 DATASHEET

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.

P9038-RNDGI Datasheet(PDF) 14 Page - Integrated Device Technology

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