REFERENCE BOARD MANUAL

5W Qi Wireless Power Transmitter

Reference Board

P9038-R-EVK

Features & Benefits

• WPC 1.1.2 (Qi) compliant for interoperability Compact form

factor for fast prototyping

• Layout module provided for direct copy to system board

• 2-layer PCB reference layout and fully-tested BOM

• 4.5 to 6.9 V input, designed for 5 W output on the receiver

• Integrated power stage for low BOM cost, low

manufacturing cost, and small PCB area

• Input in-rush control prevents surges with inexpensive

power adapters

Evaluation Kit Contents

• One fully-assembled P9038-R-EVK reference board

• USB to Micro USB cable

• Application notes, datasheets, manuals, guides, videos,

layout files, and other digital resources can be found at:

idt.com/P9038-R-EVK

Description

The P9038-R-EVK is a turnkey 5 Watt, Qi-compliant wireless

power transmitter reference kit for fast prototyping and design

integration. The kit consists of an easy-to-use reference board

and comprehensive support collateral that significantly eases

design-in effort and minimizes time-to-market.

An associated layout module enables direct instantiation on to

a system board, while an optimized and fully-tested

Bill-of-Materials (BOM) takes the guess-work out of

component selection. The P9038-based solution is well-suited

for a wide range of applications, including PC peripherals,

furniture, medical devices, and other portable devices still

hindered by traditional contact-based charging bases or

cables.

The board features a ubiquitous micro-USB connector to

supply 5 V power to the input. Alternatively, VIN and GND test

points can be connected to a different power source or wired

directly into a prototype system.

IDT's wireless power transmitter solution is complemented by

the P9025AC-R-EVK Qi-compliant 5 Watt wireless power

receiver reference kit. Visit idt.com/P9025AC-R-EVK

to learn

more.

Figure 1. Reference Board Illustration

5W QI WIRELESS POWER TRANSMITTER REFERENCE BOARD 2 09/23/15

P9038-R-EVK REFERENCE BOARD MANUAL

Usage Guide

This reference board is designed to demonstrate the

performance and functionality of the P9038 as a

fully-functional Qi-compliant wireless power transmitter pad.

In most cases, this board can be wired into an existing system

for evaluation and prototyping.

Quick Start Guide

Follow these simple steps to power-up and begin using the

P9038-R-EVK board:

1. Connect a 5 Volt, 2 Amp micro-USB charger to the

board

Note: lower-power sources can be used, but will limit

the maximum po we r tra ns fe r.

2. Place a Qi-compatible receiver on top of the plastic

coil spacer

3. Verify that the green LED is blinking – coupling has

been established

Input Power Supply

The P9038-R-EVK features a micro-USB input connector as

the primary power source. This connector was selected

because micro-USB adapters are commonly available in most

offices and labs. If preferred, an alternative 5 V power supply

can be wired directly into the VIN and GND test points.

An optional MOSFET (Q6) is connected in series with the

micro-USB connector (J4). While the MOSFET is not required

for operating the P9038 from a USB adapter, it is required for

strict USB compliance, serving to limit inrush current and

provide over-voltage protection for anything over 12 V DC.

IDT recommends using the MOSFET if the board might draw

power from a standard USB port, such as from a USB

connector on a laptop or PC. If the application will not be

controlled not to exceed 12 V DC, then the series MOSFET

can be removed.

EEPROM Configuration

The EEPROM on the P9038-R-EVK board is programmed

with a standard configuration optimized for the reference

layout and coil. This configuration is automatically loaded into

the P9038 device registers when power is applied.

Flexibility to tailor the device behavior to a specific application

can be accomplished by using external resistors to select the

LED mode and FOD offset. Details about the default

configuration and selectable modes and offsets can be found

in the P9038 product datasheet.

Qi Compliance & Certification

The P9038-R-EVK reference board is designed to be

compliant to the WPC 1.1.5 Qi specification, but it is not

Qi-certified. This distinction is important because a Qi-certified

product has completed a strict interoperability testing protocol

in its final form factor. That means, the product containing this

board or using the reference layout and bill-of-materials

should be certified separately.

With that said, the P9038-R-EVK provides all of the necessary

features and flexibility needed to attain Qi-certification. By

using the provided reference design, a system prototype can

be created with minimal changes, and thus, minimal

engineering risk.

To learn more about attaining Qi-certification, visit:

http://www.wirelesspowerconsortium.com/developers/produc

t-testing-and-registration.html

LED Status Indicators

The P9038-R-EVK is equipped with two LED status indicators:

green and red. A red LED indicates various Fault and FOD

("Foreign Object Detection") states. The green LED indicates

Power Transfer and Charge Complete state information. Upon

power up, the two LEDs together may optionally indicate the

Standby State and remain in this state until another of the

defined Operational States occurs.

The P9038 offers several LED control options that are

configurable by the external resistor network on the GPIO3

pin. The stock P9038-R-EVK reference board has a pull down

(R21) to GND, and therefore, is pre-configured to LED Control

Option 1. The status indicators behave as follows:

To learn more about different LED control options, refer to the

P9038 product datasheet. If desired, the brightness of the

LEDs can be increased by lowering the value of resistors R12

and R14.

Green LED Red LED

Standby On On

Transfer Blink 1 Hz Off

Complete One Off

CS100 Blink 0.5 Hz Off

Power Blink 2 Hz Off

Fault Off Blink 4 Hz