1 IntroductionThis document describes the basic steps for getting startedwith the wireless charger receiver reference design Rev1.2.Basic board functions are described in this document.

Freescale provides a low power wireless charger solution(transmitter and receiver) that is compliant with WPC QiV1.0.2 specification.

2 Reference Board FeaturesThe wireless power receiver demo board Rev1.2 includes thefollowing features:

• Compliance with WPC Qi V1.0.2 low power (5 W)standard

• Input power (5~20 Vac peak) from the transmitter viathe Rx coil

• Output power 5 W (5 V at 1 A) capability• Communication with the transmitter with a 2 Kbps bi-

phase signal. Quick dynamic response to load thechange through a control error signal fed back to thetransmitter in real time

• Output disconnection function• System input/output voltage, current and temperature

out-of-range protection

Freescale Semiconductor Document Number:LPWPRUG

User Guide Rev. 0, 11/2012

Low Power Wireless PowerReceiver

© 2012 Freescale Semiconductor, Inc.

Contents

1 Introduction................................................................1

2 Reference Board Features.........................................1

2.1 Reference board block diagram. ....................2

2.2 Modules explanation......................................3

2.3 Boards input and output..................................4

2.4 Software DevelopingEnvironment...................................................5

2.4.1 MCU debugger – P&EMultilink..........................................5

2.4.2 Software developing IDE— CodeWarrior................................6

2.4.3 Software configuration tool– processor expert............................6

2.4.4 Run-time debugging tool –Freemaster.......................................7

2.5 How to Test...................................................8

2.5.1 Test points........................................8

2.5.2 Measurements...............................10

2.6 References...................................................11

• Small PCB size (32 mm x 18 mm x 2 mm). Can be fitted into the back sleeve of mobiles• Optimal power efficiency

B1 – type transmitter and primary coil Receiver and secondary coil

Figure 1. Freescale low power wireless receiver/transmitter in working

2.1 Reference board block diagram

The Rx Rev1.2 design block diagram is shown in Figure 2.

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Figure 2. Reference board block diagram Rev 1.2

2.2 Modules explanation

AC/DC Rectifier andcommunication circuit

FreescaleMC9RS08KB12 MCU

DC-DC converter and outputdisconnection circuit

Figure 3. Board overview

MCU

The Freescale MC9RS08KB12 microcontroller is used to monitor and calibrate system input/output power, control the outputconnection, or disconnection.

The followings MCU modules are used in this application:

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• Modulo Timer (MTIM) for communication and timing control• 10 bits ADC for voltage/current sampling• GPIO for output disconnection on/off

Rectifier

The rectifier uses self-driven sync type. Its characteristics are:• Input voltage — 5 – 20 Vac peak• Output voltage — 5 – 20 Vdc

Communication

Differential bi-phase signal is modulated by switching modulation capacitor.

DC-DC converter• Input voltage — 5~20 Vdc• Output voltage — 5 Vdc/1000mA

2.3 Boards input and output

AC Input—Connect to Rx coil DC Output—Connect to loading+–

Figure 4. Board input and output

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2.4 Software Developing Environment

This chapter demonstrates the software developing environment.

2.4.1 MCU debugger – P&E Multilink

Debugging the target board through the P&E Multilink debugger

Freemaster for run-time debugging

P&E Multilinkdebugger

6 pins to 4 pins convert cable Wireless power receiver target board

Figure 5. SW developing environment

Connector for PE Multilink BDM Debugger

To connect the BDM debugger with the target board, a connector for 6 pins to 4 pins is needed.

Connect the board as Figure 6 indicates.

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Figure 6. 6 pin to 4-pin connector for the BDM debug cable

2.4.2 Software developing IDE — CodeWarrior

For the Freescale MC9RS08KB12 MCU, software (SW) compiling and debugging is in CodeWarrior V6.3.

Figure 7. Freescale MC9RS08KB12 MCU developing IDE – CodeWarrior V6.3

2.4.3 Software configuration tool – processor expert

For MCU resource management and input /output (I/O) driver developping, Freescale provides a Processor Expert GUI toolfor the reference design. The tool is integrated in CodeWarrior and can generate low level I/O drivers and initialization codesautomatically. A customer can change hardware (HW) configurations using this tool.

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Figure 8. SW configuration tool – processor xxpert

2.4.4 Run-time debugging tool – Freemaster

For system run-time debugging and configuration, Freescale provides the Freemaster tool. You can read or write RAM datafor testing, watch the real-time data curve to know system operation status, and record the data curve to a text file with timestamp for debugging.

Figure 9. Run-time debugging tool – Freemaster through P&E Multilink debugger

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Setting -up Freemaster before connecting to the target

Set debugging interface:P&E BDM

Select which P&E BDM debugger connects to the board

Set the binary fileor symbol mapping

Figure 10. Setting Freemaster option

2.5 How to Test

This chapter is about testing.

2.5.1 Test points

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Main test points on the receiver board are shown in the figures below.

AC input MCU 3.3 v Vcc DC output

– +

Communication signalRectifier DC output voltage

Figure 11. Test Points on Wireless Power Receiver Board Rev1.2

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+ –

Output 5 V / 1A MCU Debugging pins — Reset-BKGD-Vcc_GND

Figure 12. Debugging Pins on the back of the Board

2.5.2 Measurements

Here are several examples that show how to measure and debug the board.

Figure 13 shows the input voltage and communication signal from ping phase to a power transfer setup.

Ch1— Rectifier DC output voltage

Ch2 — Coil AC input voltage

Ch3 — Communication signal

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Figure 13. Wireless power receiver ping process

Figure 14 shows the control error signals fed back to the power transmitter when the input voltage changes.

Ch2 —Rectifier DC output voltage

Ch3 —Communication signal

Figure 14. Control error signals response of input voltage change

2.6 References

Get more information from Freescale wireless power charger solution page:

• www.freescale.com/wirelesscharging

RS08KB MCU summary page:• http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=RS08KB

MCU Debugger: USB BDM Multilink• http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=USBMULTILINKBDM&fsrch=1• http://www.pemicro.com/universal/index.cfm

SW Developing IDE: Codewarrior Rev 6.3• http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=CW-MICROCONTROLLERS&tid=CWH

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Document Number: LPWPRUGRev. 0, 11/2012

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