NXP MWCT1x1x User guide

Brand: NXP

Model: MWCT1x1x

Type: User guide

Freescale Semiconductor

Document Number: WCT1012V30RTDUG

User’s Guide Rev. 0, 09/2015

WCT1012 15W Single Coil TX V3.0 Runtime

Debugging User’s Guide

1 Introduction

Freescale provides the FreeMASTER GUI tool

for WCT1012 Medium Power wireless charging

solution. The GUI based on the FreeMASTER

tool can be used to fine tune the parameters in

running state. For the operations of setting up the

FreeMASTER connection, see the WCT1012

15W Single Coil TX V3.0 Reference Design

System User’s Guide (WCT1012V30SYSUG).

Contents

1 Introduction 1

2 Runtime Tuning and Debugging 2

3 Configuration Structure Reference 14

_______________________________________________________________________

2 Runtime Tuning and Debugging

2.1 NVM parameters

This chapter describes the configuration and tuning of the Wireless Charging Transmitter (WCT) library.

The main configuration structure of the library is initially stored in the Flash memory and it is copied from

there to the NvmParams structure in RAM. The initialization data for the Flash-memory structure are

stored in the EEdata_FlashDefaults.asm file.

The WCT GUI based on the FreeMASTER tool can be used to fine tune the parameters at runtime. The

same GUI may also be used to generate the assembler initialization data for the Flash-based configuration.

Alternatively, the WCT GUI may also be used to trigger the application to back up the actual RAM

content of the data structure to Flash.

The WCT GUI is prepared for the following application:

• 15W_MP/example/wct1012.pmp

Section 3 “Configuration Structure Reference” provides detailed information about each configuration

parameter. The same reference information is also available directly in the GUI tool where the parameters

can be changed at runtime.

2.1.1 Runtime access to NVM parameters

As outlined in the previous sections, the WCT GUI based on FreeMASTER tool can be used to read and

modify the parameters at runtime. Parameters are modified immediately, so any change in the operation of

the Wireless Charging system can be evaluated instantly.

The GUI also enables to restore all the configuration parameters to their default values or synchronize the

configuration in GUI with board values by pressing a single button.

The parameters are split to several tabs in the GUI view:

• System parameters

• Coil Parameters

• Calibration

To make the fine-tuned configuration values permanent and default for the next application build, the

whole structure can be exported into assembler syntax of initialization data block. The generated data can

be put to the EEdata_FlashDefaults.asm file directly and used as a new default configuration set.

In addition to actual configuration values, the GUI also calculates proper checksum values to make the

data block valid for the Wireless Charging library.

The exported initialization data block is available on the NVM Raw tab in the GUI.

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Figure 1 WCT GUI (1)

Figure 2 WCT GUI (2)

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2.2 Tuning and debugging

The library is used together with the FreeMASTER visualization tool to calibrate input values and to

observe behavior of the Wireless Charging transmitter. The FreeMASTER tool connects to the target

board by using the UART or JTAG, communication interface.

2.2.1 Data visualization

The FreeMASTER tool enables visualization of any variables or registers in the application running on the

target system. This feature is particularly useful with Wireless Charging application to observe voltage

and currents in real time by using a graphical representation.

The FreeMASTER project file which comes in the Library package contains pre-configured scope views

with the most frequently used runtime parameters. The graphs and views can be easily extended by more

parameters or user-defined data.

Figure 3 Data visualization

2.2.2 Debugging console

In addition to FreeMASTER visualization, the WCT library provides an option to continuously dump selected

debugging information to the user console over the UART interface. The debug messages are sent to UART

any time an important event occurs, if the appropriate message type is enabled.

Be aware that the console UART port must be different from the UART port used by the FreeMASTER

communication. If only one UART port is available, consider the use of an alternative communication

interface for the FreeMASTER connection. Next to UART, the FreeMASTER also supports CAN or JTAG

cable interface.

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There is one UART on WCT1012, so only one of debug console and FreeMaster using SCI can work at a time.

1) If SCI is used for debugging console in MP demo, the settings are as follows:

#define DEBUG_CONSOLE_QSCI0 TRUE // We are using Peripheral QSCI0 for diagnostics

The macro is defined in example->wct1012–> wct_hal_cfg.h.

2) If OSJTAG is used to link Freemaster through SCI, some changes are needed. These macros listed

are defined in example –> wct1012–>hal–> freemaster_cfg.h.

#define FMSTR_USE_SCI 1 /* To select SCI communication interface */

#define FMSTR_USE_JTAG 0 /* 56F8xxx: use JTAG interface */

Note: Only one of macro between DEBUG_CONSOLE_QSCI0 and FMSTR_USE_SCI can be TRUE at

a time.

2.3 Calibration

The library behavior and its parameters should be calibrated before the library can be successfully used.

The calibration procedure consists of four steps, namely, input voltage calibration, input current

calibration, characterization parameters calibration, and normalization parameters calibration. All the

steps require low power disabled, touch disabled, and library running in debug mode except normalization

parameters calibration.

All the calibration steps are used to get accurate power loss for Foreign Object Detection (FOD). Power

loss can be calculated by the following equation. If P_Loss is bigger than threshold, there must be a

foreign object.

P_Loss = T_IN – T_Loss – R_IN

• Input Voltage Calibration and Input Current Calibration are used to get accurate T_IN.

• Characterization Parameters Calibration is used to estimate T_Loss.

• Normalization Parameters Calibration is used to get accurate R_IN.

Figure 4 Calibration

Note: Before starting calibration, read all the values to the NVM data. Click the Read button of Common

for all on the System Params page, Coil Params page, and Calibration page.

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Figure 5 Reading NVM value

2.3.1 Input voltage calibration

The process of input voltage calibration is as follows:

1. Before the calibration, set LOW_POWER_MODE_SUPPORTED to FALSE in the example code.

Then, the MCU runs at full speed even without charging, and the FreeMASTER GUI can respond

quickly when the user performs FOD calibration in debugging mode.

• Before TX is powered on, ensure that the RX is removed and load is disconnected.

• The calibration process of the input voltage requires library to be running in debug mode,

and without RX and load.

• Use the FreeMASTER GUI to do the calibration, and save the constant to flash.

2. When TX is powered on, measure the input voltage of the VINA signal by a multimeter, and write

it to Step 5) in the following window on FreeMASTER GUI.

Figure 6 Input voltage calibration

3. Read out the input Voltage Calibration Constant on the Calibration page of the FreeMASTER

GUI to ensure that it is saved successfully.

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Figure 7 Read voltage calibration constant

2.3.2 Input current calibration

The process of input current calibration is as follows:

1. Power on the wireless charging TX board without load connected.

The calibration process of the input current requires the library to be running in debug mode, and

without RX on.

2. Ensure that RX is removed. Add electronic load or resistors between VINA and Ground to draw

current.

3. Change load current from 50 mA to 1600 mA. Record Actual Current measured by a multimeter.

Use FreeMASTER GUI to do the calibration, and save the constant to flash.

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Figure 8 Input current calibration

4. Read out the Input Current Calibration Constant on the Calibration page of the FreeMASTER

GUI to ensure that it is saved successfully. Before the following FOD calibration, disconnect

FreeMASTER, download new parameters to TX and reset the TX board.

Figure 9 Read input current calibration constant

Connect load after step3

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2.3.3 FOD calibration

The process of FOD calibration is as follows:

1. The calibration process of foreign object detection algorithm requires library running in debug

mode and finished calibration of the Input Voltage and Input Current. The calibration must be

done without RX and load.

• Follow instruction of the Input Voltage Calibration process.

• Follow instruction of the Input Current Calibration process.

Note: There are three control types in the middle power transmitter, half bridge frequency control,

full bridge phase shift control, and full bridge control. Calibration should be done three times for

three working states.

2. For half bridge frequency control, set Control Type to 0. Read coil current and input Power by

setting the coil frequency range from 205 KHz to 115 KHz. On the FreeMASTER GUI, perform

the following steps to get FOD coefficients, CA5, CA6, CA7.

Figure 10 FOD calibration of half bridge frequency control

3. Read out the Power Loss Characterization Parameters on the Calibration page of the

FreeMASTER GUI to ensure that it is saved successfully.

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Figure 11 Read FOD calibration constant of half bridge frequency control

4. For full bridge phase control, set Control Type to 1. Read the coil current and input Power by

setting the working phase range from 26% to 100%. On the FreeMASTER GUI, perform the

following steps to get FOD coefficients, CA5, CA6, CA7.

Figure 12 FOD calibration of full bridge phase control

5. Read out the Power Loss Characterization Parameters on the Calibration page of the

FreeMASTER GUI to ensure that it is saved successfully.

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Figure 13 Read FOD calibration constant of full bridge phase control

6. For full bridge frequency control, set Control Type to 2. Read coil current and input Power by

setting the working phase range from 200 kHz to 125 kHz. On the FreeMASTER GUI, perform the

following steps to get FOD coefficients, CA5, CA6, CA7.

Figure 14 FOD calibration of full bridge frequency control

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7. Read out the Power Loss Characterization Parameters on the Calibration page of the

FreeMASTER GUI to ensure that it is saved successfully.

Figure 15 Reading FOD calibration constant of full bridge frequency control

8. Read out all parameters in the FreeMASTER GUI and use new coefficients in program, reset the

MCU.

2.3.4 FOD normalization

The FOD normalization is to equalize the power loss curve, at which the loss value goes high as the load

increasing, and it may be higher than the threshold even no foreign object is present. To resolve the issue,

Freescale provides the normalization tool through the FreeMASTER GUI to fine-tune the FOD of the

performance customer board.

The process of FOD normalization is as follows:

1. Make sure that the input voltage, input current, and FOD calibration are done.

2. Follow the normalization steps on the FreeMASTER GUI as shown in the following figure. Before

the test, reset the parameter and exit debug mode. Do the test with a standard calibrated Qi 1.1 RX,

like TPR#5. The load range is from 50 mA to 1000 mA.

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Figure 16 FOD normalization

3. After the steps above on the GUI are finished, read out Power Loss Characterization

Parameters on the Calibration page of the FreeMASTER GUI to ensure that it is saved

successfully.

Figure 17 Read FOD normalization constant

Note: FOD normalization in Section 2.3.4 is for low power RX (5W). As for Middle Power RX,

normalization is not necessary, because MP FOD based on power loss method is with online calibration

for accuracy.

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3 Configuration Structure Reference

3.1 System parameters

LED1 Operation ON/OFF Bitfield

Details:

This parameter configures On/Off behavior of LED1 diode:

Bit0 – This parameter, when set, indicates LED1 should be ON in the Initialization state.

Bit1 – This parameter, when set, indicates LED1 should be ON in the STANDBY state.

Bit2 – This parameter, when set, indicates LED1 should be ON in the Power Xfer state.

Bit3 – This parameter, when set, indicates LED1 should be ON in the Device Charged state.

Bit4 – This parameter, when set, indicates LED1 should be ON in the FOD Fault state.

Bit5 – This parameter, when set, indicates LED1 should be ON in the Device Fault state.

Bit6 – This parameter, when set, indicates LED1 should be ON in the System Fault state.

Bit7 – This parameter, when set, indicates LED1 should be ON in the NVM Fault state.

Bit8 – This parameter, when set, indicates LED1 should be ON in the Power Limit state.

Bit9 – This parameter, when set, indicates LED1 should be ON for the LED ON diagnostic cmd.

Bit10 – This parameter, when set, indicates LED1 should be ON for the LED OFF diagnostic cmd.

Default Value:

0x00F1

Member:

NvmParams.SystemParams.LedOperation.LedParams[0].wLedOnOffStateBitfield.all

LED1 Operation Blink Bitfield

Details:

This parameter configures Blinking behavior of LED1 diode:

Bit0 – This parameter, when set, indicates LED1 should Blink in the Initialization state.

Bit1 – This parameter, when set, indicates LED1 should Blink in the STANDBY state.

Bit2 – This parameter, when set, indicates LED1 should Blink in the Power Xfer state.

Bit3 – This parameter, when set, indicates LED1 should Blink in the Device Charged state.

Bit4 – This parameter, when set, indicates LED1 should Blink in the FOD Fault state.

Bit5 – This parameter, when set, indicates LED1 should Blink in the Device Fault state.

Bit6 – This parameter, when set, indicates LED1 should Blink in the System Fault state.

Bit7 – This parameter, when set, indicates LED1 should Blink in the NVM Fault state.

Bit8 – This parameter, when set, indicates LED1 should Blink in the Power Limit state.Bit9 – This parameter, when

set, indicates LED1 should Blink for the LED ON diagnostic cmd.

Bit10 – This parameter, when set, indicates LED1 should Blink for the LED OFF diagnostic cmd.

Default Value: 0xC104

Member:

NvmParams.SystemParams.LedOperation.LedParams[0].wLedBlinkStateBitfield.all

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LED2 Operation ON/OFF Bitfield

Details:

This parameter configures On/Off behavior of LED2 diode:

Bit0 – This parameter, when set, indicates LED2 should be ON in the Initialization state.

Bit1 – This parameter, when set, indicates LED2 should be ON in the STANDBY state.

Bit2 – This parameter, when set, indicates LED2 should be ON in the Power Xfer state.

Bit3 – This parameter, when set, indicates LED2 should be ON in the Device Charged state.

Bit4 – This parameter, when set, indicates LED2 should be ON in the FOD Fault state.

Bit5 – This parameter, when set, indicates LED2 should be ON in the Device Fault state.

Bit6 – This parameter, when set, indicates LED2 should be ON in the System Fault state.

Bit7 – This parameter, when set, indicates LED2 should be ON in the NVM Fault state.

Bit8 – This parameter, when set, indicates LED2 should be ON in the Power Limit state.

Bit9 – This parameter, when set, indicates LED2 should be ON for the LED ON diagnostic cmd.

Bit10 – This parameter, when set, indicates LED2 should be ON for the LED OFF diagnostic cmd.

Default Value:

0x000D

Member:

NvmParams.SystemParams.LedOperation.LedParams[1].wLedOnOffStateBitfield.all

LED2 Operation Blink Bitfield

Details:

This parameter configures Blinking behavior of LED2 diode:

Bit0 – This parameter, when set, indicates LED2 should Blink in the Initialization state.

Bit1 – This parameter, when set, indicates LED2 should Blink in the STANDBY state.

Bit2 – This parameter, when set, indicates LED2 should Blink in the Power Xfer state.

Bit3 – This parameter, when set, indicates LED2 should Blink in the Device Charged state.

Bit4 – This parameter, when set, indicates LED2 should Blink in the FOD Fault state.

Bit5 – This parameter, when set, indicates LED2 should Blink in the Device Fault state.

Bit6 – This parameter, when set, indicates LED2 should Blink in the System Fault state.

Bit7 – This parameter, when set, indicates LED2 should Blink in the NVM Fault state.

Bit8 – This parameter, when set, indicates LED2 should Blink in the Power Limit state.

Bit9 – This parameter, when set, indicates LED2 should Blink for the LED ON diagnostic cmd.

Bit10 – This parameter, when set, indicates LED2 should Blink for the LED OFF diagnostic cmd.

Default Value: 0x0102

Member:

NvmParams.SystemParams.LedOperation.LedParams[1].wLedBlinkStateBitfield.all

Fault Blink Rate (ms)

Details:

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This parameter represents the period of time used to establish a blink rate for any LED in a SYSTEM FAULT or

DEVICE FAULT condition.

Default Value:

200

Min Value:

Max Value:

65535

Member:

NvmParams.SystemParams.LedOperation.wFaultBlinkRateMs

FOD Fault Blink Rate (ms)

Details:

This parameter represents the period of time used to establish a blink rate for any LED in a FOD FAULT condition.

Default Value:

200

Min Value:

Max Value:

65535

Member:

NvmParams.SystemParams.LedOperation.wModFaultBlinkRateMs

Operational State Blink Rate (ms)

Details:

This parameter represents the period of time used to establish a blink rate for any LED when the system is in a

non-fault state.

Default Value: 2000

Min Value:

Max Value:

65535

Member:

NvmParams.SystemParams.LedOperation.wOpStateBlinkRateMs

Delay At Power-Up (ms)

Details:

This parameter can be used to “hold” the state of the LED(s) following initial power-up of the system.

Default Value:

1000

Min Value:

Max Value:

65535

Member:

NvmParams.SystemParams.LedOperation.wDelayAtPowerUpMs

Default PWM Dead Time (ns)

Details:

This parameter defines the default dead time that is used for PWM outputs when configured for use with a standard

FET driver.

Default Value: 0

Min Value:

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Max Value: 65535

Member:

NvmParams.SystemParams.OpStateParams.wPwmDeadTimeNs

TX Max Power Class

Details:

This parameter defines the Power Class that the Transmitter reports to the Receiver, where the value is

used as the exponent in the calculation of the reported power ranges (Typically set to '1' for Medium

Power).

Default Value: 1

Min Value:

Max Value:

65535

Member:

NvmParams.SystemParams.OpStateParams.wTransmitterPowerClass

TX Max power(W)

Details:

This parameter defines the maximum aggregate power available (in Watts) for all channels supported on

the Transmitter. A fraction of this power is delivered to each supported channel, the value of which is

determined following Power Negotiation.

Default Value: 15

Min Value:

Max Value:

65535

Member:

NvmParams.SystemParams.OpStateParams.wTransmitterMaxPower

Transmitter Default Channel Power (W)

Details:

This parameter defines the initial budgetary power (in Watts) reported to each channel in the system. The

sum of the budgetary power reported to each channel shall not exceed the MAX power defined above.

Default Value: 15

Min Value:

Max Value:

65535

Member:

NvmParams.SystemParams.OpStateParams.wTransmitterDefaultChannelPower

ManufacturerCodeMsb

Details:

This parameter defines the Manufacture ID most significant byte.

Default Value: 0

Min Value:

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Max Value: 65535

Member:

NvmParams.SystemParams.OpStateParams.ManufacturerCodeMsb

ManufacturerCodeLsb

Details:

This parameter defines the Manufacture ID least significant byte.

Default Value: 0

Min Value:

Max Value:

65535

Member:

NvmParams.SystemParams.OpStateParams.ManufacturerCodeLsb

Power Xfer Control Bitfield

Details:

Bit0 –Force Rail Control when enabled

Bit12 –Device 1 enable when set.

Default Value:

0x1000

Member:

NvmParams.SystemParams.OpStateParams.PowerControl

WPC Diagnostics Bitfield

Details:

Bit0 – Sends PID status to Console when enabled.

Bit1 – Sends verbose PID info to Console when enabled.

Bit2 – Sends operational status to Console when enabled.

Bit3 – Sends verbose operational status to Console when enabled.

Bit4 – Sends operational state to Console when enabled.

Bit5 – Sends Comm status to Console when enabled.

Bit6 – Sends received packet channel to Console when enabled.

Bit7 – Sends Auto-baud reference count to Console when enabled.

Bit8 – Sends PLD status to Console when enabled.

Bit9 – Sends Analog Ping status to Console when enabled.

Bit14 – This parameter determines whether or not an audible tone is generated when power transfer is stopped.

Bit15 – This parameter determines whether or not an audible tone is generated when power transfer is initiated.

Default Value:

0xC005

Member:

NvmParams.SystemParams.OpStateParams.WpcDiagnostics

WPC Protections Bitfield

Details:

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Bit0 – This parameter, when set, forces the primary to cease power transfer if the reported secondary version is not

greaterBit1 – This parameter, when set, forces a cessation of Power Xfer state when the Rectified Power packet is

not received.

Bit1 - This parameter, when set, forces the primary to cease power transfer if the reported secondary version is not

greater than or equal to the version of the primary device.

Bit2 – This parameter, when set, disables the use of Analog Ping.

Bit3 - This parameter, when set, forces the selection of the FOD bin specified in the following bits.

Bit4-Bit7 -

These bit selections represent the FOD bin specified when the FOD Override bit is TRUE.

Bit8 -

This parameter, when set, forces entry into Power Xfer if the Negotiation fails in an attempt to

continue operation.

Bit 9-

This parameter, when set, forces the use of a 15W power contract when Negotiation fails and the override bit

is set.Default Value:

0x000A

Member:

NvmParams.SystemParams.OpStateParams.WpcProtections

3.2 Operation parameters

Ping Frequency (Hz)

Details:

This parameter defines the coil frequency to be used during Ping operations (device detection).

Default Value:

175000

Min Value:

Max Value:

20000

Member:

NvmParams.OpParams[0].OpStateParams.dwPingFrequency

Ping Pulse Duration (ms)

Details:

This parameter defines the amount of time the Ping frequency should be applied while waiting for device detection.

Default Value:

Min Value:

Max Value:

65535

Member:

NvmParams.OpParams[0].OpStateParams.wPingPulseDurationTimeMs

Ping Interval (ms)

Details:

This parameter defines the amount of time between attempts to Ping the secondary for device detection.

Default Value:

400

Min Value:

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Max Value: 65535

Member:

NvmParams.OpParams[0].OpStateParams.wPingIntervalMs

Frequency (Hz)

Details:

This parameter defines the coil frequency to be used during Analog Ping operations (presence detection).

Default Value:

175000

Min Value:

Max Value:

4294967295

Member:

NvmParams.OpParams[0].OpStateParams.dwAnalogPingFrequency

Min Coil Current (ADC counts)

Details:

This parameter defines the threshold below which an Analog Ping has detected a fault in the resonant tank or coil

drive circuit. If the ADC count is not greater than this value, the unit shuts down with a coil fault.

Default Value:

Min Value:

Max Value:

65535

Member:

NvmParams.OpParams[0].OpStateParams.wAnalogPingMinCoilCurrentThreshold

Coil Current Threshold (% change)

Details:

This parameter defines the threshold above which an Analog Ping may have detected a changed in device presence.

Default Value:

Min Value:

Max Value:

65535

Member:

NvmParams.OpParams[0].OpStateParams.wAnalogPingCoilCurrentThreshold

Duty Cycle (%)

Details:

This parameter defines the duty cycle to be used during Analog Ping operations.

Default Value:

Min Value:

Max Value:

255

Member:

NvmParams.OpParams[0].OpStateParams.byAnalogPingDutyCycle

Pulse Duration (# cycles)

Details:

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