© 2018 NXP B.V.
WCT101xS Automotive MP-A9 V4.0
Wireless Charging Application
1. Introduction
The Automotive MP-A9_Rev1.0 (MP-A9_Rev1_SCH-
29323_B2, MP-A9_Rev1_LAY-29323_B2) wireless
charging TX demo is used for wireless power transfer
to a charged device. The charged device can be any
electronic device equipped with a dedicated Qi wireless
charging receiver.
NXP Semiconductors Document Number: WCT101XSV10AUG
User's Guide Rev. 0 , 10/2018
Contents
1. Introduction........................................................................ 1 2. Key features ....................................................................... 2 3. Hardware setup .................................................................. 2
3.1. Package content ...................................................... 2 3.2. Board description .................................................... 3 3.3. Powering the board ................................................. 4 3.4. Hardware setup for FreeMASTER and console
communication ..................................................................... 5 4. Application operation ........................................................ 6 5. Hardware description ......................................................... 6
5.1. Input EMI filter ....................................................... 7 5.2. System voltage DCDC and LDO ............................ 8 5.3. Rail voltage generated by digital buck-boost or
analog buck-boost chips ........................................................ 8 5.4. Full-bridge and resonant circuits ............................. 9 5.5. Communication .................................................... 10 5.6. FOD based on power loss ..................................... 10 5.7. FOD based on Q factor change ............................. 12 5.8. Coil selection ........................................................ 14 5.9. Analog sensing ..................................................... 14
6. Application monitoring and control using FreeMASTER 14 6.1. Software setup ...................................................... 14 6.2. Real-time application variables monitoring .......... 17 6.3. Application parameters modification .................... 18
7. Application monitoring through console .......................... 19 7.1. Software setup ...................................................... 19
8. System bring-up ............................................................... 20 8.1. Ping sequences ...................................................... 20 8.2. LED indication ..................................................... 20 8.3. Debug messages.................................................... 21
Hardware setup
WCT101xS Automotive MP-A9 V4.0 Wireless Charging Application, User's Guide, Rev. 0, 10/2018
2 NXP Semiconductors
2. Key features
The key features of the Wireless Charging Transmitter (WCT) are:
• The input voltage ranges from 9 V DC to 16 V DC (automotive battery range).
• The input voltage can drop down to 6 V DC during the start-stop function.
• The nominal delivered power to the receiver is 15 W (at the output of the receiver) and it is
compatible with a 5-W receiver.
• It is designed to meet the Qi 1.2.2 specification.
• The operation frequency is 125 kHz for the Qi devices.
3. Hardware setup
3.1. Package content
The package contains:
• WCT Automotive MP-A9 (WCT - 15WTXAUTOSP):
— Demo board.
— Power supply connector.
— 12-V/3-A power supply.
Hardware setup
WCT101xS Automotive MP-A9 V4.0 Wireless Charging Application, User's Guide, Rev. 0, 10/2018
NXP Semiconductors 3
Figure 1. Hardware package contents
3.2. Board description
The WCT board is connected to the system via the main power connector. It comprises the automotive
battery connection (red wire = +12 V line, black wire = GND line), the CAN connection (yellow wires),
and the IGNITION (blue wire).
The connectors on the bottom edge of the board are:
• JTAG for programming.
• 2x SCI; one for FreeMASTER connection, one for console output. FreeMASTER is used for
debugging and board calibration.
• Temperature sensor connector.
• Touch sense connector.
The board circuitry is covered by a metal shield to lower the EMI and provides a fixed position for the
coils. Figure 2Figure 2 shows the device diagram.
Hardware setup
WCT101xS Automotive MP-A9 V4.0 Wireless Charging Application, User's Guide, Rev. 0, 10/2018
4 NXP Semiconductors
Figure 2. Device diagram
3.3. Powering the board
To power the board up, perform these steps:
1. Plug the 12-V power supply to the socket.
2. Plug the power supply connector to the board.
3. Connect the 12-V power supply to the power supply connector.
Hardware setup
WCT101xS Automotive MP-A9 V4.0 Wireless Charging Application, User's Guide, Rev. 0, 10/2018
NXP Semiconductors 5
Figure 3. Power supply components
3.4. Hardware setup for FreeMASTER and console communication
To set up the hardware for the FreeMASTER and console communication, perform these steps:
1. Find two UART-to-USB adapter boards and install the UART-to-USB device driver onto the PC.
The virtual serial port on the computer must work properly.
2. Plug the USB-UART conversion board to SCI connector J2 according to the SCH signal pin
position. The two UART channels each have a different purpose (FreeMASTER and console).
Figure 4. FreeMASTER and console
Hardware description
WCT101xS Automotive MP-A9 V4.0 Wireless Charging Application, User's Guide, Rev. 0, 10/2018
6 NXP Semiconductors
Figure 5. SCIs and JTAG connectors
4. Application operation
Connect the demo to the 12-V DC supply voltage. The WCT sends periodical power pings to check
whether a device compatible with the Wireless Charging Receiver (WCR) is placed on the charging
surface.
When a Qi-compliant device is placed on the top of the TX coils’ area, the WCT starts the charging
process. If there is no proper Qi answer from the WCR side, the TX does not start the Qi charging
process.
When the WCR answers properly, the power transfer starts. The actual level of the transferred power is
controlled by the WCT in accordance with the WCR requirements. The receiver sends messages to the
WCT through ASK in the coil resonance power signal and the transmitter sends the information to the
receiver through FSK (as per the Qi specification). The power transfer is terminated when the receiver is
removed from the WCT magnetic field.
The system supports all Qi WCR devices (Qi_Ver-1.0 compliance, Qi_Ver-1.1 compliance, and Qi EPP
15-W receiver). The system supports all Foreign Object Detection (FOD) features for different
receivers. For the low-power 5-W receiver, the power loss FOD is supported. For the EPP 15-W
receiver, both the Q-value method and the power loss FOD method are supported.
5. Hardware description
Figure 6 shows the block diagram of the automotive wireless charger MP-A9. Visit www.nxp.com to get
the latest hardware design files. The whole design consists of several blocks which are described in the
following sections.
Hardware description
WCT101xS Automotive MP-A9 V4.0 Wireless Charging Application, User's Guide, Rev. 0, 10/2018
NXP Semiconductors 7
Figure 6. Automotive wireless charger MP-A9 block diagram
5.1. Input EMI filter
The J1 input connector provides the whole car-connection wiring. This connector connects the battery
voltage to the WCT and CAN communication interfaces.
The input filter consists of the common mode filter FL1 and the filter capacitors C1, C3, C4, C14, C617,
C618, and L1.
FB Inverter
Coil Switched
Digital buck-boost
Input Current
Input EMI filter
Can and Lin
NFC NCF3340
WCT101xS
UART&JTAG Q-value detection
Hardware description
WCT101xS Automotive MP-A9 V4.0 Wireless Charging Application, User's Guide, Rev. 0, 10/2018
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The main battery voltage switch is equipped with MOSFET Q1. This stage is controlled by the
WCT101xS main controller and the IGNITION signal. The hardware overvoltage protection (more than
20 V DC) is implemented to this switch by D1 and Q2.
5.2. System voltage DCDC and LDO
The 12-V car battery input is connected to the U25 buck converter (MPQ4558). Its output is 5 V and
supplies the LDO U26 (MPQ8904), the MOSFET driver, and the CAN transceiver. The 3.3-V LDO
output is used mainly for the WCT101xS and other 3.3-V components.
The DCDC works in the light-load conditions. It is preferable to select high efficiency in the light-load
condition.
5.3. Rail voltage generated by digital buck-boost or analog
buck-boost chips
The Qi specification for the MP-A9 topology requires the DC voltage to control the power transferred to
the receiver. The buck-boost converter is selected to obtain the regulated DC voltage ranging from
1 V DC to 24 V DC for the full-bridge inverter power supply. The buck boost can be controlled digitally
by the WCT chip or the individual analog buck-boost converter (the WCT chip controls just the output
voltage feedback).
The digital buck-boost module includes the drivers, the full-bridge converter, and the output-voltage
feedback. The DCDC converter control loop is implemented by the firmware and the control parameters
can be optimized using different main-circuit parameters, such as the inductor and the output capacitor.
Figure 7. Digital buck-boost main circuits
For the analog buck-boost module, LTC3789 is selected to generate the rail voltage. The WCT chip
controls the rail voltage using an analog signal. This analog signal affects the analog buck-boost
converter feedback and the system can get the rail voltage as it expects.
C37110uF
C3110.1uF
50V
VRAIL_2
D84
PMEG060V050EPD
DNP
1 23
GND2
C49647pF
C3680.1uF50V
Ipeak_S2 8
R442
0.015
C449 10uF
C448 10uF
GND2
GND2
GND2
GND2
GND2
GND2
Small board 2
D56
1PS76SB10
A C
D57
1PS76SB10
A C
R400
10.0K
VDriv e_S2
R401
10.0K
C305 0.1uF
C304 0.1uF
R40210
R403 10
DBUCK_PWML_S28
DBUCK_PWMH_S28
R404 10
AUIRS2301S
U30
VCC1
HIN2
LIN3
COM4
LO5
VS6
HO7
VB8
Q51
NVTFS5820NLTAG
14
32
5
Q50
NVTFS5820NLTAG
14
32
5
Q52
NVTFS5820NLTAG
14
32
5
Q53
NVTFS5820NLTAG
14
32
5
R405
10.0K
R406
10.0K
VDriv e_S2
C308 0.1uF
R408 10
C307 0.1uF
R40710
DBOOST_PWML_S28
DBOOST_PWMH_S28
R409 10
L24
10UH
1 2
AUIRS2301S
U31
VCC1
HIN2
LIN3
COM4
LO5
VS6
HO7
VB8
VBAT_SW_2
C36910uF
R4113.32
C3191000pF
C3431000pFC344
1000pF
C3181000pF
R4663.32
R4103.32
R4673.32
Hardware description
WCT101xS Automotive MP-A9 V4.0 Wireless Charging Application, User's Guide, Rev. 0, 10/2018
NXP Semiconductors 9
Figure 8. Analog buck-boost main circuits
It is recommended to use the digital buck boost on the wireless charging solution due to its lower cost,
simpler hardware circuits, and easier control.
5.4. Full-bridge and resonant circuits
The full-bridge power stage consists of two MOSFET drivers (U8 and U9) and four power MOSFETs
(Q13, Q15, Q19, and Q20). The MOSFET drivers are powered by a stable 5-V DC voltage that
decreases the power losses in drivers and MOSFETs. The full-bridge power stage converts the variable
DC voltage (VRAIL) to the square-wave, 50-%, duty-cycle voltage with a 125-kHz frequency. The
range of the frequency (from 120 kHz to 130 kHz) is defined in the Qi specification for the MP-A9
topology.
The resonant circuits consist of C111, C112, C423, C580, and the coils, all of which have fixed values
defined in the Qi specification for the MP-A9 topology. The snubber RC pairs connected in parallel to
the power MOSFETs are used to lower the high frequency of the EMI products. The VRAIL discharge
circuits Q46 and R376 are switched on while the system is terminated.
C524 0.01uF
GND6
R6641K
R6651K
R666 68K
C525 1000pF
C526 3300pF
R6670
R6680 DNP
R669
120K
R671 0
R672 0DNPC52710uF
R676 0.015
GND6
GND6
C529 0.22uF
INTVCC9
C530 4.7uF
GND6
C531 0.22uF
GND6
VBAT_SW_6R6790
GND6
INTVCC 9
INTVCC 9
GND6
R646 2.00k
R687 2.00k
LTC3789IGN
U75
VFB1
SS2
SE
NS
E+
3
SE
NS
E-
4
ITH5
SGND6
MODE/PLLIN7
FREQ8
RUN9
VINSNS10
VOUTSNS11
ILIM12
IOSENSE+13
IOSENSE-14
TRIM15
SW216
TG217
BOOST218
BG219
EXTVCC20
INT
VC
C21
VIN22
BG123
PG
ND
24
BOOST125
TG126
SW127
PGOOD28
GND6
R6570
DCDC_PG_69
GND6
R6700VRAIL_6
R625
1.6K
C50210uF
GND6
C50310uF
GND6
C50410uF
GND6
R680 0VBAT_SW_6
C51347pF
VRAIL_6
TP64
DNP
Differential Wire
Small board 6
DCDC_EN_6 9
GND6
R634 10
R635 10
D90 1PS76SB10A C
R637 10
R636 10
R639 0
R638 0
D91
1PS76SB10
AC
R641 0
R640 0
R642 0
R643
0
C515
0.1uF50V
R6450
D85
PMEG2005AEA
AC
D86
PMEG2005AEA
AC
D87
PMEG2005AEA
AC
D88
PMEG2005AEA
AC
C5180.1uF50V
R651
0.015
R652
10.0K
R653
10.0K
Q76
NVTFS5820NLTAG
14
32
5
Q77
NVTFS5820NLTAG
14
32
5
R654
10.0K
Q78
NVTFS5820NLTAG
14
32
5
R655
10.0K
Q79
NVTFS5820NLTAG
14
32
5
L3210UH
1 2
VBAT_SW_6
C5210.1uF
50V
VRAIL_6
INTVCC9
R662200
C5234700pF
RAIL_CNTL_6 9
INTVCC 9
R66339K
R661 4.3K
GND6
R629 100DNP
R628 100DNP
VRAILB_S6
C514 1.0uF
IS-_S6 9
R677
100
R678
100
C5172700pF
C5202700pF
C5192700pF
C5162700pF
R6483.32
R6473.32
R6503.32
R6493.32
Hardware description
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Figure 9. Full-bridge circuits and coil-selection circuits
5.5. Communication
There is a two-way communication between the medium power transceiver and the receiver.
The communication from RX to TX is as follows: The receiver measures the received power and sends
the information about the required power level back to the transmitter. This message is
Amplitude-Modulated (AM) to the coil current and sensed by the TX.
The RC circuits (C210, R116, R118, and R224), known as DDM, sample the signals from the coil,
compress the signal amplitude, and feed to the ADC 0, channel 0 of the WCT101xS. The information
about the current amplitude and modulated data are processed by the embedded software routine.
The communication from TX to RX is as follows: The TX negotiates with the RX in the negotiation
phase (if requested by the RX). The TX uses FSK modulation to communicate with the RX. The
communication frequency is about 512 times the operating frequency.
5.6. FOD based on power loss
The power loss 𝑃𝐿𝑂𝑆𝑆, which is defined as the difference between the transmitted power 𝑃𝑃𝑇 and the
received power 𝑃𝑃𝑅, i.e. 𝑃𝐿𝑂𝑆𝑆 = 𝑃𝑃𝑇 − 𝑃𝑃𝑅, provides the power absorption in Foreign Objects (FO), as
shown in Figure 10.
Hardware description
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NXP Semiconductors 11
Figure 10. Power loss illustration
When a FO is introduced during power transfer, the power loss increases accordingly and the FO is
detected using the power-loss method.
The power-loss FOD method is divided into two types: FOD for the baseline power profile (TX and RX
can transfer no more than 5 W) and FOD for the extensions power profile (TX and RX can transfer more
than 5 W).
5.6.1. Power-loss FOD baseline
The equation for the power loss FOD baseline is 𝑃𝐿𝑂𝑆𝑆 = 𝑃𝑃𝑇 − 𝑃𝑃𝑅.
The transmitted power 𝑃𝑃𝑇 represents the amount of power that leaves the TX due to the magnetic field
of the TX, and 𝑃𝑃𝑇 = 𝑃𝑖𝑛 − 𝑃𝑃𝑇𝑙𝑜𝑠𝑠, where 𝑃𝑖𝑛 represents the input power of the TX and 𝑃𝑃𝑇𝑙𝑜𝑠𝑠 is the
power dissipated inside the TX. 𝑃𝑖𝑛 can be measured by sampling the input voltage and the input
current, and 𝑃𝑃𝑇𝑙𝑜𝑠𝑠 can be estimated through the coil current.
The received power 𝑃𝑃𝑅 represents the amount of power that dissipates within the RX due to the
magnetic field of the TX, and 𝑃𝑃𝑅 = 𝑃𝑂𝑢𝑡 + 𝑃𝑃𝑅𝑙𝑜𝑠𝑠. The power 𝑃𝑂𝑢𝑡 is provided at the RX output and
𝑃𝑃𝑅𝑙𝑜𝑠𝑠 is the power lost inside the RX.
When the WCT-15WTXAUTOSP charges a baseline-profile RX, the power-loss baseline is applied.
The TX continuously monitors 𝑃𝐿𝑂𝑆𝑆, and if it exceeds the threshold several times, the TX terminates
the power transfer.
5.6.2. Power-loss FOD extensions
The RX estimates the power loss inside itself to determine its received power. Similarly, the TX
estimates the power loss inside itself to determine its transmitted power. A systematic bias in these
estimates results in a difference between the transmitted power and the received power, even if there is
no FO present on the interface surface. To increase the effectiveness of the power-loss method, the TX
Hardware description
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can remove the bias in the calculated power loss using calibration. For this purpose, the TX and power
RX execute the calibration phase before the power transfer phase starts. The TX must verify that there is
no FO present on its interface surface before the calibration phase and the FOD based on the Q factor
can run.
Because the bias in the estimates can be dependent on the power level, the TX and RX determine their
transmitted power and received power under two load conditions—a “light” load and a “connected”
load. The “light” load is close to the minimum expected output power, and the “connected” load is close
to the maximum expected output power. Based on the two load conditions, the power transmitter can
calibrate its transmitted power using linear interpolation. Alternatively, the power transmitter can
calibrate the reported received power.
Take the calibrated transmitted power as an example:
𝑃𝑃𝑇𝑐𝑎𝑙 = 𝑎 ∗ 𝑃𝑃𝑇 + 𝑏
a =𝑃𝑃𝑅
(𝑐𝑜𝑛𝑛𝑒𝑐𝑡𝑒𝑑)− 𝑃𝑃𝑅
(𝑙𝑖𝑔ℎ𝑡)
𝑃𝑃𝑇(𝑐𝑜𝑛𝑛𝑒𝑐𝑡𝑒𝑑)
− 𝑃𝑃𝑇(𝑙𝑖𝑔ℎ𝑡)
b =𝑃𝑃𝑇
(𝑐𝑜𝑛𝑛𝑒𝑐𝑡𝑒𝑑)∗ 𝑃𝑃𝑅
(𝑙𝑖𝑔ℎ𝑡)− 𝑃𝑃𝑅
(𝑐𝑜𝑛𝑛𝑒𝑐𝑡𝑒𝑑)∗ 𝑃𝑃𝑇
(𝑙𝑖𝑔ℎ𝑡)
𝑃𝑃𝑇(𝑐𝑜𝑛𝑛𝑒𝑐𝑡𝑒𝑑)
− 𝑃𝑃𝑇(𝑙𝑖𝑔ℎ𝑡)
Therefore, the TX uses the calibrated transmitted power to determine the power loss as follows:
𝑃𝐿𝑂𝑆𝑆 = 𝑃𝑃𝑇𝑐𝑎𝑙 − 𝑃𝑃𝑅
When the WCT-15WTXAUTOSP charges an RX baseline, only the power-loss FOD baseline works. If
an RX extension is placed on the WCT-15WTXAUTOSP, the Q factor is measured to detect whether an
FO is present. If yes, the TX stops charging. Otherwise, the TX can proceed to the calibration phase and
the power-transfer phase and the power-loss FOD extension works to detect if an FO is inserted during
the power-transfer phase.
For details about FOD, see the WCT101xS Automotive MP-A9 Run-Time Debug User’s Guide
(document WCT101XARTDUG).
5.7. FOD based on Q factor change
A change in the TX coil environment typically causes its inductance to decrease or its equivalent series
resistance to increase. Both effects lead to a decrease of the TX coil Q factor. The RX sends a packet
including the reference Q factor for the TX to compare and determine whether an FO is present, as
shown in Figure 11. The reference Q factor is defined as the Q factor of the test power transmitter
#MP1’s primary coil at the operating frequency of 100 kHz with the RX positioned on the interface
surface and with no FO nearby. Due to design differences between the design and the reference power
transmitter #MP1 design, the measured Q factor values can differ. The TX must convert the Q factor it
measured to that of the test power transmitter #MP1. NXP provides a conversion method and must get
the parameters of the board first. The TX performs automatic calibration and gets the parameters the
first time it is powered up after flashing a new image, and these parameters are written to the flash.
Therefore, it is necessary to ensure that there is no object on the TX surface when it is powered for the
first time after flashing a new image.
Hardware description
WCT101xS Automotive MP-A9 V4.0 Wireless Charging Application, User's Guide, Rev. 0, 10/2018
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Figure 11. Quality factor threshold example
5.7.1. Free-resonance Q factor
The free-resonance Q factor detection detects the dumping ratio of the resonance signal, as shown in
Figure 12. With the system’s high Q, driving just a few pulses near the resonant frequency are sufficient
to serve as impulses and start the system ringing. Collect the ADC data of the tank voltage (or coil
current) and get the decay rate of the signal.
Q=𝜋/(-ln(Rate))
Rate is the value of the decay rate of a resonance signal.
Figure 12. Resonance signal
Application monitoring and control using FreeMASTER
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The circuit for the free-resonance Q measurement (which samples the signal on the resonance
capacitors) is shown in Figure 13.
Figure 13. Free-resonance Q measurement circuit
5.8. Coil selection
The Qi specification defines the MP-A9 as the more-than-one coil topology with one coil energized at a
time to realize the free-position charging.
The coil selection topology connects only one coil to the full-bridge inverter at a time. The coil is
equipped with the dual N-MOSFETs (Q9, Q12, or Q16), controlled by the WCT101xS controller
through the control interface based on low-power bipolar transistors.
5.9. Analog sensing
Some ADC0 and ACD1 ports of the WCT101xS are used to sense analog signals, such as temperature,
full-bridge input current, input voltage, and rail voltage.
6. Application monitoring and control using FreeMASTER
FreeMASTER is a user-friendly real-time debug monitor and data-visualization tool for application
development and information management. Supporting the non-intrusive variable monitoring on a
running system, FreeMASTER views the data from multiple variables in an evolving oscilloscope-like
display or in a common text format. The application can also be monitored and operated from the
webpage-like control panel.
6.1. Software setup
To set up the software, perform these steps:
1. Install FreeMASTER V2.0.2 (or later) from the NXP website (www.nxp.com/freemaster).
2. Plug the USB-UART converter board to the SCI connector J2, and connect the FreeMASTER
Micro-USB port to your computer.
3. Open the Device Manager, and check the number of the COM port.
Application monitoring and control using FreeMASTER
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NXP Semiconductors 15
Figure 14. Device Manager
4. Unpack the embedded source code onto your local drive.
5. Start the FreeMASTER application by opening:
<unpacked_files_location>/CommonMWCT101xS_WCT_WCT15WTXAUTOS.pmp.
6. Select “Project –> Options”.
Figure 15. “Options”
7. Ensure that the virtual “Port” (according to Step 3) and “Speed” fields are set correctly.
Application monitoring and control using FreeMASTER
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Figure 16. Setting “Port” and “Speed” fields
8. Ensure that the MAP file is correct. The default directory is:
<unpacked_files_location>/sample_app_wct_GHS.elf.
Figure 17. Setting the MAP file
9. Connect the FreeMASTER.
Power on the MP-A9 and start the communication by clicking the “STOP” button in the
FreeMASTER GUI.
Application monitoring and control using FreeMASTER
WCT101xS Automotive MP-A9 V4.0 Wireless Charging Application, User's Guide, Rev. 0, 10/2018
NXP Semiconductors 17
Figure 18. “STOP” button
6.2. Real-time application variables monitoring
FreeMASTER enables you to monitor and update all the application global variables. In this application,
several key variables are displayed in the scope windows. These variables are divided into different
blocks, as shown in Figure 19.
Figure 19. Real-time application variables
• “Power loss”—this block shows the variables and scopes with information about the power-loss
calibration, power-loss debugging, and current power-loss values.
• “Debug”—this block contains the debug values and scopes of ADC, FOD, temperature, Q factor,
and others.
• “Rx”—this block contains information about the receiver.
• “Board params”—this block contains current information about the board.
• “Tx”—this block lists the parameters of the transmitter.
Application monitoring and control using FreeMASTER
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18 NXP Semiconductors
• “Status & Errors”—this block contains information about the status and errors.
• “Samsung Fast Charge”—this block lists the status values of the Samsung fast charge-related
variables.
NOTE
Besides the variables above, all the global variables can be added to
FreeMASTER. How to generate and add variables to the watch window is
described in the FreeMASTER user manual.
6.3. Application parameters modification
The application parameters (NVM parameters) can be easily viewed and changed in the control panel.
The control panel contains the webpage elements (buttons, check boxes, and text fields) that provide a
user-friendly way to visualize and change the application control parameters.
Figure 20. Application variables
The application variables are divided into three tabs:
• “System Params”—parameters for system- and software-related settings.
• “Coil Params”—parameters for coils’ configuration and hardware-related settings.
• “Calibration”—group of parameters for input-current, input-voltage, and foreign-object-detector
calibration.
The meaning of each parameter is described next to its text field.
NOTE
The calibration parameters can be changed during run-time. The
parameters of “Op Params” don’t take effect immediately. To
modify the parameters in the “Op Params” page, enter the debug
mode, modify the parameters, and exit the debug mode. The
parameters then take effect.
Application monitoring through console
WCT101xS Automotive MP-A9 V4.0 Wireless Charging Application, User's Guide, Rev. 0, 10/2018
NXP Semiconductors 19
7. Application monitoring through console
The application sends some information and error states to the console through SCI. The information is
sent when the board is turned on, when the device is charging, or in case of an error state.
7.1. Software setup
1. Plug the USB-UART converter board to SCI connector J2, and connect the console Micro-USB
port to the computer.
2. Open Device Manager, and check the number of the COM port.
Figure 21. Device Manager
3. Run the communication program-supporting console (such as HyperTerminal or RealTerm).
4. Table 1 shows the communication setup.
Table 1. Port configurations
Port number Serial port from Device Manager
Baud 115200
Data bits 8
Stop bits 1
Parity None
Hardware flow control None
Display as ASCII
5. Open the port or start the communication, depending on the terminal used.
System bring-up
WCT101xS Automotive MP-A9 V4.0 Wireless Charging Application, User's Guide, Rev. 0, 10/2018
20 NXP Semiconductors
8. System bring-up
8.1. Ping sequences
When the low-power mode is disabled and no receiver is placed on the charging surface, the ping
sequence is as follows:
• Digital ping appears at about every 4.6 seconds in three batches.
• The following figures show the PWM waveforms of the digital ping sequence and ping patterns.
Figure 22. Digital ping batch
8.2. LED indication
The default LED display modes for different TX working states are shown in Table 2.
Table 2. LED display modes
LED No.
LED operational status
Standby Charging Charging
Complete
D fault TX fault RX fault
LED 1 (Red) Off Blink Off On On On
LED 2 (Green) Blink On On Off Off Off
The display pattern can be changed in DisplayUpdateLedStatus().
System bring-up
WCT101xS Automotive MP-A9 V4.0 Wireless Charging Application, User's Guide, Rev. 0, 10/2018
NXP Semiconductors 21
8.3. Debug messages
The system prints messages from a specified SCI port to inform you about what happened in the system.
The messages help you to understand the system working procedure and debug the issues.
• Message: DP
Prints the information about the digital ping.
• Message: ID
Prints the information about the board identification.
• Message: EXT
Prints the information about the extended identification.
• Message: NEG
Prints the information about the negotiation of new parameters.
• Message: XFER
Prints the information about the power transfer.
Document Number: WCT101XSV10AUG Rev. 0
10/2018
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