Rework List for the WCT-15W1COILTX Rev.3 Board
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1 NXP Semiconductors Document Number: WCT1012V31RLAN Application Note Rev. 0, 02/2017 Rework List for the WCT-15W1COILTX Rev.3 Board 1. Introduction In the WCT-15W1COILTX solution, the Q factor detection is implemented to meet the Qi Medium Power V1.2.2 specification requirements. The external driver Q factor detection method is used in the WCT-15W1COILTX V3.0 release. To reduce the BOM cost and enhance the solution competitiveness, the free resonance Q factor detection method is implemented in the WCT-15W1COIL TX V3.1 release, which requires less external parts and leaves more WCT resources for customers applications. This document describes how to rework the WCT- 15W1COILTX Rev.3 board (PCB no.: REV C, EVK board no.: REVA) to support the WCT-15W1COILTX V3.1 release. The customer can rework the EVK board according to the rework list. Contents 1. Introduction Q Factor Detection External driver Q factor detection Free resonance Q factor detection Rework List for the WCT-15W1COILTX Rev.3 Board Reference Schematic for New Design References Revision History NXP B.V.
2 Q Factor Detection According to the Qi Medium Power V1.2.2 specification, Q factor detection is preferred to detect the FO before power transfer. When the medium RX is put on the interface of the transmitter (TX), the TX starts to detect the Q factor of the coil. If the Q factor is lower than the threshold, which is determined by the receiver (RX) reported Q factor, the FO is detected. 2. Q Factor Detection Many methods can be used to detect the Q factor. In the WCT-15W1COILTX V3.1 release, the external driver Q factor detection and free resonance Q factor detection are supported External driver Q factor detection Applying the external driver source on the resonant network, the Q factor can be calculated by the formula Q = /, where V1 is the external driver source and V2 is the resonant voltage. The external driver source is produced with LDO. Figure 1. External driver Q factor method Figure 2. External driver source The external source voltage and resonant voltage are sent to ADC ports after conditioning and filtering. 2 NXP Semiconductors
3 Q Factor Detection Figure 3. External driver Q factor measurement circuit 2.2. Free resonance Q factor detection Applying a narrow pulse driver on the resonant network, and monitoring the time and value of the free resonance after removing the narrow pulse driver, the Q factor can be achieved by the formula Q= /(- ln(rate)), in which Rate is the decay rate value of the resonance signal. Figure 4. Free resonance signal With free resonance Q factor method, the narrow pulse driver can be produced with the input voltage and no more circuits are needed, which saves on cost compared with the external driver Q factor detection method. Only one analog signal should be sent to the ADC port after conditioning and filtering. NXP Semiconductors 3
4 Q Factor Detection Figure 5. Free resonance Q factor measurement circuit 4 NXP Semiconductors
5 Rework List for the WCT-15W1COILTX Rev.3 Board 3. Rework List for the WCT-15W1COILTX Rev.3 Board The WCT-15W1COILTX Rev.3 board is available on the NXP website: By default, the WCT-15W1COILTX EVK board supports the external driver source Q factor detection method. As the free resonance Q factor detection method is supported with the lower BOM cost by default in the V3.1 release, the WCT-15W1COILTX Rev.3 board needs to rework some parts to support the V3.1 release. Table 1. Rework list for the V3.1 release Part Reference Initial value Action Updated value R k change to 0R C pf change to 27pF R90 DNP change to 0R R99 DNP change to 0R R102 DNP change to 0R R91 0R delete / The locations of the reworked parts are marked in the following figure. NXP Semiconductors 5
6 Rework List for the WCT-15W1COILTX Rev.3 Board Figure 6. Rework work parts locations 6 NXP Semiconductors
7 Reference Schematic for New Design 4. Reference Schematic for New Design If the customer wants to apply the free resonance Q factor detection method in a new design, the following schematic can be taken as a reference. NXP Semiconductors 7
8 Reference Schematic for New Design Figure 7. Reference schematic 8 NXP Semiconductors
9 Revision History 5. References NXP wireless charging solution page: WPC page: WCT1012 Documents: - WCT W Single Coil TX V3.1 Reference Design System User s Guide (WCT1012V31SYSUG) - WCT1012 TX V3.1 Library User s Guide (WCT1012V31LIBUG) - WCT W Single Coil TX V3.1 Runtime Debugging User s Guide (WCT1012V31RTDUG) - WCT W1COILTX V3.1 Release Notes (WCT1012V31RN) 6. Revision History Table 2. Revision history Revision number Date Substantive changes 0 02/2017 Initial release. NXP Semiconductors 9
10 How to Reach Us: Home Page: nxp.com Web Support: nxp.com/support Information in this document is provided solely to enable system and software implementers to use NXP products. There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits based on the information in this document. NXP reserves the right to make changes without further notice to any products herein. NXP makes no warranty, representation, or guarantee regarding the suitability of its products for any particular purpose, nor does NXP assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Typical parameters that may be provided in NXP data sheets and/or specifications can and do vary in different applications, and actual performance may vary over time. All operating parameters, including typicals, must be validated for each customer application by customer s technical experts. NXP does not convey any license under its patent rights nor the rights of others. NXP sells products pursuant to standard terms and conditions of sale, which can be found at the following address: nxp.com/salestermsandconditions. NXP, the NXP logo, Freescale, and the Freescale logo are trademarks of NXP B.V. All other product or service names are the property of their respective owners. All rights reserved NXP B.V. Document Number: WCT1012V31RLAN Rev. 0 02/2017
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