USER MANUAL WMI Wireless Mobile Interface A2C166288 A2C166290 A2C166291 A2C166292 A3C011059 A3C011064 A3C054140 A3C054142 A3C017277 A3C027269 A3C017280 A3C011153 D-WMI2020A D-WMI2020A_User_Manual_update6.docx Page 1 1. System Overview Continental Wireless Power Charger is developed for automotive applications under the name WMI which includes three functions like:
- WPC: Wireless power charger
- NFC: Near field communication The WMI module and their implementation in different variants inside the vehicle is depicted in Fig. 1. Fig. 1 : WMI module and WMI automotive implementation inside the vehicle 1.1 WPC WPC feature of the WMI uses Qi standard of Wireless Power Consortium (WPC) for enabling wireless charging from a base station unit to mobile device. The power transfer method is based on near field magnetic induction between coils. 1.1.1 System Overview The WMI wireless charger provides power transfer from the internal coil to the smartphones'
battery. The power transfer technology is based on Qi standard operating with a fixed frequency of 127.7kHz+/-6kHz. A simple operational description of wireless power transfer can be summarized in two operational modes. The first mode with a defined burst sequence allows the transmitter to detect the smartphone Qi compliant. Then, the second mode allows the power transfer from the WMI to the smartphone. Details of each operational mode are presented below:
In this operational mode, the WMI module transmits a short time carrier signal with a specific pattern to detect a smartphone. When a mobile device is placed on the WMI, the identification and the collection of configuration information is done. Based on that D-WMI2020A_User_Manual_update6.docx Page 2 1.1.2 WPC modes 1.1.2.1 Ping mode information, the transmitter creates a power transfer contract containing the maximum power to be delivered to the load. 1.1.2.2 Charging mode After Ping mode, the power transfer starts. In this operational mode, the transmitter sends the carrier at a given level defined in the power contract in the operational Ping mode. The WMI controls the power transferred to the smartphone, in response to the control data messages sent by the smartphone. 1.1.2.3 Transmitter to receiver communications The WMI transmitter communicates to the mobile device using Frequency Shift Keying, in which the Transmitter modulates the Operating Frequency of the Power Signal. 1.1.3 WPC parameters Bellow in table 1, the technical parameters of the WMI WPC feature are specified:
Parameters Carrier frequency Frequency shift Supply voltage Voltage supply range Max. power consumption Product operating temperature range Smartphone operating temperature range WPC chipset brand WPC litz coil WPC litz coil gain @ 127.7kHz Max. output power Max. current consumption Vehicle fuse protection Product weight Dimensions (X/Y/Z in mm) Values 127.7 kHz
+/- 6 kHz 12V battery 9V < Vbat < 16V 35W (25W typ)
-40C < Temp < 85C
-20C < Temp < 60C IDT Single coil MPA19 according to Qi standard
-107.1 dBi 15W 3.5A (2A typ) 7.5A 270 g 170/90/33 mm Table 1: WMI WPC technical parameters. The rated output power from the WPC coil is Max. 15W transferred to the load. The receiver manages the wireless charger in order to guarantee stable 15W on the load. 1.2 NFC NFC Reader used NFC (Near Field Communication) technology the communication between phones and cards with the vehicle, having user functions like, BT pairing and Wi-Fi pairing. The WMI integrates only one NFC transceiver at 13.56MHz connected via switches to an internal NFC antenna and to an external antenna. Only one NFC antenna is fed at a given time. to enable D-WMI2020A_User_Manual_update6.docx Page 3 Fig. 2 : WMI NFC block diagram 1.2.1 NFC Parameters Bellow in table 2, the technical parameters of the WMI NFC feature:
Parameters Carrier frequency Modulation type Data rate max. Supply voltage Voltage supply range Product operating temperature range Smartphone operating temperature range NFC chipset brand NFC chipset model number Vehicle fuse protection Amplitude Shift Keying (ASK) Values 13.56 MHz 848 kbps 12V battery 9V < Vbat < 16V
-40C < Temp < 85C
-20C < Temp < 60C NXP Semiconductors NCF3340EHN 7.5A Table 2: WMI NFC technical parameters. 1.2.2 NFC antennas The NFC reader is composed of two antennas, internal and external antenna.
- The internal antenna is that one is implemented inside the WMI module.
- The external antenna is that one connected to the WMI module. Fig. 3: NFC antennas of D-WMI2020A 1.2.2.1 NFC internal antenna:
Here bellow is shown the NFC antenna for High and Low WMI versions. D-WMI2020A_User_Manual_update6.docx Page 4 Large Antenna PCB: NFC internal antenna trace on Small Antenna PCB: NFC internal antenna antenna PCB is shown in green trace on antenna PCB is shown in green Fig. 4: NFC Internal antennas The electrical parameters of the NFC internal antenna are listed in the following table Parameters Antenna type Number of turns Antenna Size Antenna Gain (dBi) @ 13.56MHz Antenna Gain (dBi) @ 13.56MHz Planar Printed Coil on PCB Values 3 109mm x 43mm Large antenna = -50.8 dBi Small antenna = -51 dBi Table 3: NFC internal antenna electrical parameters. D-WMI2020A_User_Manual_update6.docx Page 5 1.2.2.2 NFC external antenna:
The NFC external antenna is an external component connected to the D-WMI2020A. Three variants of the external antenna are presents with the following dimensions and electrical characteristics. NFC Ext 1: Cable length 260mm Parameters Antenna model number Antenna type Number of turns Antenna Size Antenna Gain (dBi)
@ 13.56MHz Values A2C16632101 Wire winding on plastic holder 3 59mm x 34.7mm
-53.3 dBi NFC Ext. 2: Cable length 370mm Parameters Antenna model number Antenna type Number of turns Antenna Size Antenna Gain (dBi)
@ 13.56MHz Values A3C020778 Wire winding on plastic holder 3 50mm x 34.7mm
-55.4 dBi NFC Ext. 3: Cable length 370mm for carbon cover Parameters Antenna model number Antenna type Number of turns Antenna Size Antenna Gain (dBi)
@ 13.56MHz Values A3C020776 Wire winding on plastic holder 3 59mm x 34.7mm
-58.1 dBi D-WMI2020A_User_Manual_update6.docx Page 6 2. WMI vehicle installation distance relative to human body Minimum distances from WMI to human body are described here bellow. These figures are mechanical separation distances from the transmitter to people seating within the car and do not represent the minimum compliance distance for RF exposure. Minimum RF exposure distance compliance is demonstrated at 0cm as per ISED RSS102 issue 5 and FCC 2.1093 requirements. Separation distances from WMI to Human body (in cm) WPC + NFC_int Sitting on Knee
(side) Leg
(side) Body
(side) Hand
(top) Driver 6.2 7.8 Co-driver 19.6 20.4 Driver 46.6 19.8 Co-driver 46.6 19.8 Driver 53.9 33.8 Co-driver 53.9 33.8 38.3 40.5 14.7 14.7 16.6 16.6 9.7 12.6 18.6 18.6 19.6 19.6 Arm
(top) 23.5 23.5 16.7 16.7 5 5 Head
(top) 78.9 78.9 70.7 70.7 59.1 59.1 Rear 50.4 11.5 10.3 18.3 7.3 58.3 Rear 35.4 10.8 18.4 12.4 12.9 69.3 Rear 7.5 8.7 29.7 0 12.5 70 Separation distance from WMI to Human body (in cm) NFC_ext Sitting on Knee
(side) Leg
(side) Body
(side) Hand
(top) Arm
(top) Head
(top) Front Driver 30 7.4 31.5 7 19.9 65.4 Front Middle Storage Armrest Middle HVAC Armrest 5 seater rear armrest 4 seater under armrest 4 seater outside armrest D-WMI2020A_User_Manual_update6.docx Page 7 WEEE logo shall be printed in vehicle user manual. 3. Logos Safety mark shall be lasered on product label and printed in vehicle user manual. 4. Regulatory statements Safety statement shall be printed in vehicle user manual. NCC ISED
This device contains licence-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development Canadas licence-exempt RSS(s). Operation is subject to the following two conditions:
(1) This device may not cause interference.
(2) This device must accept any interference, including interference that may cause undesired operation of the device. D-WMI2020A_User_Manual_update6.docx Page 8 FCC Lemetteur/recepteur exempt de licence contenu dans le present appareil est conforme aux CNR dInnovation, Sciences et Developpement economique Canada applicables aux appareils radio exempts de licence. Lexploitation est autorisee aux deux conditions suivantes :
1) Lappareil ne doit pas produire de brouillage;
2) Lappareil doit accepter tout brouillage radioelectrique subi, meme si le brouillage est susceptible den compromettre le fonctionnement. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may cause undesired operation. CAUTION TO USERS Changes or modifications not expressly approved by the party responsible for compliance could void the user`s authority to operate the equipment. D-WMI2020A_User_Manual_update6.docx Page 9