Continental BL28RW-RD1 Module User Guide

Continental BL28RW-RD1 Module User Guide

Terms and Acronyms

• CDMA Code Division Multiple Access
• DCM Data Connectivity Module
• DRX Discontinuous Reception
• ES Engineering Sample
• FDD Frequency Division Duplex
• GLONASS GLOBal’naya NAV igatsionnaya Sputnikovaya Sistema
• GNSS Global Navigation Satellite System
• GPIO General Purpose Input Output
• GSM Global System for Mobile
• HU Head Unit
• HSIC High Speed Inter-Chip
• LTE Long Term Evolution
• MP Mass Production
• NAD Network Access Device
• OEM Original Equipment Manufacturer
• PCB Printed Circuit Board
• PHY Physical Layer
• SIM Subscriber Identity Module
• TCU Telematics Control Unit
• TDD Time Division Duplex
• TSP Telematics Service Provider
• UMTS Universal Mobile Telecommunication System
• WCDMA Wideband Code Division Multiple Access

BL28RW-RD1 Module

The BL28RW-RD1 NAD is a proprietary modem module designed by Continental Automotive Systems, Inc. The modem will be integrated into Data Connectivity Modules (DCMs) or Head Units (HUs) designed and produced by Continental or by a 3rd party for use by automotive OEMs. DCMs will be installed into vehicles during the OEM’s factory assembly process and will not be accessible without use of special tools. Primary use-cases are data-centric with data and voice connections to Telematics Service Providers (TSP).

Key Features

LTE CAT4 NAD Module

Air Interface Support

• LTE FDD/TDD: 3GPP Rel 10
• LTE FDD CAT4 (up to 150-Mbps UL/50-Mbps DL)
• LTE TDD CAT4 (up to 90-Mbps UL/27-Mbps DL) for TDD Configuration1
• UMTS: HSUPA CAT 6 (up to 5.76-Mbps), HSPA CAT24 (up to 21-Mbps)

Regulatory Compliance Notes

FCC:

This device complies with Part 15, Part 22(H), Part 24(E) and Part 27 of the FCC Rules. The FCC ID for this device is LHJ-BL28RWRD1. Operation is subject to the following two conditions:

1. This device may not cause harmful interference.
2. This device must accept any interference received, including interference that may cause undesired operation.

If a host was previously authorized as an unintentional radiator under the Supplier’s Declaration of Conformity procedure without a transmitter certified module and a module is added, the host manufacturer is responsible for ensuring that the after the module is installed and operational the host continues to be compliant with the Part 15B unintentional radiator requirements. Since this may depend on the details of how the module is integrated with the host, Continental Automotive Systems, Inc. shall provide guidance to the host manufacturer for compliance with the Part 15B requirements.

Europe:
Hereby, Continental Automotive GmbH declares that the radio equipment type BL28RW-RD1is incompliance with Directive 2014/53/EU. The full text of the EU declaration of conformity is available at the following internet Address. https://www.continental-homologation.com/en-gl/Daimler

Device Installation and User Manual

The BL28RW-RD1 module is a proprietary product designed and manufactured by Continental Automotive Systems, Inc. for integration into telematics control units manufactured by Continental Automotive Systems, Inc. for automotive OEMs.

1. The module is limited to installation ONLY in an integrated device manufactured by Continental Automotive Systems, Inc.
2. During manufacturing process of the integrated device, the module is soldered onto the pcb of the integrated device.
3. The integrated device must provide RF connectors to external antennas or RF traces to connect theBL28RW-RD1 modules to antennas inside the integrated device. The typical reference design for the RF trace layout, including pcb stack-up and trace length is described in Section 6 of this document.
4. Automotive OEM is responsible for ensuring that the end user has no manual instructions to remove or install module.
5. The module is limited to installation in mobile applications, according to Part 2.1091(b).
6. No other operation configurations are allowed.
7. Changes or modifications to this system by other than a facility authorized by Continental could void authorization to use this equipment.
8. The module must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operate in conjunction with any other antenna or transmitter; except in accordance with FCC multi transmitter product procedures. If device is collocated with other transmitters, compliance with regulatory requirements must be done. Additional testing and certification for SAR will be required if the distance limitation cannot be met.
9. The integrator is responsible for fulfilling FCC and IC requirements for the integrated device.

If Continental chooses to re-use modular approval, then the TCU shall be clearly labeled with an external label containing the integrated modem’s FCC ID. For example, the label can include text “Contains device with FCC ID: LHJ- BL28RWRD1”.

Antenna requirements for use with BL28RW-RD1 module:

• The module must be installed to provide a separation distance of at least 20 cm from all persons and must not be co-located or operate in conjunction with any other antenna or transmitter; except in accordance with FCC multi-transmitter product procedures. If device is collocated with other transmitters, compliance with regulatory requirements must be done. Additional testing and certification for SAR will be required if the distance limitation cannot be met.
• The BL28RW-RD1 module is for use with external antennas ONLY.
• For all LTE/WCDMA/GSM operating bands the maximum antenna gain including cable loss shall not exceed the following values:
  • GSM 850: 7.1 dBi
  • GSM 1900: 2.5 dBi
  • WCDMA Band 2: 8.5 dBi
  • WCDMA Band 4: 5.5 dBi
  • WCDMA Band 5: 9.5 dBi
  • LTE Band 2: 9.0 dBi
  • LTE Band 4: 6.0 dBi
  • LTE Band 5: 10.0 dBi
  • LTE Band 7: 9.0 dBi
• This radio transmitter (FCC ID: LHJ-BL28RWRD1) has been approved by FCC to operate with the antenna types listed below with the maximum permissible gain indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.

Instructions to OEMs:

Continental must instruct the automotive OEM and provide them to include the following information into the car user’s manual (i.e. for the DCM):

1. End-users must be provided with transmitter/antenna installation requirements and operating conditions for satisfying RF exposure compliance:
2. A separate section should clearly state “FCC RF Exposure requirements:”
3. Required operating conditions for end users.
4. The antenna used with this device must be installed to provide a separation distance of at least 20cm from all persons, and must not be co-located or operating in conjunction with any other antenna or transmitter, except in accordance with FCC multi-transmitter product procedures. If device is collocated with other transmitters, compliance with regulatory requirements must be done. Additional testing and certification for SAR will be required if the distance limitation cannot be met.
5. The Maximum ERP/EIRP and maximum antenna gain required for compliance with Parts 15, 22H,24E, and 27.
6. Clear instructions describing the other party’s responsibility to obtain station licensing.

Layout and Routing Recommendations

Module Specific

The pad spacing of 1mm should allow the placement of a 600 um finished VIA between pads, while maintaining a 200um Via- to-trace or Via-pad spacing, to facilitate the breakout of inner row signals. The1mm spacing is also large enough to route two 200 um (8 mil) traces between pads.

Figure 6- 1 Vias placed between Pads

RF Traces for antennas

The NAD has three antenna pins

• PRIMARY_ANT
• SECOND_ANT
• GNSS_ANT

The figure below shows the general breakout of the module:

Figure 6-2: NAD Pin Breakout

The LTE CAT4 NAD should be oriented on the main board to minimize the length of the PRIMARY_LTE antenna pin (LTE Ant1). This 50ohm line should be as short as possible to the external RF connector or internal antenna feed point.

The RF traces from the NAD antenna pins on the main board can be strip line or micro strip. For the strip line approach, vi as should be placed to the NAD EDGE SIDE of the pins as close as possible to the NAD antenna pads to minimize any impedance discontinuity (see figure 38). For the micro strip approach, the PCB insertion loss will be less but the short route under the NAD MUST BE TREATEDAS STRIPLINESOIT WILL BE NARROWER UNDER THE NAD THAN THE MICROSTRIP LINE.

The NAD has ground cleared out under the RF antenna routes as shown below:

Figure 6- 2: Antenna Pad Ground Cutout (Top View)

For routing micro strip lines UNDERNEATH the NAD on layer 1, these ground cutouts internal to the NAD need to be accounted for in the strip line calculation. The internal GND height and dielectric constant of the NAD board are shown below:

H = 19.3 mils (491 micron)
Dielectric Constant = 4.1

For example, consider the following stack up for a main PCB:
Figure 6- 3

Assume the main PCB above with a 6 layer stack up with ground cut away on layer 2 so the micro strip lines reference ground on layer 3. The dielectric thickness from L1 to L3 is 21.2 mils.

Using an online impedance calculator, the line width under the NAD for a 50 ohmline is 16.9mils (433micron) shown below:
Figure 6- 4

The calculation for the micro strip line width outside the NAD is 37.7mils (967micron) shown below:
Figure 6- 5

Due to the nature of the weave chosen for each PCB, the dielectric constant of the NAD board is 4.1whilethe main board is 4.3. A dielectric constant of 4.2 was chosen in the strip line calculation, while 4.3wasused for the micro strip calculation.

Main board stack up may vary so these line widths may need to be recalculated. IT IS HIGHLYRECOMMENDED TO USE A SIMILAR STACKUP AS SHOWN IN FIGURE 39 WITHMICROSTRIPROUTING AND GND CUTS ON LAYER 2 WITH GND REFERENCE ON LAYER3. THERESHOULD BE NO ROUTING ON L2 AND SOLID GND ON L3 UNDERNEATH THESEANTENNALINE MICROSTRIP TRACES.

The antenna traces need to routed STRAIGHT OUT OF THE NAD TO THE NEAREST NAD EDGE.
The lines need to be tapered from 433micron to the 967micron width gradually but quickly.
Figure 6- 6

These line widths may vary depending on the stack up selected for the main board

RF Antenna Layout Parameters

stitched VIA to ground
Spacing to other signals| < 3:1**

• Signals should be routed along similar route path, but separated by ground trace.
• Trace impedances should match the table, either as micro strip or strip line.
• Total length for both signals should match the table.
• Spacing to ground or other signals on outside of bundled signals should match the table.

References

• Homologation - Daimler

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