Integration Manual

Sivantos GmbH - R&D PSA WLS L DE ERL - Richard Rose

Page 1 of 3

Erlangen, 2021-08-06

Integration manual

for RF Module 5 (RFM005)

The “RFM005” radio module contains two radio transceivers running at 3.27 MHz and

2.45 GHz which are implemented in a single hardware platform.

The 3.27 MHz radio consists of a nearfield inductive magnetic transceiver. It uses time

division duplex and runs on a single channel with phase modulation. The signal is

transmitted by a coil antenna. The intended use of this radio is to exchange data between

two hearing aids or to communicate with a proprietary accessory.

The 2.45 GHz radio is mainly used for Bluetooth® Low Energy Radio communication. In

addition to that, the receiver is also capable of proprietary communication modes. The

transceiver is connected to a PCB-integrated antenna. The intended use of this radio is to

exchange data between hearing aids and Bluetooth accessories.

The main part of the module is a set of analog and digital ASICs which contain both radios.

These ASICs are mounted on a flex PCB. In addition to that the module comprises the coil

antenna for the nearfield inductive magnetic system, one crystal and an EEPROM

memory. The antenna for the 2.45 GHz radio is integrated in the flex PCB of the module.

The matching circuitry between the radio ASIC and the antenna is also on the flex PCB.

On the flex PCB additional components are mounted and connected to the radio module.

These include microphones, the connector to the external speaker, push buttons, the

telecoil and the battery connector. The system is powered by a lithium-ion battery, all

necessary voltage regulators are included in the module.

The PCB with the module and all other components of the hearing aid are arranged in a

plastic frame that is not user serviceable or user modifiable. The outer housing may be

replaced by field service, but this is not relevant for the wireless module.

The module is thus not installed but instead assembled at the same time as the host is.

The position of components and interconnection through the PCB are decided during the

project phase for the different hosts and following the best practice of the engineering

team in order to assure an optimal integration of the module.

Several validation steps are done through the development to assure the full compliance

with all the regulatory requirements.

PAGE 1
Integration manual for RF Module 5 (RFM005) The “RFM005” radio module contains two radio transceivers running at 3.27 MHz and 2.45 GHz which are implemented in a single hardware platform. The 3.27 MHz radio consists of a nearfield inductive magnetic transceiver. It uses time division duplex and runs on a single channel with phase modulation. The signal is transmitted by a coil antenna. The intended use of this radio is to exchange data between two hearing aids or to communicate with a proprietary accessory.
PAGE 2
The user guide must contain the HVIN, the FCC ID and the IC ID: HVIN: RFM005 Contains FCC ID: 2AXDT-RFM005 Contains IC ID: 26428-RFM005 and following statements: (English version) This Class B digital apparatus complies with Canadian ICES‑003. Changes or modifications made to this equipment not expressly approved by the legal manufacturer may void the FCC authorization to operate this equipment. This device complies with Part 15 of the FCC Rules and with ISED's licence-exempt RSSs.
PAGE 3
For body worn operation, this device has been tested and meets the FCC RF exposure guidelines when used with the legal manufacturer’s accessories supplied or designated for this product. Use of other accessories may not ensure compliance with FCC RF exposure guidelines. (French version) Cet appareil numérique de classe B est conforme à la norme canadienne ICES‑003.