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AMIS-30585

S-FSK PLC Modem

ON Semiconductor 

AMIS-30585

Figure 1: S-FSK Modem AMIS-30585 Block Diagram

4.0 Description

The AMIS-30585 is a single chip modem dedicated to power line carrier (PLC) communication in compliance to the European standard

IEC 1334-5-1 and IEC 1334-4-32.

S-FSK is a modulation and demodulation technique that combines some of the advantages of a classical spread spectrum system (e.g.

immunity against narrow band interferers) with the advantages of the classical FSK system (low complexity). The transmitter assigns

the space frequency fs to “data 0” and the mark frequency fm to “data 1”. The difference between S-FSK and the classical FSK lies in the

fact that fs and fm are now placed far from each other, making their transmission quality independent from each other (the strengths of

the small interferences and the signal attenuation are both independent at the two frequencies). The frequency pairs supported by the

AMIS-30585 are in the range of 9-95kHz with a typical separation of 10kHz.

The circuit is mostly digital. The conversion of the analog signal is performed at the front-end of the circuit. The processing of the signal

and the handling of the protocol is digital. At the back-end side, the interface to the application is done through a serial interface. The

digital processing of the signal is partitioned between hardwired blocks and a microprocessor block. The micro-processor is controlled

by firmware. Where timing is most critical, the functions are implemented with dedicated hardware. For the functions where the timing is

less critical, typically the higher level functions, the circuit makes use of the ARM 7TDMI microprocessor core.

The processor runs DSP algorithms and, at the same time, handles the communication protocol. The communication protocol, in this

application, contains the MAC = Medium Access Control Layer. The program running on the microprocessor is stored into an on-board

ROM. The working data necessary for the processing is stored in an internal RAM. For the back-end side, the link to the application

hardware, a SCI is provided. The SCI is an easy to use serial interface, which allows communication between an external processor

used for the application software and the AMIS-30585 modem. The SCI works on two wires: TXD and RXD. Baud rate is programmed

by setting 2 bits (BR0, BR1).

Rev. 2 | Page 2 of 23 | www.onsemi.com

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