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AMIS49587C5871RG Datasheet(PDF) 11 Page - ON Semiconductor |
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AMIS49587C5871RG Datasheet(HTML) 11 Page - ON Semiconductor |
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11 / 59 page  AMIS−49587 http://onsemi.com 11 INTRODUCTION GENERAL DESCRIPTION The AMIS−49587 is a single chip half duplex S−FSK modem dedicated to power line carrier (PLC) data transmission on low− or medium−voltage power lines. The device offers complete handling of the protocol layers from the physical up to the MAC. AMIS−49587 complies with the EN 50065 CENELEC and the IEC 1334−5−1 standards. It operates from a single 3.3 V power supply and is interfaced to the power line by an external power driver and transformer. An internal PLL is locked to the mains frequency (50 Hz or 60 Hz) and is used to synchronize the data transmission at data rates of 300, 600, 1200 and 2400 baud for a 50 Hz mains frequency, corresponding to 3, 6, 12 or 24 data bits per half cycle of the mains frequency (50 Hz or 60 Hz). 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−49587 are in the range of 9−95 kHz with a typical separation of 10 kHz. The conditioning and conversion of the signal is performed at the analog front−end of the circuit. The further 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 microprocessor 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. At the back−end side the link to the application hardware is provided by a SCI. The SCI is an easy to use serial interface, which allows communication between an external processor used for the application software and the AMIS−49587 modem. The SCI works on two wires: TXD and RXD. Baud rate is programmed by setting 2 bits (BR0, BR1). Because the low protocol layers are handled in the circuit, the AMIS−49587 provides an innovative architectural split. Thanks to this, the user has the benefit of a higher level interface of the link to the PLC medium. Compared to an interface at the physical level, the AMIS−49587 allows faster development of applications. The user just needs to send the raw data to the AMIS−49587 and no longer has to take care of the protocol detail of the transmission over the specific medium. This last part represents usually 50% of the software development costs. Minor User Type Major User Type SPY Application AMIS−49587 in MONITOR mode TEST Application AMIS−49587 in TEST mode CLIENT Application AMIS−49587 in MASTER mode SERVER Application AMIS−49587 in SLAVE mode SERVER Application AMIS−49587 in SLAVE mode Figure 3. Application Examples AMIS−49587 is an integrated circuit intended to connect equipment using Distribution Line Carrier (DLC) communication. It serves two major and two minor types of applications: • Major type: ♦ Server Applications which provide resources to a client. A typical application is an electricity meter device equipped for DLC ♦ Client Applications which exploit remote servers. A typical application is a concentrator system is a • Minor type: ♦ Spy Applications, used to monitor or test DLC communication on the channel. ♦ Test Mode, used to test the compliance of a PLC modem conforms to CENELEC. (Continuous broadcast of fS or fM). |
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