ADD1000A QF128
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Overview
The ADD1000AQF128 is a Power Line Communications System on Chip, it implements a full PLC node. It includes an enhanced 8051 microcontroller (IP core ADD8051C12A), a Medium Access Controller (MAC) (IP core ADD1200) and a Modem circuit for the EHS/KNX Power Line medium specifications (IP core ADD1300). The MAC acts as link between the microcontroller and the modem, but it can be set in bypass mode allowing direct control of the modem by the microcontroller. The ADD1000 is designed to be used by OEM and provides a low cost and small size solution for narrow band power line communications.
ADD1000AQF128 uses 0.35u CMOS 3.3v supply, and is packed in a thin quad flat pack 128 leads, 0.4 mm pitch, package, this allows a reduced PCB area (16x16 mm) while maintaining a good thermal characteristics (Tja=41ºC/w). It can be used in continuous emission against short circuit in a 85ºC ambient.
Microcontroller
ADD8051C12A includes all features of the standard 8051 and additional ones: watchdog timer T3, ports P4 and P5, four interruption levels, double data pointer, software reset and Wake Up from Power Down interrupt activated and standard Serial Interface with additional baud rates. The microcontroller includes some specific peripherals as a 4 input / 4 output dimmer for power regulation, and a flash program loader that allows to store the microcontroller program in a standard SPI serial flash memory and to execute it from a SRAM. In the startup process the program is uploaded from serial flash to the parallel SRAM before start execution, after startup the free space in the serial flash can be used to store non volatile program data. The program is stored in the upper side of the SRAM, the lower side is used to store program data. Using a large flash several programs can be stored at the same time and the microcontroller can switch from one program to another, this feature could be used to reprogram the SoC using PLC downloading. Up to 24 ports are available to the user.
MAC
The ADD1200 is a hardwired Medium Access Controller. It has been developed to reduce the CPU computational load in PLC systems from 95% to 5%. Then the microcontroller is free to be use in the application tasks. MAC functional capabilities involve the construction of message packets, adding FEC (Forward Error Correcting Code) values to bytes and FCS (Frame Check Sequence) to packets. The ADD1000A MAC is compatible with EHS and KONNEX. However, his design is very versatile and allows users to create a wide range of datagram structures with the only constrain of FEC and FCS hardware codes. The MAC can be set in a bypass mode allowing direct connexion between the microcontroller and the modem.
Modem
The ADD1300 is a digital PLC modem that uses a single power supply of 3.3V and few external components. It is a full digital design and can be implemented in any digital technology from FPGA to ASIC. The ADD1300 can replace the traditional analog EHS modem and can use the same software libraries or a simplified version if the hardwired MAC is used. Modem Characteristics:
Additional Core Features
ADD8051C12A includes additional Special Function Registers, peripherals and features: