Understanding Smart Sensors - Nomads.usp

Communications for Smart Sensors 141Figure 6.11 Block diagram of MC143150 Neuron® chip.control capability; and (for the MC143150) 2 KB of RAM and 512 bytes ofEEPROM. Fuzzy logic kernels have been written for the Neuron® chip thatcan be used with support tools to easily implement fuzzy logic as part of thecontrol portion of the distributed network [25].6.8.4 MI-BusMotorola has developed a protocol called the MI-Bus for a low-cost networksolution. This approach for class A operation is built around Motorola’s HC05and HC11 MCUs and is designed to achieve low cost in certain master-slavecontrol applications. The MI-Bus protocol has been designed for direct controlof (low frequency) power loads [26]. The master-slave arrangement allows onemaster to control as many as eight slaves. The MI-Bus can be driven out of theI/O port. It should be noted that even with the considerable effort that hasbeen expended on J1850 and CAN specifications and hardware implementationsthat have been developed, a need for an alternative solution can be identifiedby a customer with sufficient volume to justify the development of acustom solution.The MCU initiates the protocol by issuing a sequence of 8 data bits thatcontain the 3-bit address and 5-bit control. The three address bits allow up toeight devices to be addressed. After transmitting data, the MCU reads serialdata from the selected device. Bus access method, frame sequence protocol,