iC-MB3 TSSOP24 Sample

Description

iC-MB3 is a single-chip BiSS/SSI interface controller featuring an 8-bit bus interface to industrial standard micro-controllers. An additional SPI interface mode also enables serial communication between iC-MB3 and the connected micro-controller. One to three BiSS devices can be attached to the sensor side of the device. These are connected up to clock line MA1 and data return line SL1 using RS422 transceivers (Figure 1). The BiSS devices can be connected directly in noise-free environments. A maximum of three BiSS slaves is supported, each with their own independently scalable data sections encompassing: 1) Sensor data from 0 to 64 bits (for measurement data, alarms and warnings) 2) Register data with 128 bytes per slave ID (e.g. for device parameters). iC-MB3 provides dual RAM memory banks for each slave, enabling flexible access of the micro-controller while new sensor data is being read in. A 32-byte intermediate memory supports register transfers. Sensor data acquisition is started by a micro-controller command or via pin GETSENS. Alternatively, iC-MB3 can also read in new sensor data automatically; the cycle time in this instance can be set as required. The end of sensor data acquisition and readin is signaled at pin EOT by a high; if faults occur during transmission pin NER signals a low. Errors in communication can be verified by the microcontroller via a status register; a system error message can also enter this register if bidirectional message pin NER is kept low by external intervention. iC-MB3 generates a clock signal for sensor communication using an internal 20 MHz oscillator. The clock can also be supplied externally.

Features