IC-MB3 datasheet(2/26 Pages) ICHAUS

2 / 26 page

iC-MB3

BiSS INTERFACE MASTER, 1-Chan./3-Slaves

Rev D1, Page 2/26

Figure 1: Point-to-point connection of iC-

MB3 and one bus subscriber. This can use 1

to 8 slave IDs (SID).

Figure 2: Example network of iC-MB3 and three subscribers. All

8 possible slave IDs (SIDs) are used distributed.

DESCRIPTION

iC-MB3 is a single-chip BiSS/SSI interface controller

featuring an 8-bit bus interface to industrial standard

microcontrollers. An additional SPI interface mode

also enables serial communication between iC-MB3

and the connected microcontroller.

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 con-

nected 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 microcontroller

while new sensor data is being read in. A 32-byte

intermediate memory supports register transfers.

Sensor data acquisition is started by a microcontroller

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 sig-

naled at pin EOT by a high; if faults occur during

transmission pin NER signals a low. Errors in commu-

nication 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 communi-

cation using an internal 20 MHz oscillator. The clock

can also be supplied externally.

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