preliminary

preliminary

MB4U

BiSS, SSI, PC-USB 2.0 ADAPTER

Rev C1, Page 6/16

GALVANIC COUPLING OF USB, POWER SUPPLY, GND, SIGNALS AND SHIELD

The MB4U provides VB, VDD, GND, Shield and the

BiSS signals MA+, MA-, MO+, MO-, SL+ and SL- with

galvanic coupling to the USB interface. Before connect-

ing sensors or cable adapter to the MB4U the system

GND and shielding potential needs to be identical with

the adapter GND and adapter shield to prevent ground

loops and potential differences.

MB4U is galvanically coupled. A common GND potential and

shield potential is mandatory. If a galvanic isolation is required,

the signals and supply path needs to be de-coupled by 3rd party

devices/isolators.

BiSS POWER SUPPLY CONTROL

The MB4U supplies VB and VDD voltages with allo-

cating and initializing the adapter. With de-allocating

the adapter resource or the software the voltages VB

and VDD are turned off to permit a safe unplugging of

connected devices.

The un-powering of VB and VDD requires a non volatile

device content storing before closing the interface

adapter in any software environment.

MB4U may not be supplied into VB nor VDD. If the sensor needs

to be supplied by 3rd power supply, the GND needs to be identical

and any backwards supply into VB nor VDD of the adapter MB4U

is not permitted.

BiSS MASTER IP MB100

The MB4U is based on the MB100 BiSS master IP.

With this implementation it is possible to connect one or

more BiSS devices or a single SSI device to the adapter.

The BiSS C and BiSS B protocol is fully supported. The

adapter supports the maximum directly addressable

count of BiSS C slave devices: 8 slaves.

With BiSS there is 10 MBit/s RS422 maximum clocking

available. The SSI protocol is also configurable.

With high speed buffered transfer the real-time mea-

sured data can be block-wise transferred to a Windows

PC application for analysis, documentation, data pro-

cessing, etc.

Too high frame repetition rates may exceed the capabilities of the

used USB interface and the used PC. A limitation of frame repetition

rates may be possible by system setup and details.