MB3U, MB3U-I2C

BiSS TO PC-USB ADAPTER

Rev B2, Page 2/7

BiSS Plug Pin Configuration

Pin

Name

Function

1

VB

Optional: powered by ext. supply

2

MA +

Clock output P

3

MA -

Clock output N

4

VDD

5

MO -

+5 V High-level signal

Optional: master data output N

6

GND

Ground (0 V)

7

SL +

Data input P

8

SL -

Data input N

9

MO +

0 V Low-level signal

Optional: master data output P

Power Supply Socket

Inner contact

Negative pole

Outer contact

PC-USB Adapter With I2C Extension

The BiSS and I2C to PC-USB Adapter has an addi-

tional plug for I2C or SPI communication. The USB

port supplies the sensors via the I2C plug with 5 V (up

to 250 mA, through Pin 4 - no galvanic isolation). If

there is load applied to the BiSS connector, the max-

imum current supplied via the I2C plug is decreased.

For more power, an additional external power supply is

recommended (the wall power supply does not supply

the I2C plug, see Figure 3). I2C multi-master capability

is not provided.

Technical Data I2C / SPI Interface

• Serial computer bus communication I2C

• Serial computer bus communication SPI

• Sensor supply sourced from the USB port

(+5 V up to 250 mA) without isolation

• I2C data rates of up to 320 kHz

• USB 2.0 compatible

42 x 95 x 24 mm

BiSS Plug

9-pole SUB-D

size approx.

2-pole, 6.6/1.9 mm

Power Supply Socket

10-pole

DIN 45323

I2C Plug

USB-B Plug

4-pole

1

2

Figure 2: iC-MB3 iCSY MB3U-I2C

I2C Plug Pin Configuration For I2C-Link

PIN

Name

Function

1

SCL

Serial Clock Line

2

GND

Ground

3

-

Reserved

4

+5 V

Supply Voltage

5

-

Reserved

6

-

Reserved

7

SDA

Serial Data Line

8

-

Reserved

9

SDA

Serial Data Line

10

GND

Ground

Note: To use I2C, pin 7 and pin 9 must be short.

I2C Plug Pin Configuration For SPI-Link

PIN

Name

Function

1

SCLK

Serial Clock

2

GND

Ground

3

-

Reserved

4

+5 V

Supply Voltage

5

-

Reserved

6

-

Reserved

7

MOSI

Master Out Slave IN

8

NCS

Not Chip Select

9

MISO

Master In Slave Out

10

GND

Ground

* 100 mA for +5 V and +12 V available starting from 2008