SLG datasheet(4/7 Pages) ETC2

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Version 4 – September 2015

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3 Communication with the Sensor

The SLG flow meter shows bidirectional, linear

transfer characteristics. The product comes fully

calibrated for water.

Digital Sampling Time, 16 bit

74 ms

Digital Sampling Time, 9 bit

1 ms

3.1 Electrical Specifications

Table 2: DC Characteristics

Parameter

Conditions Min. Typ. Max. Units

Power Supply

DC, VDD

Sensor only

w. SCC1-RS485

w. SCC1-Analog

Operating

Current

VDD = 4-6 V

5.1

w. SCC1-RS485

w. SCC1-Analog

4.3

3.2 Electrical Connector and Pinout

The flow meter is equipped with a male connector

type M8, 4-pin, threaded lock according to

IEC 61076-2-101 (Ed. 1)/ IEC 60947-5-2, and is

compatible with Sensirion’s SCC1 interface cables.

Table 3: Electrical pinout

SDA (data)

GND

VDD

SCL (clock)

3.3 Communication via USB cable

The Sensirion USB Sensor Cable provides an easy to

use USB Interface for laboratory and desktop use.

For further information please see the SCC1-USB

Sensor Cable datasheet, available on

www.sensirion.com/liquidflow-download.

3.4 Digital Communication via RS485-Bus

The SCC1-RS485 Sensor Cable for flow sensors

allows the communication via RS485 interface for use

in a demanding industrial automation environment. In

addition to the standard commands available in the

I²C interface of the sensor, the incorporated

microcontroller of the cable provides more complex

logic such as a dispense volume totalizer, automatic

dispense detection, automatic heater control and data

buffer for asynchronous read-out.

For further information please see the SCC1-RS485

Sensor Cable datasheet, available on

www.sensirion.com/liquidflow-download.

3.5 Analog Communication

The SCC1-ANALOG Sensor Cable allows simple and

quick readout of Sensirion’s liquid flow meters by

converting the digital sensor reading to a 0...10.5 V

analog voltage output. Additionally, a digital (high/low)

output with two different modes of operation is

available (Flow Switch / Volume Counter).

For further information please see the SCC1-Analog

Sensor Cable datasheet, available on

www.sensirion.com/liquidflow-download.

3.6 Digital Communication via I²C-Bus

Digital communication between a master and the SLI

sensor runs via the standard I²C-interface. The

physical interface consists of two bus lines, a data line

(SDA) and a clock line (SCL) which need to be

connected via pull-up resistors to the bus voltage of

the system.

These lines can be used on 3.3V or 5.0V level with a

clock frequency of 100 kHz. For the detailed

specifications of this I²C communication, please refer

to specific I²C Application Notes from Sensirion.

Table 4: I²C Output Characteristics

Parameter

Min. Typ. Max. Units

I2C Bus Clock Frequency

100

kHz

Output Voltage Low

(SDA/SCL), Isink = 6mA

0.1

0.5

Low Level Output Current

(SDA/SCL)

High Level Input Voltage

(SDA/SCL)

2.0

Low Level Input Voltage

(SDA/SCL)

1.0

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