SFM3000 datasheet(3/7 Pages) ETC2

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Version 2 – February 2014

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2. Electrical Specifications

2.1

Electrical characteristics

Electrical properties

Condition

Value

Unit

Interface

I2C

Default Sensor Address

64 (h40)

Soft Reset Time

Start-up Time 12

Max.

100

Supply Voltage (VDD)

5V +/-5%

Communication Level

High

Low

Min.

Max.

2.5

GND

VDD

1.1

Power Consumption

< 50

Electrical Connector

2 mm pitch, 4 pins in a row

Output signal resolution

1413

bit

Scale Factor Flow

Air, N2

140

142.8

1/slm

Offset Flow

32’000

After 4.75V is reached

16 bit with two least significant bits always zero

2.2

Pin layout and mechanical concept of the

electrical connection

The SFM3000 is designed for both connector attachment

and through-hole technology hand-soldering to a PCB.

2.2.1

Connector attachment

The SFM3000 sensor’s 4-pin 2 mm pitch electrical

connector is compatible with Molex DuraClik™ socket

(Molex product number: 502351-0400). For this type of

connection please order the SFM3000 with a cap

(according to the ordering information in Chapter 5).

Diverse 4-core flat ribbon cables with crimp fittings can be

used for electrical connection.

2.2.2

PCB soldering

Standard selective soldering systems may be used for

soldering SFM3000 sensors. Reflow soldering is not

feasible and may damage the sensor. The sensor ports

must be protected from solder splash and flux during

soldering. The characteristics of selective soldering

machines vary, so any soldering setup must be tested

before production use.

2.3

Conversion to Physical Values

In order to obtain the measured flow in [slm], the

measured value needs to be converted using the following

formula:

Please note that the first measurement performed directly

after chip initialization is not valid.

Positive flow direction

(as marked on the sensor body)

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