SDP1000-R datasheet(4/10 Pages) ETC2

4 / 10 page

www.sensirion.com

v5 February 2013

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Electrical Specifications

2.1 Power Supply

The SDP1000 / SDP2000 differential pressure

sensors require a stable voltage supply of 5 V.

Influence of the supply voltage variation on the offset

and the sensitivity are given in Table 5.

2.2 Voltage Output

The SDP1000 / SDP2000 features a voltage output

from 0.25 V to 4.0 V (Figure 2, 3). An output voltage

below 0.25 V indicates a negative differential

pressure. This range is not calibrated however.

Exempt from this statement is the SDP1000-L025,

which features a fully bidirectional calibration with 0.2

to 4.0 V output.

The resistive load at the output pin should be larger

than 20 kOhm. The capacitive load at the output pin

must not be larger than 200 pF. If the design shows a

larger capacity at the output pin an additional resistor

is required in series at the output (e.g. 620 Ohm).

Linear output

Formula: P = lfactor * (voltage(1) – 0.250)/3.750

lfactor =

SDP1000-L05 SDP1000-L

SDP2000-L

Pascal

125

500

3500

Inch water

0.5

(1) voltage: measured output voltage in Volt.

For bi-directional SDP1000-L025

Formular: P=lfactor * (voltage – 2.10)/1.90

lfactor = 62 Pa or 0.25 Inch water

Square Root output

Formula: P = rfactor * (voltage(1) -0.250)^2

rfactor =

SDP1000-R

Pascal

35.55556

Inch water

0.14222

(1) voltage: measured output voltage in Volt.

Figure 2: Linear output at 5 Vdc supply of the SDP1000-L

and the SDP2000-L. The fine lines indicate the

maximum tolerances including a temperature

variation from 0 to 50°C.

Figure 3: Square root extracted output of the SDP1000-R

and the SDP2000-R at 5 Vdc supply. The fine lines

indicate the maximum tolerances including a

temperature variation from 0 to 50°C

0.00

1.00

2.00

3.00

4.00

100

differential pressure [% full scale]

0.00

1.00

2.00

3.00

4.00

100

differential pressure [% full scale]

SDP1000-L / SDP2000-L

SDP1000-R / SDP2000-R

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