www.sensirion.com v5 February 2013 4/10
2 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).
Formula: P = lfactor * (voltage
(1)
– 0.250)/3.750
(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
Formula: P = rfactor * (voltage
(1)
-0.250)^2
(1)
voltage: measured output voltage in Volt.
Figure 2: Linear output at 5
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
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
0 20 40 60 80 100
output voltage [V]
differential pressure [% full scale]
0.00
1.00
2.00
3.00
4.00
0 20 40 60 80 100
output voltage [V]
differential pressure [% full scale]
SDP1000-L / SDP2000-L
SDP1000-R / SDP2000-R
