Datasheet

www.sensirion.com
Version 1.0 – July 2020 – D1
5/19
2 Specifications
2.1 Electrical Specifications
Table 2 lists electrical specifications of the SGP40. Default conditions of 25 °C and 3.3 V supply voltage apply to values in the
table below, unless otherwise stated. The SGP40 supports both I
2
C “standard-mode” and “fast-mode”.
9
Parameter
Symbol
Values
Unit
Comments
Min.
Typ.
Max.
Supply voltage, hotplate supply
voltage
10
V
DD
,
V
DDH
1.7
3.3
3.6
V
Minimal voltage must be guaranteed also for the
maximum supply current specified in this table.
V
DD
and V
DDH
must be connected to the same
power supply, see Figure 5.
Idle current
I
DD
–
34
105
A
The idle mode is activated after power-up, after
calling the sgp40_heater_off command, or after
a soft reset.
Supply current under operation
11
–
3.5
4.0
mA
Average current consumption while the sensor
is continuously operated at V
DD
, V
DDH
= 1.8 V.
–
2.6
3.0
mA
Average current consumption while the sensor
is continuously operated at V
DD
, V
DDH
= 3.3 V.
Communication
–
Digital 2-wire interface, I
2
C
Table 2 Electrical specifications.
2.2 Timing Specifications
Timings in Table 3 refer to the power up and reset of the ASIC part and do not reflect the usefulness of the readings.
Parameter
Symbol
Condition
Min.
Typ.
Max.
Unit
Power-up time
t
PU
After hard reset, V
DD
≥ V
POR
–
0.4
0.6
ms
Soft reset time
t
SR
After soft reset
–
0.4
0.6
ms
SCL clock frequency
f
SCL
–
–
–
400
kHz
Table 3 System timing specifications.
2.3 Recommended Operating and Storage Conditions
Gas Sensing Specifications as detailed in Table 1 are guaranteed only when the sensor is stored and operated under the
recommended conditions as specified in Table 4 and displayed in Figure 3 and Figure 4. Prolonged exposure to conditions
outside these conditions may reduce sensor performance. The sensor must not be exposed towards condensing conditions (i.e.,
>90 % relative humidity) at any time.
9
http://www.nxp.com/documents/user_manual/UM10204.pdf
10
Any supply voltage as defined by the min./max. range may be used for continuous operation of the sensor. The typical value specifies the supply voltage at which outgoing
quality control is performed.
11
Sending the sgp40_measure_raw command enables continuous operation of the sensor. A 20 % higher current is drawn during 5 ms on V
DDH
after entering the measurement
mode.