Data Sheet

11
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HTE501
TEMPERATURE HUMIDITY
bit Resolution [°C] Resolution [%RH]
14 0.01 0.01
13 0.01 0.02
12 0.02 0.04
11 0.06 0.09
10 0.11 0.18
9 0.21 0.35
8 0.42 0.69
Table 10: Measurement resolution
5 Interface
5.1 Pin Configuration, Assignment and Description
Please refer to chapter 1.
5.2 Supply Pins (V
DD
, GND)
The supply pins must be equipped with a bypass ceramic capacitor of at least 100nF.
When using the constant current heater, a current change in the heater must not lead to a voltage drop
below the minimum V
DD
value (refer to Table 6). This means the bypass capacitor needs to be dimensioned
sufficiently large so that the voltage controller is supplied adequately.
Sensor Power-up
As soon as V
DD
exceeds the POR voltage V
PORP
, the device gets initialized. After t
PWRU
, the initialization
procedure is completed and a single shot measurement is carried out automatically. After the measurement
time (t
T
+t
RH
+t
CALC
) the measured values are available at the I²C interface. The HI pin indicates the
availability of a valid temperature and humidity measurement after power-up (see pin description).
F:\proj\P\2016\P201607_EuE_ASIC_ASTR ID1\04_DOC\Berechnungen\PWRup_HIpin_Modi
t
CALC
HI\ pin
Voltage
V
DD
3.3V
V
PORP
0V
t
PWRU
t
T
t
MEAS
0V
IDLE MODE
Time
Time
Automatic measurement at power-up
t
RH
UNDEFINED
HIGH‐ZLOW
20.09.2021
HI
Figure 7: Sensor behaviour at power-up