ILPS22QSTR datasheet(24/57 Pages) STMICROELECTRONICS

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6.1

Analog hub (AH) / Qvar functions

The ILPS22QS embeds an analog hub sensing functionality which is able to connect an analog input and convert

it to a digital signal as output. In addition, Qvar sensing with external electrodes can be used for user interfaces

like water leakage detection, tap, double tap, long press, and L/R - R/L swipe.

Refer to application note AN5755 for additional details.

The input impedance between QVAR1 (pin 7) and QVAR2 (pin 5) of ILPS22QS depends on the AVG and ODR

configuration in Table 6. Input impedance of Qvar.

6.2

Power-saving tip for the pressure sensor, disabling the analog hub (AH) / Qvar

feature

The analog hub (AH) / Qvar feature is enabled by default and this feature causes slightly higher power

consumption during operating and power-down modes to support AH/Qvar functions. Thus, it is recommended to

use the following procedure to save power consumption in case the application doesn't need the AH/Qvar feature.

How to save power consumption? First of all, AH1/QVAR1 (pin 7) and AH2/QVAR2 (pin 5) must be connected

to GND on the PCB (hardware design). Second, the application must write 00h in the 5Fh register whenever the

application is powered on. Following this procedure, the device operates only in pressure sensor mode, disabling

AH/Qvar to achieve lower power consumption as described in Table 4. Electrical characteristics - pressure and

temperature.

6.3

Soldering information

The HLGA package is compliant with the ECOPACK standard and it is qualified for soldering heat resistance

according to JEDEC J-STD-020.

For land pattern and soldering recommendations, consult technical note TN0018 available on www.st.com.

ILPS22QS

Analog hub (AH) / Qvar functions

DS13431 - Rev 3

page 24/57

ILPS22QSTR 数据表(PDF) 24 Page - STMicroelectronics