ILPS22QSTR datasheet(23/57 Pages) STMICROELECTRONICS

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The device power supply must be provided through the VDD line; a power supply decoupling capacitor C1

(100 nF) must be placed as near as possible to the supply pins of the device. The C1 capacitor can be tied to

VDD and Vdd_IO, but it is recommended to use 2 capacitors, one on each VDD and Vdd_IO line, in case VDD

are Vdd_IO are separate. Depending on the application, an additional capacitor of 4.7 µF could be placed on the

VDD line.

If AH (analog hub) / Qvar is not used, it is recommended to connect both pin 5 and pin 7 to GND.

If AH (analog hub) / Qvar is used, an external network is needed as described in Figure 15. AH (analog hub) /

Qvar external connections to pin 5, pin 7.

The functionality of the device and the measured data outputs are selectable and accessible through the I²C, MIPI

I3CSM, SPI interface. When using the I²C and MIPI I3CSM, CS must be tied to Vdd_IO.

All the voltage and ground supplies must be present at the same time to have proper behavior of the IC (refer

to Figure 14). It is possible to remove VDD while maintaining Vdd_IO without blocking the communication bus, in

this condition the measurement chain is powered off.

Note:

To guarantee proper power-off of the device, it is recommended to maintain the duration of the VDD line to GND

for at least 10 ms.

Figure 16. ILPS22QS power-off sequence

VDD

Time



VDD rising / falling time: 10 µs ~ 100 ms



VDD must be lower than 0.7 V for at least 10 ms during power-off sequence for correct POR

0.7 V

Min.10 ms

ILPS22QS

Application hints

DS13431 - Rev 3

page 23/57

ILPS22QSTR 数据表(PDF) 23 Page - STMicroelectronics