ILPS22QSTR datasheet(40/57 Pages) STMICROELECTRONICS

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9.8

CTRL_REG3 (12h)

Control register 3 (R/W)

AH_QVAR_EN

AH_QVAR_

P_AUTO_EN

IF_ADD_INC

AH_QVAR_EN

Enables AH (analog hub) / Qvar functions. Default value: 0

(0: disable; 1: enable)

AH_QVAR_P_AUTO_EN

Enables AH/Qvar and pressure hardware interleaved mode. Default value: 0

(0: disable; 1: enable)

IF_ADD_INC

Default value: 1

(0: disable, 1: enable)

The AH_QVAR_EN bit enables the AH (analog hub) and Qvar functions. The network of external connections and

electrodes must be designed in the final application if these functions need to be enabled. Refer to Figure 15. AH

(analog hub) / Qvar external connections to pin 5, pin 7.

The AH_QVAR_P_AUTO_EN bit enables the interleaved hardware mode in which the device alternately

generates pressure data and AH / Qvar data. Before enabling this mode, the device must be configured in

power-down mode and the AH_QVAR_EN bit must be set to 0. This mode applies to both continuous and

one-shot mode. The least significant bit of the output data registers is set to 0 for pressure data and to 1 for

AH/Qvar data.

The IF_ADD_INC bit enables the address to be automatically incremented during a multiple byte access with a

serial interface (SPI or I²C).

ILPS22QS

CTRL_REG3 (12h)

DS13431 - Rev 3

page 40/57

ILPS22QSTR Datasheet(PDF) 40 Page - STMicroelectronics