LIS2DUXS12 datasheet(15/104 Pages) STMICROELECTRONICS

Part #	LIS2DUXS12

Description	Ultralow-power accelerometer with Qvar, AI, & anti-aliasing

PDF	104 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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15 / 104 page

3.8

Qvar functionality

The LIS2DUXS12 embeds a Qvar sensor which is able to detect electric charge variations in the proximity of the

external electrodes connected to the device.

In the LIS2DUXS12, Qvar has a dedicated channel that can be activated by setting the AH_QVAR_EN bit to 1 in

the AH_QVAR_CFG (31h) register.

The AH_QVAR_NOTCH_EN bit and the AH_QVAR_NOTCH_CUTOFF bit in the AH_QVAR_CFG (31h) register

are used, respectively, to enable/disable the embedded digital notch filter and to set the cut-off frequency of this

filter (50 Hz or 60 Hz).

Qvar data are available as two's complement data, left-justified in 12-bit mode in the OUT_T_AH_QVAR_L

(2Eh) and OUT_T_AH_QVAR_H (2Fh) registers and are generated at the same rate as the one set for the

accelerometer sensor through the ODR[3:0] bits in register CTRL5 (14h).

Qvar data can also be processed by MLC/FSM logic.

LIS2DUXS12

Qvar functionality

DS14035 - Rev 2

page 15/104

LIS2DUXS12 Datasheet(PDF) 15 Page - STMicroelectronics