SX9331EVKA datasheet(21/48 Pages) SEMTECH

21 / 48 page

SX9331

Final Datasheet

April 21, 2023

www.semtech.com

21 of 48

Rev. 2

Proprietary & Confidential

Semtech

3.6.2.Doze

In some applications, the reaction/sensing time needs to be fast when the user is present (proximity detected), but can

be slow when no detection has occurred for some time.

The Doze mode, when enabled (DOZEPERIOD), allows the chip to automatically switch between a fast scan period

(SCANPERIOD) during proximity detection (by any of the enabled phase) and a slow scan period (DOZEPERIOD)

when no proximity is detected. This enables lower average power consumption at the expense of longer reaction times.

After proximity is detected (by any of the enabled phases), the chip will automatically switch to Active mode. And

conversely when proximity is not detected anymore (by none of the enable phases), it will automatically switch to Doze

mode.

3.6.3.Sleep

Sleep mode can be entered by disabling all phases (PHEN=0). It places the chip in its lowest power mode, with scanning

completely disabled and idle period set to continuous. In this mode, only the I2C serial bus is active. Enabling any

phase (PHEN) and sending activation command will make the chip leave Sleep mode (for Doze if enabled, else Active

mode).

Additionally, Sleep mode can also be entered by using pause feature. But unlike using PHEN, exiting Sleep mode thru

unpause will not generate any compensation.

SX9331EVKA Datasheet(PDF) 21 Page - Semtech Corporation