LSM320HAY30 datasheet(16/42 Pages) STMICROELECTRONICS

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Functionality and terminology

LSM320HAY30

16/42

Doc ID 16917 Rev 1

4.5

Advanced features

4.5.1

Linear acceleration sensing

The LSM320HAY30 linear acceleration sensor includes a low-power mode characterized by

lower data rate refreshing. In this way the device, even when sleeping, continues sensing

acceleration and generating interrupt requests.

The “sleep-to-wakeup” function, in conjunction with low-power mode, allows further

reduction of system power consumption and the development of new smart applications.

When the sleep-to-wakeup function is activated,the LSM320HAY30 is able to automatically

wake up the linear acceleration sensor as soon as an interrupt event has been detected.

With this feature the system is efficiently switched from low-power mode to normal mode

based on user-selectable positioning and acceleration events, thus ensuring power-saving

and flexibility.

4.5.2

Angular rate sensing

Sleep mode, self-test and power-down

The LSM320HAY30 has advanced power-saving features for angular rate sensing thanks to

the availability of three different operating modes. When the device is set to sleep mode

configuration, the reading chain is completely turned off, resuting in low power consumption.

In this condition, the device turn-on time is significantly reduced, allowing simple external

power cycling.

Based on the table below, the user can select the desired operating mode using two

dedicated pins (ARST and ARPD).

High-pass filter reset (ARHP)

The LSM320HAY30 provides the possibility to reset the optional external high-pass filter by

applying a high logic value to the ARHP pad. This procedure ensures faster response,

especially during overload conditions. Moreover, this operation is recommended each time

the device is powered.

Table 5.

Angular rate sleep mode and power-down mode configuration

Operating mode

ARST pin

ARPD pin

Normal mode

Power-down

Self-test

Sleep mode

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