linear accelerometer. AN2335 Datasheet

AN2335 accelerometer. Datasheet pdf. Equivalent


Part AN2335
Description digital output ultracompact linear accelerometer
Feature www.DataSheet4U.com AN2335 Application note LIS302DL: 3-Axis - ±2g/±8g digital output ultracompact .
Manufacture ST Microelectronics
Datasheet
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AN2335
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AN2335
Application note
LIS302DL: 3-Axis - ±2g/±8g digital output
ultracompact linear accelerometer
Introduction
This document is intended to give application notes for the low-voltage 3-axis digital output
linear MEMS accelerometer provided in LGA package.
The LIS302DL is an ultra compact low-power three axes linear accelerometer that includes
a sensing element and an IC interface able to take the information from the sensing element
and to provide the measured acceleration to the external world through I2C/SPI serial
interface.
The sensing element, capable of detecting the acceleration, is manufactured using a
dedicated process developed by ST to produce inertial sensors and actuators in silicon.
The IC interface instead is manufactured using a CMOS process that allows high level of
integration to design a dedicated circuit which is factory trimmed to better match the sensing
element characteristics.
The LIS302DL has a user selectable full scale of ±2g, ±8g and it is capable of measuring
accelerations with an output data rate of 100Hz or 400Hz. A self-test capability allows the
user to check the correct operation of the system.
The device features two independent highly programmable interrupt sources that can be
configured either to generate an inertial wake-up interrupt signal when a programmable
acceleration threshold is exceeded along one of the three axes or to detect a free-fall event.
Two independent pins can be configured to provide interrupt signals to connected devices.
The LIS302DL is available in plastic SMD package and it is specified over a temperature
range extending from -40°C to +85°C.
The ultra small size and weight of this package make it an ideal choice for handheld portable
applications such as cell phones and PDAs or any other application where reduced package
size and weight are required.
October 2006
Rev 2
1/40
www.st.com



AN2335
Contents
Contents
AN2335
1 Theory of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Electrical connection and board layout hints . . . . . . . . . . . . . . . . . . . . . 7
2.1 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Soldering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Digital interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 I2C Bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1.1 I2C Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1.2 I2C Subsequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 SPI bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2.1 Read & write protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2.2 SPI read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2.3 SPI Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2.4 SPI Read in 3-wires mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5 Registers description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1 Registers address map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1.1 Reserved Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1.2 Registers loaded at Boot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6 About control registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.1 CTRL_REG1 (20h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.2 CTRL_REG2 (21h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.3 CTRL_REG3 (22h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7 Data and status registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.1 WHO_AM_I (0Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.2 STATUS_REG (27h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.3 OUTX (29h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.4 OUTY (2Bh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
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