STMicroelectronics LIS302DLHTR Mems digital output motion sensor ultra low-power high performance 3-axes â piccoloâ accelerometer Datasheet

LIS302DLH
MEMS digital output motion sensor
ultra low-power high performance 3-axes “piccolo” accelerometer
Features
■
Wide supply voltage, 2.16 V to 3.6 V
■
Low voltage compatible IOs, 1.8 V
■
Ultra thickness 0.8 mm
■
Ultra low-power mode consumption
down to 10 µA
■
±2g/±4g/±8g dynamically selectable full-scale
■
I2C/SPI digital output interface
■
16 bit data output
■
2 independent programmable interrupt
generators for free-fall and motion detection
■
Sleep to wake-up function
■
6D orientation detection
■
Embedded self-test
■
10000 g high shock survivability
■
ECOPACK® RoHS and “Green” compliant (see
Section 8)
LGA-14 (3x5x0.8mm)
Description
The device features ultra low-power operational
modes that allow advanced power saving and
smart sleep to wake-up functions.
Applications
The LIS302DLH has dynamically user selectable
full scales of ±2g/±4g/±8g and it is capable of
measuring accelerations with output data rates
from 0.5 Hz to 1 kHz.
The self-test capability allows the user to check
the functioning of the sensor in the final
application.
■
Motion activated functions
■
Free-fall detection
■
Intelligent power saving for handheld devices
■
Pedometer
■
Display orientation
■
Gaming and virtual reality input devices
■
Impact recognition and logging
■
Vibration monitoring and compensation
Table 1.
The LIS302DLH is an ultra low-power high
performance three axes linear accelerometer
belonging to the “piccolo” family, with digital
I2C/SPI serial interface standard output.
The device may be configured to generate
interrupt signal by inertial wake-up/free-fall events
as well as by the position of the device itself.
Thresholds and timing of interrupt generators are
programmable by the end user on the fly.
The LIS302DLH is available in small thin plastic
land grid array package (LGA) and it is
guaranteed to operate over an extended
temperature range from -40 °C to +85 °C.
Device summary
Order codes
Temperature range [° C]
Package
Packaging
LIS302DLH
-40 to +85
LGA-14
Tray
LIS302DLHTR
-40 to +85
LGA-14
Tape and reel
June 2009
Doc ID 15797 Rev 1
1/37
www.st.com
37
Contents
LIS302DLH
Contents
1
2
3
4
Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Mechanical and electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1
Mechanical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3
Communication interface characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 11
SPI - serial peripheral interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.3.2
I2C - Inter IC control interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.4
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.5
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.5.1
Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.5.2
Zero-g level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.5.3
Self-test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.5.4
Sleep to wake-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1
Sensing element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.2
IC interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.3
Factory calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1
5
2.3.1
Soldering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Digital interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1
I2C serial interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1.1
5.2
2/37
I2C operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SPI bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2.1
SPI read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2.2
SPI write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.2.3
SPI read in 3-wires mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Doc ID 15797 Rev 1
LIS302DLH
Contents
6
Register mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7
Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.1
WHO_AM_I (0Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.2
CTRL_REG1 (20h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.3
CTRL_REG2 (21h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.4
CTRL_REG3 [Interrupt CTRL register] (22h) . . . . . . . . . . . . . . . . . . . . . . 27
7.5
CTRL_REG4 (23h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.6
CTRL_REG5 (24h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.7
HP_FILTER_RESET (25h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.8
REFERENCE (26h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.9
STATUS_REG (27h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.10
OUT_X_L (28h), OUT_X_H (29h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.11
OUT_Y_L (2Ah), OUT_Y_H (2Bh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.12
OUT_Z_L (2Ch), OUT_Z_H (2Dh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.13
INT1_CFG (30h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.14
INT1_SRC (31h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.15
INT1_THS (32h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.16
INT1_DURATION (33h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.17
INT2_CFG (34h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.18
INT2_SRC (35h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7.19
INT2_THS (36h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.20
INT2_DURATION (37h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Doc ID 15797 Rev 1
3/37
List of tables
LIS302DLH
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Table 15.
Table 16.
Table 17.
Table 18.
Table 19.
Table 20.
Table 21.
Table 22.
Table 23.
Table 24.
Table 25.
Table 26.
Table 27.
Table 28.
Table 29.
Table 30.
Table 31.
Table 32.
Table 33.
Table 34.
Table 35.
Table 36.
Table 37.
Table 38.
Table 39.
Table 40.
Table 41.
Table 42.
Table 43.
Table 44.
Table 45.
Table 46.
Table 48.
Table 47.
4/37
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Mechanical characteristics @ Vdd = 2.5 V, T = 25 °C unless otherwise noted . . . . . . . . . . 6
Electrical characteristics @ Vdd = 2.5 V, T = 25 °C unless otherwise noted . . . . . . . . . . . . 7
SPI slave timing values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
I2C slave timing values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Serial interface pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Serial interface pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
SAD+Read/Write patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Transfer when master is writing one byte to slave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Transfer when master is writing multiple bytes to slave:. . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Transfer when master is receiving (reading) one byte of data from slave: . . . . . . . . . . . . . 16
Transfer when Master is receiving (reading) multiple bytes of data from slave . . . . . . . . . 16
Register address map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
WHO_AM_I register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
CTRL_REG1 register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
CTRL_REG1 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Power mode and low-power output data rate configurations . . . . . . . . . . . . . . . . . . . . . . . 22
Normal-mode output data rate configurations and low-pass cut-off frequencies . . . . . . . . 22
CTRL_REG2 register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
CTRL_REG2 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
High-pass filter mode configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
High-pass filter cut-off frequency configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
CTRL_REG3 register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
CTRL_REG3 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Data signal on INT 1 and INT 2 pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
CTRL_REG4 register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
CTRL_REG4 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
CTRL_REG5 register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
CTRL_REG5 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Sleep to wake configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
REFERENCE register. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
REFERENCE description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
STATUS_REG register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
STATUS_REG description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
INT1_CFG register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
INT1_CFG description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Interrupt 1 source configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
INT1_SRC register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
INT1_SRC description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
INT1_THS register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
INT1_THS description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
INT1_DURATION register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
INT1_DURATION description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
INT2_CFG register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Interrupt mode configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
INT2_CFG description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Doc ID 15797 Rev 1
LIS302DLH
Table 49.
Table 50.
Table 51.
Table 52.
Table 53.
Table 54.
Table 55.
List of tables
INT2_SRC register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
INT2_SRC description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
INT2_THS register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
INT2_THS description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
INT2_DURATION register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
INT2_DURATION description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Doc ID 15797 Rev 1
5/37
List of figures
LIS302DLH
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
6/37
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SPI slave timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
I2C Slave timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
LIS302DLH electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Read and write protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SPI read protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Multiple bytes SPI read protocol (2 bytes example) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SPI write protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Multiple bytes SPI write protocol (2 bytes example) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SPI read protocol in 3-wires mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
LGA-14: mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Doc ID 15797 Rev 1
LIS302DLH
Block diagram and pin description
1
Block diagram and pin description
1.1
Block diagram
Figure 1.
Block diagram
X+
CHARGE
AMPLIFIER
Y+
Z+
a
CS
A/D
CONVERTER
MUX
SCL/SPC
I2C
CONTROL LOGIC
SDA/SDO/SDI
SPI
Z-
SDO/SA0
YX-
SELF TEST
1.2
TRIMMING
CIRCUITS
REFERENCE
CLOCK
CONTROL LOGIC
&
INTERRUPT GEN.
INT 1
INT 2
Pin description
Figure 2.
Pin connection
Z
1
1
6
13
8
X
Y
13
6
8
BOTTOM VIEW
TOP VIEW
Doc ID 15797 Rev 1
7/37
Block diagram and pin description
Table 2.
8/37
LIS302DLH
Pin description
Pin#
Name
Function
1
Vdd_IO
2
GND
3
Reserved
4
GND
0V supply
5
GND
0V supply
6
Vdd
Power supply
7
CS
SPI enable
I2C/SPI mode selection (1: I2C mode; 0: SPI enabled)
8
INT1
Inertial interrupt 1
9
INT2
Inertial interrupt 2
10
GND
0V supply
11
Reserved
12
SDO
SPI serial data output
I2C less significant bit of the device address
13
SDA
SDI
SDO
I2C serial data (SDA)
SPI serial data input (SDI)
3-wire interface serial data output (SDO)
14
SCL
SPC
I2C serial clock (SCL)
SPI serial port clock (SPC)
Power supply for I/O pins
0V supply
Connect to Vdd
Connect to Gnd
Doc ID 15797 Rev 1
LIS302DLH
Mechanical and electrical specifications
2
Mechanical and electrical specifications
2.1
Mechanical characteristics
Table 3.
Mechanical characteristics @ Vdd = 2.5 V, T = 25 °C unless otherwise noted (1)
Symbol
FS
So
Parameter
Measurement
range(3)
Sensitivity
Test conditions
Min.
Typ.(2)
FS bit set to 00
±2.0
FS bit set to 01
±4.0
FS bit set to 11
±8.0
Max.
Unit
g
FS bit set to 00
12 bit representation
0.9
1
1.1
FS bit set to 01
12 bit representation
1.8
2
2.2
FS bit set to 11
12 bit representation
3.5
3.9
4.3
mg/digit
TCSo
Sensitivity change vs
temperature
FS bit set to 00
±0.01
%/°C
TyOff
Typical zero-g level offset
accuracy(4),(5)
FS bit set to 00
±20
mg
TCOff
Zero-g level change vs
temperature
Max delta from 25 °C
±0.1
mg/°C
Acceleration noise density
FS bit set to 00
218
µg/ Hz
An
Vst
Self-test
output change(6),(7),(8)
Top
Operating temperature range
Wh
Product weight
FS bit set to 00
X axis
120
300
550
LSb
FS bit set to 00
Y axis
120
300
550
LSb
FS bit set to 00
Z axis
140
350
750
LSb
+85
°C
-40
20
mgram
1. The product is factory calibrated at 2.5 V. The operational power supply range is from 2.16 V to 3.6 V.
2. Typical specifications are not guaranteed
3. Verified by wafer level test and measurement of initial offset and sensitivity
4. Typical zero-g level offset value after MSL3 preconditioning
5. Offset can be eliminated by enabling the built-in high pass filter
6. The sign of “Self-test output change” is defined by CTRL_REG4 STsign bit (Table 28), for all axes.
7. Self-test output changes with the power supply. “Self-test output change” is defined as
OUTPUT[LSb](CTRL_REG4 ST bit=1) - OUTPUT[LSb](CTRL_REG4 ST bit=0). 1LSb=4g/4096 at 12bit representation, ±2 g Full-scale
8. Output data reach 99% of final value after 3/ODR when enabling self-test mode, due to device filtering
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Mechanical and electrical specifications
LIS302DLH
2.2
Electrical characteristics
Table 4.
Electrical characteristics @ Vdd = 2.5 V, T = 25 °C unless otherwise noted (1)
Symbol
Vdd
Vdd_IO
Parameter
Test conditions
Supply voltage
(3)
I/O pins supply voltage
Min.
Typ.(2)
Max.
Unit
2.16
2.5
3.6
V
Vdd+0.1
V
1.71
Idd
Current consumption
in normal mode
250
µA
IddLP
Current consumption
in low-power mode
10
µA
IddPdn
Current consumption in
power-down mode
1
µA
VIH
Digital high level input
voltage
VIL
Digital low level input voltage
VOH
High level output voltage
VOL
Low level output voltage
ODR
ODRLP
BW
Output data rate
in normal mode
Output data rate
in low-power mode
0.8*Vdd_IO
0.2*Vdd_IO
0.9*Vdd_IO
Ton
Turn-on
Top
Operating temperature range
DR bit set to 00
50
DR bit set to 01
100
DR bit set to 10
400
DR bit set to 11
1000
V
Hz
PM bit set to 010
0.5
PM bit set to 011
1
PM bit set to 100
2
PM bit set to 101
5
PM bit set to 110
10
ODR = 100 Hz
Hz
ODR/2
Hz
3/ODR
s
-40
+85
1. The product is factory calibrated at 2.5 V. The operational power supply range is from 2.16 V to 3.6 V.
2. Typical specification are not guaranteed
3. It is possible to remove Vdd maintaining Vdd_IO without blocking the communication busses, in this condition the
measurement chain is powered off.
4. Refer to Table 20 for filter cut-off frequency
5. Time to obtain valid data after exiting power-down mode
10/37
V
V
0.1*Vdd_IO
System bandwidth(4)
time(5)
V
Doc ID 15797 Rev 1
°C
LIS302DLH
Mechanical and electrical specifications
2.3
Communication interface characteristics
2.3.1
SPI - serial peripheral interface
Subject to general operating conditions for Vdd and Top.
Table 5.
SPI slave timing values
Value (1)
Symbol
Parameter
Unit
Min.
tc(SPC)
SPI clock cycle
fc(SPC)
SPI clock frequency
tsu(CS)
CS setup time
5
th(CS)
CS hold time
8
tsu(SI)
SDI input setup time
5
th(SI)
SDI input hold time
15
tv(SO)
SDO valid output time
th(SO)
SDO output hold time
tdis(SO)
Max.
100
ns
10
MHz
ns
50
6
SDO output disable time
50
1. Values are guaranteed at 10 MHz clock frequency for SPI with both 4 and 3 wires, based on characterization results, not
tested in production
Figure 3.
CS
SPI slave timing diagram (a)
(3)
(3)
tc(SPC)
tsu(CS)
SPC
(3)
(3)
tsu(SI)
SDI
(3)
th(SI)
LSB IN
MSB IN
tv(SO)
SDO
th(CS)
(3)
MSB OUT
(3)
tdis(SO)
th(SO)
LSB OUT
(3)
3. When no communication is on-going, data on CS, SPC, SDI and SDO are driven by internal pull-up
resistors
a. Measurement points are done at 0.2·Vdd_IO and 0.8·Vdd_IO, for both input and output port
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Mechanical and electrical specifications
2.3.2
LIS302DLH
I2C - Inter IC control interface
Subject to general operating conditions for Vdd and top.
Table 6.
I2C slave timing values
I2C standard mode (1)
Symbol
I2C fast mode (1)
Parameter
f(SCL)
Unit
SCL clock frequency
Min.
Max.
Min.
Max.
0
100
0
400
tw(SCLL)
SCL clock low time
4.7
1.3
tw(SCLH)
SCL clock high time
4.0
0.6
tsu(SDA)
SDA setup time
250
100
th(SDA)
SDA data hold time
0.01
KHz
µs
ns
3.45
0.01
0.9
tr(SDA) tr(SCL)
SDA and SCL rise time
1000
20 + 0.1Cb (2)
300
tf(SDA) tf(SCL)
SDA and SCL fall time
300
20 + 0.1Cb (2)
300
th(ST)
START condition hold time
4
0.6
tsu(SR)
Repeated START condition
setup time
4.7
0.6
tsu(SP)
STOP condition setup time
4
0.6
4.7
1.3
µs
ns
µs
tw(SP:SR)
Bus free time between STOP
and START condition
1. Data based on standard I2C protocol requirement, not tested in production
2. Cb = total capacitance of one bus line, in pF
Figure 4.
I2C Slave timing diagram (b)
REPEATED
START
START
tsu(SR)
tw(SP:SR)
SDA
tf(SDA)
tsu(SDA)
tr(SDA)
th(SDA)
tsu(SP)
SCL
th(ST)
tw(SCLL)
tw(SCLH)
tr(SCL)
tf(SCL)
b. Measurement points are done at 0.2·Vdd_IO and 0.8·Vdd_IO, for both port
12/37
START
Doc ID 15797 Rev 1
STOP
LIS302DLH
2.4
Mechanical and electrical specifications
Absolute maximum ratings
Stresses above those listed as “absolute maximum ratings” may cause permanent damage
to the device. This is a stress rating only and functional operation of the device under these
conditions is not implied. Exposure to maximum rating conditions for extended periods may
affect device reliability.
Table 7.
Absolute maximum ratings
Symbol
Vdd
Vdd_IO
Vin
Ratings
Maximum value
Unit
Supply voltage
-0.3 to 6
V
I/O pins Supply voltage
-0.3 to 6
V
-0.3 to Vdd_IO +0.3
V
Input voltage on any control pin
(CS, SCL/SPC, SDA/SDI/SDO, SDO/SA0)
3000 g for 0.5 ms
APOW
Acceleration (any axis, powered, Vdd = 2.5 V)
AUNP
Acceleration (any axis, unpowered)
TOP
Operating temperature range
-40 to +85
°C
TSTG
Storage temperature range
-40 to +125
°C
4 (HBM)
kV
1.5 (CDM)
kV
200 (MM)
V
10000 g for 0.1 ms
3000 g for 0.5 ms
ESD
Note:
Electrostatic discharge protection
10000 g for 0.1 ms
Supply voltage on any pin should never exceed 6.0 V
This is a mechanical shock sensitive device, improper handling can cause permanent
damages to the part
This is an ESD sensitive device, improper handling can cause permanent damages to
the part
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Mechanical and electrical specifications
2.5
Terminology
2.5.1
Sensitivity
LIS302DLH
Sensitivity describes the gain of the sensor and can be determined e.g. by applying 1 g
acceleration to it. As the sensor can measure DC accelerations this can be done easily by
pointing the axis of interest towards the center of the earth, noting the output value, rotating
the sensor by 180 degrees (pointing to the sky) and noting the output value again. By doing
so, ±1 g acceleration is applied to the sensor. Subtracting the larger output value from the
smaller one, and dividing the result by 2, leads to the actual sensitivity of the sensor. This
value changes very little over temperature and also time. The sensitivity tolerance describes
the range of Sensitivities of a large population of sensors.
2.5.2
Zero-g level
Zero-g level offset (TyOff) describes the deviation of an actual output signal from the ideal
output signal if no acceleration is present. A sensor in a steady state on a horizontal surface
will measure 0 g in X axis and 0 g in Y axis whereas the Z axis will measure 1 g. The output
is ideally in the middle of the dynamic range of the sensor (content of OUT registers 00h,
data expressed as 2’s complement number). A deviation from ideal value in this case is
called Zero-g offset. Offset is to some extent a result of stress to MEMS sensor and
therefore the offset can slightly change after mounting the sensor onto a printed circuit
board or exposing it to extensive mechanical stress. Offset changes little over temperature,
see “Zero-g level change vs. temperature”. The Zero-g level tolerance (TyOff) describes the
standard deviation of the range of Zero-g levels of a population of sensors.
2.5.3
Self-test
Self-test allows to check the sensor functionality without moving it. The self-test function is
off when the self-test bit (ST) of CTRL_REG4 (control register 4) is programmed to ‘0‘.
When the self-test bit of CTRL_REG4 is programmed to ‘1‘ an actuation force is applied to
the sensor, simulating a definite input acceleration. In this case the sensor outputs will
exhibit a change in their DC levels which are related to the selected full scale through the
device sensitivity. When self-test is activated, the device output level is given by the
algebraic sum of the signals produced by the acceleration acting on the sensor and by the
electrostatic test-force. If the output signals change within the amplitude specified inside
Table 3, then the sensor is working properly and the parameters of the interface chip are
within the defined specifications.
2.5.4
Sleep to wake-up
The “sleep to wake-up” function, in conjunction with low-power mode, allows to further
reduce the system power consumption and develop new smart applications.
LIS302DLH may be set in a low-power operating mode, characterized by lower date rates
refreshments. In this way the device, even if sleeping, keep on sensing acceleration and
generating interrupt requests.
When the “sleep to wake-up” function is activated, LIS302DLH is able to automatically
wake-up as soon as the interrupt event has been detected, increasing the output data rate
and bandwidth.
With this feature the system may be efficiently switched from low-power mode to fullperformance depending on user-selectable positioning and acceleration events, thus
ensuring power saving and flexibility.
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LIS302DLH
3
Functionality
Functionality
The LIS302DLH is a nano, low-power, digital output 3-axis linear accelerometer packaged in
a LGA package. The complete device includes a sensing element and an IC interface able
to take the information from the sensing element and to provide a signal to the external
world through an I2C/SPI serial interface.
3.1
Sensing element
A proprietary process is used to create a surface micro-machined accelerometer. The
technology allows to carry out suspended silicon structures which are attached to the
substrate in a few points called anchors and are free to move in the direction of the sensed
acceleration. To be compatible with the traditional packaging techniques a cap is placed on
top of the sensing element to avoid blocking the moving parts during the moulding phase of
the plastic encapsulation.
When an acceleration is applied to the sensor the proof mass displaces from its nominal
position, causing an imbalance in the capacitive half-bridge. This imbalance is measured
using charge integration in response to a voltage pulse applied to the capacitor.
At steady state the nominal value of the capacitors are few pF and when an acceleration is
applied the maximum variation of the capacitive load is in the fF range.
3.2
IC interface
The complete measurement chain is composed by a low-noise capacitive amplifier which
converts the capacitive unbalancing of the MEMS sensor into an analog voltage that is
finally available to the user by an analog-to-digital converter.
The acceleration data may be accessed through an I2C/SPI interface thus making the
device particularly suitable for direct interfacing with a microcontroller.
The LIS302DLH features a Data-Ready signal (RDY) which indicates when a new set of
measured acceleration data is available thus simplifying data synchronization in the digital
system that uses the device.
The LIS302DLH may also be configured to generate an inertial Wake-Up and Free-Fall
interrupt signal accordingly to a programmed acceleration event along the enabled axes.
Both Free-Fall and Wake-Up can be available simultaneously on two different pins.
3.3
Factory calibration
The IC interface is factory calibrated for sensitivity (So) and Zero-g level (TyOff).
The trimming values are stored inside the device in a non volatile memory. Any time the
device is turned on, the trimming parameters are downloaded into the registers to be used
during the active operation. This allows to use the device without further calibration.
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Application hints
4
LIS302DLH
Application hints
Figure 5.
LIS302DLH electrical connection
Vdd
Vdd_IO
1
6
Z
1
X
Y
10uF
13
6
Top VIEW
8
8
DIRECTIONS OF THE
DETECTABLE
ACCELERATIONS
SCL/SPC
SDO
INT 2
INT 1
CS
TOP VIEW
13
SDA/SDI/SDO
100nF
GND
Digital signal from/to signal controller.Signal’s levels are defined by proper selection of Vdd_IO
The device core is supplied through Vdd line while the I/O pads are supplied through
Vdd_IO line. Power supply decoupling capacitors (100 nF ceramic, 10 µF Aluminum) should
be placed as near as possible to the pin 6 of the device (common design practice).
All the voltage and ground supplies must be present at the same time to have proper
behavior of the IC (refer to Figure 5). It is possible to remove Vdd maintaining Vdd_IO
without blocking the communication bus, in this condition the measurement chain is
powered off.
The functionality of the device and the measured acceleration data is selectable and
accessible through the I2C/SPI interface.When using the I2C, CS must be tied high.
The functions, the threshold and the timing of the two interrupt pins (INT 1 and INT 2) can be
completely programmed by the user through the I2C/SPI interface.
4.1
Soldering information
The LGA package is compliant with the ECOPACK®, RoHS and “Green” standard.
It is qualified for soldering heat resistance according to JEDEC J-STD-020C.
Leave “Pin 1 Indicator” unconnected during soldering.
Land pattern and soldering recommendations are available at www.st.com.
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LIS302DLH
5
Digital interfaces
Digital interfaces
The registers embedded inside the LIS302DLH may be accessed through both the I2C and
SPI serial interfaces. The latter may be SW configured to operate either in 3-wire or 4-wire
interface mode.
The serial interfaces are mapped onto the same pads. To select/exploit the I2C interface, CS
line must be tied high (i.e. connected to Vdd_IO).
Table 8.
Serial interface pin description
Pin name
SPI enable
I2C/SPI mode selection (1: I2C mode; 0: SPI enabled)
CS
5.1
Pin description
SCL
SPC
I2C serial clock (SCL)
SPI serial port clock (SPC)
SDA
SDI
SDO
I2C serial data (SDA)
SPI serial data input (SDI)
3-wire interface serial data output (SDO)
SA0
SDO
I2C less significant bit of the device address (SA0)
SPI serial data output (SDO)
I2C serial interface
The LIS302DLH I2C is a bus slave. The I2C is employed to write data into registers whose
content can also be read back.
The relevant I2C terminology is given in the table below.
Table 9.
Serial interface pin description
Term
Transmitter
Receiver
Description
The device which sends data to the bus
The device which receives data from the bus
Master
The device which initiates a transfer, generates clock signals and terminates a
transfer
Slave
The device addressed by the master
There are two signals associated with the I2C bus: the serial clock line (SCL) and the Serial
DAta line (SDA). The latter is a bidirectional line used for sending and receiving the data
to/from the interface. Both the lines are connected to Vdd_IO through a pull-up resistor
embedded inside the LIS302DLH. When the bus is free both the lines are high.
The I2C interface is compliant with fast mode (400 kHz) I2C standards as well as with the
normal mode.
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Digital interfaces
5.1.1
LIS302DLH
I2C operation
The transaction on the bus is started through a START (ST) signal. A START condition is
defined as a HIGH to LOW transition on the data line while the SCL line is held HIGH. After
this has been transmitted by the Master, the bus is considered busy. The next byte of data
transmitted after the start condition contains the address of the slave in the first 7 bits and
the eighth bit tells whether the Master is receiving data from the slave or transmitting data to
the slave. When an address is sent, each device in the system compares the first seven bits
after a start condition with its address. If they match, the device considers itself addressed
by the Master.
The Slave ADdress (SAD) associated to the LIS302DLH is 001100xb. SDO/SA0 pad can be
used to modify less significant bit of the device address. If SA0 pad is connected to voltage
supply, LSb is ‘1’ (address 0011001b) else if SA0 pad is connected to ground, LSb value is
‘0’ (address 0011000b). This solution permits to connect and address two different
accelerometers to the same I2C lines.
Data transfer with acknowledge is mandatory. The transmitter must release the SDA line
during the acknowledge pulse. The receiver must then pull the data line LOW so that it
remains stable low during the HIGH period of the acknowledge clock pulse. A receiver which
has been addressed is obliged to generate an acknowledge after each byte of data
received.
The I2C embedded inside the LIS302DLH behaves like a slave device and the following
protocol must be adhered to. After the start condition (ST) a slave address is sent, once a
slave acknowledge (SAK) has been returned, a 8-bit sub-address (SUB) is transmitted: the
7 LSb represent the actual register address while the MSB enables address auto increment.
If the MSb of the SUB field is ‘1’, the SUB (register address) is automatically increased to
allow multiple data read/write.
The slave address is completed with a Read/Write bit. If the bit was ‘1’ (Read), a repeated
START (SR) condition must be issued after the two sub-address bytes; if the bit is ‘0’ (Write)
the Master will transmit to the slave with direction unchanged. Table 10 explains how the
SAD+Read/Write bit pattern is composed, listing all the possible configurations.
Table 10.
Command
SAD[6:1]
SAD[0] = SA0
R/W
Read
001100
0
1
00110001 (31h)
Write
001100
0
0
00110000 (30h)
Read
001100
1
1
00110011 (33h)
Write
001100
1
0
00110010 (32h)
Table 11.
Master
Slave
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SAD+Read/Write patterns
SAD+R/W
Transfer when master is writing one byte to slave
ST
SAD + W
SUB
SAK
Doc ID 15797 Rev 1
DATA
SAK
SP
SAK
LIS302DLH
Digital interfaces
Table 12.
Master
Transfer when master is writing multiple bytes to slave:
ST
SAD + W
Slave
SAK
Table 13.
Master
Master
Slave
DATA
DATA
SAK
SAK
SP
SAK
Transfer when master is receiving (reading) one byte of data from slave:
ST
SAD + W
Slave
Table 14.
SUB
SUB
SAK
SR
SAD + R
SAK
NMAK
SAK
SP
DATA
Transfer when Master is receiving (reading) multiple bytes of data from slave
ST SAD+W
SUB
SAK
SR SAD+R
SAK
MAK
SAK
DATA
MAK
DATA
NMAK
SP
DATA
Data are transmitted in byte format (DATA). Each data transfer contains 8 bits. The number
of bytes transferred per transfer is unlimited. Data is transferred with the Most Significant bit
(MSb) first. If a receiver can’t receive another complete byte of data until it has performed
some other function, it can hold the clock line, SCL LOW to force the transmitter into a wait
state. Data transfer only continues when the receiver is ready for another byte and releases
the data line. If a slave receiver doesn’t acknowledge the slave address (i.e. it is not able to
receive because it is performing some real time function) the data line must be left HIGH by
the slave. The Master can then abort the transfer. A LOW to HIGH transition on the SDA line
while the SCL line is HIGH is defined as a STOP condition. Each data transfer must be
terminated by the generation of a STOP (SP) condition.
In order to read multiple bytes, it is necessary to assert the most significant bit of the subaddress field. In other words, SUB(7) must be equal to 1 while SUB(6-0) represents the
address of first register to be read.
In the presented communication format MAK is Master acknowledge and NMAK is No
Master Acknowledge.
5.2
SPI bus interface
The LIS302DLH SPI is a bus slave. The SPI allows to write and read the registers of the
device.
The Serial Interface interacts with the outside world with 4 wires: CS, SPC, SDI and SDO.
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Digital interfaces
LIS302DLH
Figure 6.
Read and write protocol
CS
SPC
SDI
DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0
RW
MS AD5 AD4 AD3 AD2 AD1 AD0
SDO
DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0
CS is the serial port enable and it is controlled by the SPI master. It goes low at the start of
the transmission and goes back high at the end. SPC is the serial port clock and it is
controlled by the SPI master. It is stopped high when CS is high (no transmission). SDI and
SDO are respectively the serial port data input and output. Those lines are driven at the
falling edge of SPC and should be captured at the rising edge of SPC.
Both the read register and write register commands are completed in 16 clock pulses or in
multiple of 8 in case of multiple bytes read/write. Bit duration is the time between two falling
edges of SPC. The first bit (bit 0) starts at the first falling edge of SPC after the falling edge
of CS while the last bit (bit 15, bit 23, ...) starts at the last falling edge of SPC just before the
rising edge of CS.
bit 0: RW bit. When 0, the data DI(7:0) is written into the device. When 1, the data DO(7:0)
from the device is read. In latter case, the chip will drive SDO at the start of bit 8.
bit 1: MS bit. When 0, the address will remain unchanged in multiple read/write commands.
When 1, the address is auto incremented in multiple read/write commands.
bit 2-7: address AD(5:0). This is the address field of the indexed register.
bit 8-15: data DI(7:0) (write mode). This is the data that is written into the device (MSb first).
bit 8-15: data DO(7:0) (read mode). This is the data that is read from the device (MSb first).
In multiple read/write commands further blocks of 8 clock periods will be added. When MS
bit is ‘0’ the address used to read/write data remains the same for every block. When MS bit
is ‘1’ the address used to read/write data is increased at every block.
The function and the behavior of SDI and SDO remain unchanged.
5.2.1
SPI read
Figure 7.
SPI read protocol
CS
SPC
SDI
RW
MS AD5 AD4 AD3 AD2 AD1 AD0
SDO
DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0
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Doc ID 15797 Rev 1
LIS302DLH
Digital interfaces
The SPI Read command is performed with 16 clock pulses. Multiple byte read command is
performed adding blocks of 8 clock pulses at the previous one.
bit 0: READ bit. The value is 1.
bit 1: MS bit. When 0 do not increment address, when 1 increment address in multiple
reading.
bit 2-7: address AD(5:0). This is the address field of the indexed register.
bit 8-15: data DO(7:0) (read mode). This is the data that is read from the device (MSb first).
bit 16-... : data DO(...-8). Further data in multiple byte reading.
Figure 8.
Multiple bytes SPI read protocol (2 bytes example)
CS
SPC
SDI
RW
MS AD5 AD4 AD3 AD2 AD1 AD0
SDO
DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0 DO15DO14DO13DO12DO11DO10DO9 DO8
5.2.2
SPI write
Figure 9.
SPI write protocol
CS
SPC
SDI
DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0
RW
MS AD5 AD4 AD3 AD2 AD1 AD0
The SPI Write command is performed with 16 clock pulses. Multiple byte write command is
performed adding blocks of 8 clock pulses at the previous one.
bit 0: WRITE bit. The value is 0.
bit 1: MS bit. When 0 do not increment address, when 1 increment address in multiple
writing.
bit 2 -7: address AD(5:0). This is the address field of the indexed register.
bit 8-15: data DI(7:0) (write mode). This is the data that is written inside the device (MSb
first).
bit 16-... : data DI(...-8). Further data in multiple byte writing.
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Digital interfaces
LIS302DLH
Figure 10. Multiple bytes SPI write protocol (2 bytes example)
CS
SPC
SDI
DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0 DI15 DI14 DI13 DI12 DI11 DI10 DI9 DI8
RW
MS AD5 AD4 AD3 AD2 AD1 AD0
5.2.3
SPI read in 3-wires mode
3-wires mode is entered by setting to ‘1’ bit SIM (SPI serial interface mode selection) in
CTRL_REG4.
Figure 11. SPI read protocol in 3-wires mode
CS
SPC
SDI/O
DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0
RW
MS AD5 AD4 AD3 AD2 AD1 AD0
The SPI read command is performed with 16 clock pulses:
bit 0: READ bit. The value is 1.
bit 1: MS bit. When 0 do not increment address, when 1 increment address in multiple
reading.
bit 2-7: address AD(5:0). This is the address field of the indexed register.
bit 8-15: data DO(7:0) (read mode). This is the data that is read from the device (MSb first).
Multiple read command is also available in 3-wires mode.
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LIS302DLH
6
Register mapping
Register mapping
The table given below provides a listing of the 8 bit registers embedded in the device and
the related addresses:
Table 15.
Register address map
Register address
Name
Type
Default
Hex
Reserved (do not modify)
WHO_AM_I
00 - 0E
r
Reserved (do not modify)
0F
Reserved
000 1111 00110010 Dummy register
10 - 1F
Reserved
CTRL_REG1
rw
20
010 0000 00000111
CTRL_REG2
rw
21
010 0001 00000000
CTRL_REG3
rw
22
010 0010 00000000
CTRL_REG4
rw
23
010 0011 00000000
CTRL_REG5
rw
24
010 0100 00000000
r
25
010 0101
REFERENCE
rw
26
010 0110 00000000
STATUS_REG
r
27
010 0111 00000000
OUT_X_L
r
28
010 1000
output
OUT_X_H
r
29
010 1001
output
OUT_Y_L
r
2A
010 1010
output
OUT_Y_H
r
2B
010 1011
output
OUT_Z_L
r
2C
010 1100
output
OUT_Z_H
r
2D
010 1101
output
HP_FILTER_RESET
Reserved (do not modify)
INT1_CFG
Dummy register
2E - 2F
Reserved
rw
30
011 0000 00000000
r
31
011 0001 00000000
INT1_THS
rw
32
011 0010 00000000
INT1_DURATION
rw
33
011 0011 00000000
INT2_CFG
rw
34
011 0100 00000000
r
35
011 0101 00000000
INT2_THS
rw
36
011 0110 00000000
INT2_DURATION
rw
37
011 0111 00000000
INT1_SOURCE
INT2_SOURCE
Reserved (do not modify)
38 - 3F
Comment
Binary
Reserved
Registers marked as Reserved must not be changed. The writing to those registers may
cause permanent damages to the device.
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Register description
LIS302DLH
The content of the registers that are loaded at boot should not be changed. They contain the
factory calibration values. Their content is automatically restored when the device is
powered-up.
7
Register description
The device contains a set of registers which are used to control its behavior and to retrieve
acceleration data. The registers address, made of 7 bits, is used to identify them and to
write the data through serial interface.
7.1
WHO_AM_I (0Fh)
Table 16.
0
WHO_AM_I register
0
1
1
0
0
1
0
Device identification register.
This register contains the device identifier that for LIS302DLH is set to 32h.
7.2
CTRL_REG1 (20h)
Table 17.
PM2
Table 18.
CTRL_REG1 register
PM1
PM0
DR1
DR0
Zen
Yen
Xen
CTRL_REG1 description
PM2 - PM0
Power mode selection. Default value: 000
(000: Power-down; Others: refer to Table 19)
DR1, DR0
Data rate selection. Default value: 00
(00:50 Hz; Others: refer to Table 20)
Zen
Z axis enable. Default value: 1
(0: Z axis disabled; 1: Z axis enabled)
Yen
Y axis enable. Default value: 1
(0: Y axis disabled; 1: Y axis enabled)
Xen
X axis enable. Default value: 1
(0: X axis disabled; 1: X axis enabled)
PM bits allow to select between power-down and two operating active modes. The device is
in power-down mode when PD bits are set to “000” (default value after boot). Table 19
shows all the possible power mode configurations and respective output data rates. Output
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LIS302DLH
Register description
data in the low-power modes are computed with low-pass filter cut-off frequency defined by
DR1, DR0 bits.
DR bits, in the normal-mode operation, select the data rate at which acceleration samples
are produced. In low-power mode they define the output data resolution. Table 20 shows all
the possible configuration for DR1 and DR0 bits.
Table 19.
PM2
PM1
PM0
Power mode selection
Output data rate [Hz]
ODRLP
0
0
0
Power-down
--
0
0
1
Normal mode
ODR
0
1
0
Low-power
0.5
0
1
1
Low-power
1
1
0
0
Low-power
2
1
0
1
Low-power
5
1
1
0
Low-power
10
Table 20.
7.3
Power mode and low-power output data rate configurations
Normal-mode output data rate configurations and low-pass cut-off
frequencies
DR1
DR0
Output Data Rate [Hz]
ODR
Low-pass filter cut-off
frequency [Hz]
0
0
50
37
0
1
100
74
1
0
400
292
1
1
1000
780
CTRL_REG2 (21h)
Table 21.
CTRL_REG2 register
BOOT
Table 22.
HPM1
FDS
HPen2
HPen1
HPCF1
HPCF0
CTRL_REG2 description
BOOT
HPM1, HPM0
FDS
HPM0
Reboot memory content. Default value: 0
(0: normal mode; 1: reboot memory content)
High pass filter mode selection. Default value: 00
(00: normal mode; Others: refer to Table 23)
Filtered data selection. Default value: 0
(0: internal filter bypassed; 1: data from internal filter sent to output register)
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Register description
Table 22.
LIS302DLH
CTRL_REG2 description (continued)
HPen2
High pass filter enabled for interrupt 2 source. Default value: 0
(0: filter bypassed; 1: filter enabled)
HPen1
High pass filter enabled for interrupt 1 source. Default value: 0
(0: filter bypassed; 1: filter enabled)
HPCF1,
HPCF0
High pass filter cut-off frequency configuration. Default value: 00
(00: HPc=8; 01: HPc=16; 10: HPc=32; 11: HPc=64)
BOOT bit is used to refresh the content of internal registers stored in the flash memory
block. At the device power up the content of the flash memory block is transferred to the
internal registers related to trimming functions to permit a good behavior of the device itself.
If for any reason the content of trimming registers was changed it is sufficient to use this bit
to restore correct values. When BOOT bit is set to ‘1’ the content of internal flash is copied
inside corresponding internal registers and it is used to calibrate the device. These values
are factory trimmed and they are different for every accelerometer. They permit a good
behavior of the device and normally they have not to be changed. At the end of the boot
process the BOOT bit is set again to ‘0’.
Table 23.
High-pass filter mode configuration
HPM1
HPM0
High-pass filter mode
0
0
Normal mode (reset reading HP_RESET_FILTER)
0
1
Reference signal for filtering
1
0
Normal mode (reset reading HP_RESET_FILTER)
HPCF[1:0]. These bits are used to configure high-pass filter cut-off frequency ft which is
given by:
fs
1 -⎞ ⋅ -----f t = ln ⎛ 1 – ----------⎝
⎠
2π
HPc
The equation can be simplified to the following approximated equation:
fs
f t = --------------------6 ⋅ HPc
Table 24.
ft [Hz]
ft [Hz]
Data rate = 50 Hz
Data rate = 100 Hz
00
1
2
8
20
01
0.5
1
4
10
10
0.25
0.5
2
5
11
0.125
0.25
1
2.5
HPcoeff2,1
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High-pass filter cut-off frequency configuration
Doc ID 15797 Rev 1
ft [Hz]
ft [Hz]
Data rate = 400 Hz Data rate = 1000 Hz
LIS302DLH
7.4
Register description
CTRL_REG3 [Interrupt CTRL register] (22h)
Table 25.
CTRL_REG3 register
IHL
PP_OD
Table 26.
I2_CFG1
I2_CFG0
LIR1
I1_CFG1
I1_CFG0
CTRL_REG3 description
IHL
Interrupt active high, low. Default value: 0
(0: active high; 1:active low)
PP_OD
Push-pull/Open drain selection on interrupt pad. Default value 0.
(0: push-pull; 1: open drain)
LIR2
Latch interrupt request on INT2_SRC register, with INT2_SRC register cleared by
reading INT2_SRC itself. Default value: 0.
(0: interrupt request not latched; 1: interrupt request latched)
I2_CFG1,
I2_CFG0
Data signal on INT 2 pad control bits. Default value: 00.
(see table below)
LIR1
Latch interrupt request on INT1_SRC register, with INT1_SRC register cleared by
reading INT1_SRC register. Default value: 0.
(0: interrupt request not latched; 1: interrupt request latched)
I1_CFG1,
I1_CFG0
Data signal on INT 1 pad control bits. Default value: 00.
(see table below)
Table 27.
7.5
LIR2
Data signal on INT 1 and INT 2 pad
I1(2)_CFG1
I1(2)_CFG0
INT 1(2) Pad
0
0
Interrupt 1 (2) source
0
1
Interrupt 1 source OR interrupt 2 source
1
0
Data ready
1
1
Boot running
CTRL_REG4 (23h)
Table 28.
BDU
CTRL_REG4 register
BLE
FS1
FS0
STsign
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0
ST
SIM
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Register description
Table 29.
LIS302DLH
CTRL_REG4 description
BDU
Block data update. Default value: 0
(0: continuos update; 1: output registers not updated between MSB and LSB reading)
BLE
Big/little endian data selection. Default value 0.
(0: data LSB @ lower address; 1: data MSB @ lower address)
FS1, FS0
Full-scale selection. Default value: 00.
(00: ±2 g; 01: ±4 g; 11: ±8 g)
STsign
Self-test sign. Default value: 00.
(0: self-test plus; 1 self-test minus)
ST
Self-test enable. Default value: 0.
(0: self-test disabled; 1: self-test enabled)
SIM
SPI serial interface mode selection. Default value: 0.
(0: 4-wire interface; 1: 3-wire interface)
BDU bit is used to inhibit output registers update between the reading of upper and lower
register parts. In default mode (BDU = ‘0’) the lower and upper register parts are updated
continuously. If it is not sure to read faster than output data rate, it is recommended to set
BDU bit to ‘1’. In this way, after the reading of the lower (upper) register part, the content of
that output registers is not updated until the upper (lower) part is read too.
This feature avoids reading LSB and MSB related to different samples.
7.6
CTRL_REG5 (24h)
Table 30.
0
CTRL_REG5 register
0
Table 31.
TurnOn1,
TurnOn0
0
0
0
0
TurnOn1
TurnOn0
CTRL_REG5 description
Turn-on mode selection for sleep to wake function. Default value: 00.
TurnOn bits are used for turning on the sleep to wake function.
Table 32.
Sleep to wake configuration
TurnOn1
TurnOn0
Sleep to wake status
0
0
Sleep to wake function is disabled
1
1
Turned on: The device is in low power mode (ODR is defined in
CTRL_REG1)
Setting TurnOn[1:0] bits to 11 the “sleep to wake” function is enabled. When an interrupt
event occurs the device is turned to normal mode increasing the ODR to the value defined in
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LIS302DLH
Register description
CTRL_REG1. Although the device is in normal mode, CTRL_REG1 content is not
automatically changed to “normal mode” configuration.
7.7
HP_FILTER_RESET (25h)
Dummy register. Reading at this address zeroes instantaneously the content of the internal
high pass-filter. If the high pass filter is enabled all three axes are instantaneously set to 0g.
This allows to overcome the settling time of the high pass filter.
7.8
REFERENCE (26h)
Table 33.
Ref7
Table 34.
Ref7 - Ref0
REFERENCE register
Ref6
Ref5
Ref4
Ref3
Ref2
Ref1
Ref0
REFERENCE description
Reference value for high-pass filter. Default value: 00h.
This register sets the acceleration value taken as a reference for the high-pass filter output.
When filter is turned on (at least one of FDS, HPen2, or HPen1 bit is equal to ‘1’) and HPM
bits are set to “01”, filter out is generated taking this value as a reference.
7.9
STATUS_REG (27h)
Table 35.
ZYXOR
Table 36.
STATUS_REG register
ZOR
YOR
XOR
ZYXDA
ZDA
YDA
XDA
STATUS_REG description
ZYXOR
X, Y and Z axis data overrun. Default value: 0
(0: no overrun has occurred;
1: new data has overwritten the previous one before it was read)
ZOR
Z axis data overrun. Default value: 0
(0: no overrun has occurred;
1: a new data for the Z-axis has overwritten the previous one)
YOR
Y axis data overrun. Default value: 0
(0: no overrun has occurred;
1: a new data for the Y-axis has overwritten the previous one)
XOR
X axis data overrun. Default value: 0
(0: no overrun has occurred;
1: a new data for the X-axis has overwritten the previous one)
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Register description
Table 36.
7.10
LIS302DLH
STATUS_REG description (continued)
ZYXDA
X, Y and Z axis new data available. Default value: 0
(0: a new set of data is not yet available; 1: a new set of data is available)
ZDA
Z axis new data available. Default value: 0
(0: a new data for the Z-axis is not yet available;
1: a new data for the Z-axis is available)
YDA
Y axis new data available. Default value: 0
(0: a new data for the Y-axis is not yet available;
1: a new data for the Y-axis is available)
XDA
X axis new data available. Default value: 0
(0: a new data for the X-axis is not yet available;
1: a new data for the X-axis is available)
OUT_X_L (28h), OUT_X_H (29h)
X-axis acceleration data. The value is expressed as two’s complement.
7.11
OUT_Y_L (2Ah), OUT_Y_H (2Bh)
Y-axis acceleration data. The value is expressed as two’s complement.
7.12
OUT_Z_L (2Ch), OUT_Z_H (2Dh)
Z-axis acceleration data. The value is expressed as two’s complement.
7.13
INT1_CFG (30h)
Table 37.
AOI
Table 38.
30/37
INT1_CFG register
6D
ZHIE
ZLIE
YHIE
YLIE
XHIE
XLIE
INT1_CFG description
AOI
AND/OR combination of Interrupt events. Default value: 0.
(See Table 39)
6D
6 direction detection function enable. Default value: 0.
(See Table 39)
ZHIE
Enable interrupt generation on Z high event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value higher than preset threshold)
ZLIE
Enable interrupt generation on Z low event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value lower than preset threshold)
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LIS302DLH
Register description
Table 38.
INT1_CFG description
YHIE
Enable interrupt generation on Y high event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value higher than preset threshold)
YLIE
Enable interrupt generation on Y low event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value lower than preset threshold)
XHIE
Enable interrupt generation on X high event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value higher than preset threshold)
XLIE
Enable interrupt generation on X low event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value lower than preset threshold)
Configuration register for Interrupt 1 source.
Table 39.
7.14
Interrupt 1 source configurations
AOI
6D
Interrupt mode
0
0
OR combination of interrupt events
0
1
6 direction movement recognition
1
0
AND combination of interrupt events
1
1
6 direction position recognition
INT1_SRC (31h)
Table 40.
0
Table 41.
INT1_SRC register
IA
ZH
ZL
YH
YL
XH
XL
INT1_SRC description
IA
Interrupt active. Default value: 0
(0: no interrupt has been generated; 1: one or more interrupts have been generated)
ZH
Z high. Default value: 0
(0: no interrupt, 1: Z High event has occurred)
ZL
Z low. Default value: 0
(0: no interrupt; 1: Z Low event has occurred)
YH
Y high. Default value: 0
(0: no interrupt, 1: Y High event has occurred)
YL
Y low. Default value: 0
(0: no interrupt, 1: Y Low event has occurred)
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Register description
Table 41.
LIS302DLH
INT1_SRC description
XH
X high. Default value: 0
(0: no interrupt, 1: X High event has occurred)
XL
X low. Default value: 0
(0: no interrupt, 1: X Low event has occurred)
Interrupt 1 source register. Read only register.
Reading at this address clears INT1_SRC IA bit (and the interrupt signal on INT 1 pin) and
allows the refreshment of data in the INT1_SRC register if the latched option was chosen.
7.15
INT1_THS (32h)
Table 42.
INT1_THS register
0
Table 43.
THS6
THS4
THS3
THS2
THS1
THS0
D2
D1
D0
INT1_THS description
THS6 - THS0
7.16
THS5
Interrupt 1 threshold. Default value: 000 0000
INT1_DURATION (33h)
Table 44.
0
Table 45.
D6 - D0
INT1_DURATION register
D6
D5
D4
D3
INT1_DURATION description
Duration value. Default value: 000 0000
D6 - D0 bits set the minimum duration of the Interrupt 1 event to be recognized. Duration
steps and maximum values depend on the ODR chosen.
7.17
INT2_CFG (34h)
Table 46.
AOI
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INT2_CFG register
6D
ZHIE
ZLIE
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YHIE
YLIE
XHIE
XLIE
LIS302DLH
Register description
Table 47.
INT2_CFG description
AOI
AND/OR combination of interrupt events. Default value: 0.
(See table below)
6D
6 direction detection function enable. Default value: 0.
(See table below)
ZHIE
Enable interrupt generation on Z high event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value higher than preset threshold)
ZLIE
Enable interrupt generation on Z low event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value lower than preset threshold)
YHIE
Enable interrupt generation on Y high event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value higher than preset threshold)
YLIE
Enable interrupt generation on Y low event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value lower than preset threshold)
XHIE
Enable interrupt generation on X high event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value higher than preset threshold)
XLIE
Enable interrupt generation on X low event. Default value: 0
(0: disable interrupt request;
1: enable interrupt request on measured accel. value lower than preset threshold)
Configuration register for Interrupt 2 source.
Table 48.
7.18
Interrupt mode configuration
AOI
6D
Interrupt mode
0
0
OR combination of interrupt events
0
1
6 direction movement recognition
1
0
AND combination of interrupt events
1
1
6 direction position recognition
INT2_SRC (35h)
Table 49.
0
INT2_SRC register
IA
ZH
ZL
Doc ID 15797 Rev 1
YH
YL
XH
XL
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Register description
Table 50.
LIS302DLH
INT2_SRC description
IA
Interrupt active. Default value: 0
(0: no interrupt has been generated; 1: one or more interrupts have been generated)
ZH
Z high. Default value: 0
(0: no interrupt, 1: Z high event has occurred)
ZL
Z low. Default value: 0
(0: no interrupt; 1: Z low event has occurred)
YH
Y high. Default value: 0
(0: no interrupt, 1: Y high event has occurred)
YL
Y low. Default value: 0
(0: no interrupt, 1: Y low event has occurred)
XH
X high. Default value: 0
(0: no interrupt, 1: X high event has occurred)
XL
X Low. Default value: 0
(0: no interrupt, 1: X low event has occurred)
Interrupt 2 source register. Read only register.
Reading at this address clears INT2_SRC IA bit (and the interrupt signal on INT 2 pin) and
allows the refreshment of data in the INT2_SRC register if the latched option was chosen.
7.19
INT2_THS (36h)
Table 51.
INT2_THS register
0
Table 52.
THS6
THS4
THS3
THS2
THS1
THS0
D2
D1
D0
INT2_THS description
THS6 - THS0
7.20
THS5
Interrupt 2 threshold. Default value: 000 0000
INT2_DURATION (37h)
Table 53.
0
Table 54.
D6 - D0
INT2_DURATION register
D6
D5
D4
D3
INT2_DURATION description
Duration value. Default value: 000 0000
D6 - D0 bits set the minimum duration of the Interrupt 2 event to be recognized. Duration
time steps and maximum values depend on the ODR chosen.
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LIS302DLH
8
Package information
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK is an ST trademark.
Figure 12. LGA-14: mechanical data and package dimensions
OUTLINE AND
MECHANICAL DATA
LGA-14 (3x5x0.8mm)
Doc ID 15797 Rev 1
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Revision history
9
LIS302DLH
Revision history
Table 55.
36/37
Document revision history
Date
Revision
04-Jun-2009
1
Changes
Initial release
Doc ID 15797 Rev 1
LIS302DLH
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