LIS331DLMTR STMicroelectronics, LIS331DLMTR Datasheet - Page 15
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LIS331DLMTR
Manufacturer Part Number
LIS331DLMTR
Description
ACCELEROMETER MEMS 3AXIS 16-LGA
Manufacturer
STMicroelectronics
Series
MEMS, nanor
Datasheet
1.STEVAL-MKI091V1.pdf
(38 pages)
Specifications of LIS331DLMTR
Featured Product
STM32 Cortex-M3 Companion Products
Axis
X, Y, Z
Acceleration Range
±2g, 4g, 8g
Sensitivity
64LSB/G, 32LSB/g, 16LSB/g
Voltage - Supply
2.16 V ~ 3.6 V
Output Type
Digital
Bandwidth
100Hz ~ 400Hz Selectable
Interface
I²C, SPI
Mounting Type
Surface Mount
Package / Case
16-LGA
Sensing Axis
X, Y, Z
Acceleration
2 g, 4 g, 8 g
Digital Output - Number Of Bits
8 bit
Supply Voltage (max)
3.6 V
Supply Voltage (min)
2.16 V
Supply Current
250 uA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Digital Output - Bus Interface
I2C, SPI
Mounting Style
SMD/SMT
Shutdown
Yes
For Use With
497-10048 - BOARD EVAL ACCELEROMETER
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LIS331DLMTR
Manufacturer:
STMicroelect
Quantity:
4 650
Part Number:
LIS331DLMTR
Manufacturer:
ST
Quantity:
20 000
LIS331DLM
3
3.1
3.2
3.3
Functionality
The LIS331DLM 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 I
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.
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 I
device particularly suitable for direct interfacing with a microcontroller.
The LIS331DLM 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 LIS331DLM 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.
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.
2
C/SPI serial interface.
Doc ID 15102 Rev 4
2
C/SPI interface thus making the
Functionality
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