LIS2DTW12
Datasheet
MEMS digital output dual motion and temperature sensor
Features
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Ultra-low power consumption: 50 nA in power-down mode, below 1 µA in active
low-power mode
Very low noise: down to 1.3 mg RMS in low-power mode
0.8 °C (typ. accuracy) embedded temperature sensor
Multiple operating modes with multiple bandwidths
Android stationary detection, motion detection
Supply voltage, 1.62 V to 3.6 V
Independent IO supply
±2g/±4g/±8g/±16g full scale
High-speed I²C/SPI digital output interface
Single data conversion on demand
16-bit accelerometer data output
12-bit temperature data output
Self-test
32-level FIFO
10000
g
high shock survivability
ECOPACK,
RoHS and “Green” compliant
Applications
Product status link
LIS2DTW12
Product summary
Order code
Temperature
range [°C]
Package
Packing
LIS2DTW12TR
-40 to +85
LGA-12
Tape and reel
Product label
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Fragile shipment tracking
Motion and temperature monitoring in battery-powered devices
Gesture recognition and gaming
Motion-activated functions and user interfaces
Display orientation
Tap/double-tap recognition
Free-fall detection
Smart power saving for handheld devices
Hearing aids
Portable healthcare devices
Wireless sensor nodes
Motion-enabled metering devices
Description
The
LIS2DTW12
is an ultra-low-power high-performance three-axis linear
accelerometer and temperature sensor belonging to the “femto” family which
leverages on the robust and mature manufacturing processes already used for the
production of micromachined accelerometers.
The device has user-selectable full scales of ±2g/±4g/±8g/±16g and is capable of
measuring accelerations with output data rates from 1.6 Hz to 1600 Hz.
The LIS2DTW12 has an embedded 0.8 °C (typ. accuracy) temperature sensor with
ODRs ranging from 50 to 1.6 Hz and resolution from 8 to 12 bits.
DS12825
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Rev 3
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July 2019
For further information contact your local STMicroelectronics sales office.
www.st.com
LIS2DTW12
The LIS2DTW12 has an integrated 32-level first-in, first-out (FIFO) buffer allowing the
user to store data in order to limit intervention by the host processor.
The embedded self-test capability allows the user to check the functioning of the
sensor in the final application.
The device has a dedicated internal engine to process motion and acceleration
detection including free-fall, wakeup, highly configurable single/double-tap
recognition, activity/inactivity, stationary/motion detection, portrait/landscape
detection and 6D/4D orientation.
The LIS2DTW12 is available in a 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.
DS12825
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Rev 3
page 2/65
LIS2DTW12
Block diagram and pin description
1
1.1
Block diagram and pin description
Block diagram
Figure 1.
Block diagram
X+
Y+
Z+
CHARG E
AMPLIFIE R
MUX
A/D
CONVERTER
CONTROL
LOGIC
IC
SPI
2
CS
SCL/SPC
SDA/SDO/SDI
SDO/SA0
a
Z-
Y-
X-
TEMPERATURE SENSOR
SELF TEST
REFERENCE
TRIMMING
CIRCUITS
32 Level
CLOCK
FIFO
CONTROL LOGIC
&
INTERRUPT GEN.
INT1
INT2
DS12825
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Rev 3
page 3/65
LIS2DTW12
Pin description
1.2
Pin description
Figure 2.
Pin connections
Z
INT2
INT1
1
VDDIO
10
11
12
1
SCL/SPC
CS
VDD
9
2
3
GND
8
7
6
GND
5
NC
SDO/SA0
SDA/SDI/SDO
X
(TOPVIEW)
Y
RES
4
DIRECTION OF THE
DETECTABLE
ACCELERATIONS
(BOTTOM VIEW)
Table 1.
Pin description
Pin#
1
Name
SCL
SPC
I²C serial clock (SCL)
SPI serial port clock (SPC)
SPI enable
2
(1)
CS
I²C/SPI mode selection
(1: SPI idle mode / I²C communication enabled;
0: SPI communication mode / I²C disabled)
3
(1)
SDO
SA0
SDA
4
SDI
SDO
5
6
7
8
9
10
11
12
NC
GND
RES
GND
VDD
VDD_IO
INT2
INT1
SPI serial data output (SDO)
I²C less significant bit of the device address (SA0)
I²C serial data (SDA)
SPI serial data input (SDI)
3-wire interface serial data output (SDO)
Internally not connected. Can be tied to VDD, VDDIO, or GND.
0 V supply
Connect to GND
0 V supply
Power supply
Power supply for I/O pins
Interrupt pin 2. Clock input when selected in single data conversion on demand.
Interrupt pin 1
Function
1. SDO/SA0 and CS pins are internally pulled up. Refer to
Table 2. Internal pull-up values (typ.) for SDO/SA0 and CS pins
for
the internal pull-up values (typ).
DS12825
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Rev 3
page 4/65
LIS2DTW12
Pin description
Table 2.
Internal pull-up values (typ.) for SDO/SA0 and CS pins
Vdd_IO
1.7 V
1.8 V
2.5 V
3.6 V
Resistor value for SDO/SA0 and CS pins
Typ. (kΩ)
54.4
49.2
30.4
20.4
DS12825
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Rev 3
page 5/65
