|
|
PDF ADXL312 Data sheet ( Hoja de datos )
| Número de pieza | ADXL312 | |
| Descripción | Digital Accelerometer | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ADXL312 (archivo pdf) en la parte inferior de esta página. Total 32 Páginas | ||
|
No Preview Available !
3-Axis, ±1.5 g/±3 g/±6 g/±12 g
Digital Accelerometer
ADXL312
FEATURES
GENERAL DESCRIPTION
Ultralow power: as low as 57 μA in measurement mode and
0.1 μA in standby mode at VS = 3.3 V (typical)
Power consumption scales automatically with bandwidth
User-selectable resolution
Fixed 10-bit resolution
Full resolution, where resolution increases with g range,
up to 13-bit resolution at ±12 g (maintaining 2.9 mg/LSB
scale factor in all g ranges)
Embedded, patent pending FIFO technology minimizes host
processor load
Built-in motion detection functions for activity/inactivity
monitoring
Supply and I/O voltage range: 2.0 V to 3.6 V
SPI (3- and 4-wire) and I2C digital interfaces
Flexible interrupt modes mappable to either interrupt pin
Measurement ranges selectable via serial command
Bandwidth selectable via serial command
Wide temperature range (−40 to +105°C)
10,000 g shock survival
Pb free/RoHS compliant
Small and thin: 5 mm × 5 mm × 1.45 mm LFCSP package
Qualified for automotive applications
The ADXL312 is a small, thin, low power, 3-axis accelerometer
with high resolution (13-bit) measurement up to ±12 g. Digital
output data is formatted as 16-bit twos complement and is
accessible through either a SPI (3- or 4-wire) or I2C digital
interface.
The ADXL312 is well suited for car alarm or black box applica-
tions. It measures the static acceleration of gravity in tilt-sensing
applications, as well as dynamic acceleration resulting from
motion or shock. Its high resolution (2.9 mg/LSB) enables
resolution of inclination changes of as little as 0.25°. A built-in
FIFO facilitates using oversampling techniques to improve
resolution to as little as 0.05° of inclination.
Several special sensing functions are provided. Activity and
inactivity sensing detects the presence or absence of motion and
whether the acceleration on any axis exceeds a user-set level.
These functions can be mapped to interrupt output pins. An
integrated 32 level FIFO can be used to store data to minimize
host processor intervention.
Low power modes enable intelligent motion-based power
management with threshold sensing and active acceleration
measurement at extremely low power dissipation.
APPLICATIONS
Car alarm
Hill start aid (HSA)
Electronic parking brake
Data recorder (black box)
The ADXL312 is supplied in a small, thin 5 mm × 5 mm ×
1.45 mm, 32-lead, LFCSP package.
FUNCTIONAL BLOCK DIAGRAM
VS VDD I/O
ADXL312
POWER
MANAGEMENT
3-AXIS
SENSOR
SENSE
ELECTRONICS
ADC
DIGITAL
FILTER
CONTROL
AND
INTERRUPT
LOGIC
INT1
INT2
www.DataSheet4U.com
32 LEVEL
FIFO
SERIAL I/O
GND
CS
Figure 1. ADXL312 Simplified Block Diagram
SDA/SDI/SDIO
SDO/ALT
ADDRESS
SCL/SCLK
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2010 Analog Devices, Inc. All rights reserved.
1 page  
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Acceleration
Any Axis, Unpowered
Any Axis, Powered
VS
VDD I/O
All Other Pins
Output Short-Circuit Duration
(Any Pin to Ground)
Temperature Range
Powered
Storage
Rating
10,000 g
10,000 g
−0.3 V to 3.9 V
−0.3 V to 3.9 V
−0.3 V to VDD I/O + 0.3 V or
3.9 V, whichever is less
Indefinite
−40°C to +125°C
−40°C to +125°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ADXL312
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 3. Thermal Resistance
Package Type
θJA
32-Lead LFCSP Package
27.27
θJC
30
Unit
°C/W
ESD CAUTION
www.DataSheet4U.com
Rev. 0 | Page 5 of 32
5 Page 
Table 6. Current Consumption vs. Data Rate
(TA = 25°C, VS = VDD I/O = 3.3 V)
Output Data
Rate (Hz)
Bandwidth (Hz)
Rate Code
3200
1600
1111
1600
800
1110
800 400
1101
400 200
1100
200 100
1011
100 50
1010
50 25
1001
25 12.5
1000
12.5 6.25
0111
6.25 3.125
0110
IDD (μA)
170
115
170
170
170
170
115
82
65
57
Table 7. Current Draw vs. Data Rate, Low Power Mode
(TA = 25°C, VS = VDD I/O = 3.3 V)
Output Data
Rate (Hz)
Bandwidth (Hz)
Rate Code IDD (μA)
400 200
1100
115
200 100
1011
82
100 50
1010
65
50 25
1001
57
25 12.5
1000
50
12.5 6.25
0111
43
ADXL312
Autosleep Mode
Additional power savings can be had by having the ADXL312
automatically switch to sleep mode during periods of inactivity.
To enable this feature, set the THRESH_INACT register
(Address 0x25) to an acceleration threshold value. Levels of
acceleration below this threshold are regarded as no activity
levels. Set TIME_INACT (Address 0x26) to an appropriate
inactivity time period. Then set the AUTO_SLEEP bit and the
link bit in the POWER_CTL register (Address 0x2D). If the
device does not detect a level of acceleration in excess of
THRES_INACT for TIME_INACT seconds, then the device is
transitioned to sleep mode automatically. Current consumption
at the sub-8 Hz data rates used in this mode is typically 30 μA
for a VS of 3.3 V.
Standby Mode
For even lower power operation, standby mode can be used. In
standby mode, current consumption is reduced to 0.1μA
(typical). In this mode, no measurements are made. Standby
mode is entered by clearing the measure bit (Bit 3) in the
POWER_CTL register (Address 0x2D). Placing the device into
standby mode preserves the contents of the FIFO.
www.DataSheet4U.com
Rev. 0 | Page 11 of 32
11 Page | ||
| Páginas | Total 32 Páginas | |
| PDF Descargar | [ Datasheet ADXL312.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ADXL311 | Low Cost/ Ultracompact 2 g Dual-Axis Accelerometer | Analog Devices |
| ADXL311JE | Low Cost/ Ultracompact 2 g Dual-Axis Accelerometer | Analog Devices |
| ADXL311JE-REEL | Low Cost/ Ultracompact 2 g Dual-Axis Accelerometer | Analog Devices |
| ADXL312 | Digital Accelerometer | Analog Devices |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |