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PDF SMB380 Data sheet ( Hoja de datos )
| Número de pieza | SMB380 | |
| Descripción | Triaxial acceleration sensor | |
| Fabricantes | Bosch | |
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SMB380
Triaxial
acceleration sensorPreliminary Data Sheet
SMB380
Triaxial acceleration sensor
Data Sheet (preliminary)
Bosch Sensortec
SMB380 Data sheet (preliminary)
Order code
0 273 141 006
Package type
10-pin QFN
Data sheet version
1.3
Release date
2007-09-18
NRoetevs. 1.3
Specifications arePsaugbeje1ct to change without notice. 18-September-2007
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
.7211RB11 Specifications are subject to change without notice.
1 page  
Preliminary Data Sheet
SMB380
Triaxial acceleration sensor
Bosch Sensortec
1. Specification
If not stated otherwise, the given values are maximum values over lifetime and full performance
temperature/voltage range in the normal operation mode.
Table 1: Operating range, output signal and mechanical specifications of the SMB380
Parameter
OPERATING RANGE
Symbol
Condition
Min
Typ
Max
Units
Acceleration Range
Supply Voltage
Analogue
gFS2g
gFS4g
gFS8g
VDD
Switchable via serial
digital interface
-2
-4
-8
2.4
2g
4g
8g
3.6 V
Supply Voltage for
Digital I/O
VDDIO
VDDIO ≤ VDD
1.62
3.6 V
Supply Current in
Normal Mode **
IDD Digital and analog
200 290 µA
Supply Current in
Standby Mode **
IDDsbm Digital and analog
1 2 µA
Operating
Temperature
TA
-40 +85 °C
ACCELERATION OUTPUT SIGNAL
Acceleration Output
Resolution
Format:
2’s complement
10 Bit
Sensitivity
Zero-g Offset
Zero-g Offset
S2g g-range ±2g
246 256 266 LSB/g
S4g g-range ±4g
122 128 134 LSB/g
S8g g-range ±8g
61 64 67 LSB/g
Off TA=25°C, calibrated
-60
60 mg
Off TA=25°C , over
lifetime *
-150
150 mg
Zero-g Offset
Temperature Drift
Over TA
1 mg/K
Power Supply
Rejection Ratio
PSRR Over VDD
0.2 LSB/V
* The offset can deviate from the original calibration mainly due to stress effects during soldering depending on the
soldering process. For many applications it is beneficial to re-calibrate the offset after PCB assembly (see application
note ANA016 “In-line offset re-calibration”).
** For more details on the SMB380’s current consumption during wake-up mode, please refer to chapter 7.3
Rev. 1.3
Page 5
18-September-2007
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
.7211RB11 Specifications are subject to change without notice.
5 Page 
Preliminary Data Sheet
SMB380
Triaxial acceleration sensor
Bosch Sensortec
3.1 Operational registers
3.1.1 SPI4
The SPI4 bit ((address 15h, bit 7) is used to select the correct SPI protocol (three-wire or four-
wire, SPI-mode 3). The default value stored in the non-volatile part of the memory is SPI4=1
(four-wire SPI is default value !). After power on reset or soft reset or writing to EEPROM the
SPI4 EEPROM setting (35h) is downloaded to the image register SPI4 and the corresponding
SPI protocol is selected.
If the desired SPI is three-wire, the microcontroller must first write SPI4 to 0 (in image register
only or in EEPROM). This first writing is possible because only CSB, SCK and SDI are required
for a write sequence and the 3 bit timing diagrams are identical in three-wire and four-wire
configuration.
Since EEPROM has limited write cycle lifetime (minimum 1000 cycles specified) it is
recommended to use one of the following procedures.
Procedure 1 (recommended): Set SPI4 in image to correct value (SPI4=0 for SPI three-wire,
SPI4=1 for SPI four-wire (=default)) every time after power on reset, soft reset or
EEPROM write command.
Procedure 2: Verify chip-ID (address 00h) after every power on reset, soft reset or EEPROM
write command to be chip_ID=02h. If chip_ID=FFh or chip_ID=00h unlock
EEPROM (section 3.3.3) and set SPI4 to correct interface in EEPROM at 35h.
Lock EEPROM. Optionally verify chip_ID after delay of >30ms.
Procedure 3: Set SPI4 once to correct interface in the EEPROM at 35h during final test
procedure at customer.
3.1.2 Range
These two bits (address 14h, bits 4 and 3) are used to select the full scale acceleration range.
Directly after changing the full scale range it takes 1/(2*bandwidth) to overwrite the data
registers with filtered data according to the selected bandwidth.
Table 3: Settings of full scale range register
range<1:0>
00
01
10
11
Full scale acceleration range
+/- 2g
+/- 4g
+/- 8g
Not authorised code
Important note:
Please refer to the comment in chapter 3 of how to protect bits 5, 6 and 7 when modifying other
bits of register 14h.
Rev. 1.3
Page 11
18-September-2007
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
.7211RB11 Specifications are subject to change without notice.
11 Page | ||
| Páginas | Total 52 Páginas | |
| PDF Descargar | [ Datasheet SMB380.PDF ] | |
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