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0-273-141-043 Datasheet(PDF) 8 Page - List of Unclassifed Manufacturers

Part No. 0-273-141-043
Description  Digital, triaxial acceleration sensor
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Maker  ETC2 [List of Unclassifed Manufacturers]
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Data sheet
BMA150
Triaxial, digital acceleration sensor
Bosch Sensortec
Rev. 1.5
Page 8
30 May 2008
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
3. Global memory map
The global memory map of BMA150 has three levels of access:
Memory Region
Content
Access Level
Operational
Registers
Data registers, control registers,
status registers, interrupt settings
Direct access via serial interface
Default Setting
Registers
Default values for operational
registers, acceleration and
temperature trimming values
Access blocked by default;
Access enabled by setting control
bit in operational registers via
serial interface
Bosch Sensortec
Reserved Registers
Internal trimming registers
Protected
The memory of BMA150 is realized in diverse physical architectures. Basically BMA150 uses
volatile memory registers to operate. The volatile part of the memory can be changed and read
quickly. Part of the volatile memory (“image”) is a copy of the non-volatile memory (EEPROM).
The EEPROM can be used to set default values for the operation of the sensor IC. The
EEPROM is write only. The register values are copied to the image registers after power on or
soft reset. The download of all EEPROM bytes to image registers is also done when the content
of one EEPROM byte has been changed by a write command.
All operational and default setting registers are accessible through serial interface with a
standard protocol:
Type of
Register
Function of Register
Command
Volatile / non-volatile
Data
Registers
− Chip identification, chip version
− Acceleration data, temperature
Read
Read
non-volatile (hard coded)
volatile
Control
Registers
− Activating self test, soft reset,
switch to sleep mode etc.
Read / Write
volatile
Status
Registers
− Interrupt status and self test
status
− Customer usable status bytes
Read
Read / Write
Volatile
volatile
Setting
Register
− Functional settings (range,
bandwidth)
− Interrupt settings
Read / Write
Read / Write
volatile
volatile
EEPROM
− Default settings of functional
and interrupt settings
− Trimming values
− Customer reserved data
storage
− Bosch Sensortec Reserved
Memory
Write
Write
Write
Write
non-volatile
non-volatile
non-volatile
non-volatile




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