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0-273-141-043 Datenblatt(PDF) 11 Page - List of Unclassifed Manufacturers

Teilenummer 0-273-141-043
Bauteilbeschribung  Digital, triaxial acceleration sensor
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Data sheet
BMA150
Triaxial, digital acceleration sensor
Bosch Sensortec
Rev. 1.5
Page 11
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.
3.1 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>
Full scale acceleration range
00
+/- 2g
01
+/- 4g
10
+/- 8g
11
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.


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