BMA150-0330SB0003 BOSCH, BMA150-0330SB0003 Datasheet - Page 29

• Manufacturer Part Number: BMA150-0330SB0003
• Description: Daughter Board
• Manufacturer: BOSCH

Specifications of BMA150-0330SB0003

• Silicon Manufacturer: Bosch
• Application Sub Type: Accelerometer - Three-Axis
• Kit Application Type: Sensing - Motion / Vibration / Shock
• Silicon Core Number: BMA150
• Kit Contents: Board

4.1.2 Three-wire SPI interface
3-wire SPI is not the default serial interface. The customer can easily activate the 3-wire SPI by
setting a control bit (SPI4=0). The 3-wire SPI interface uses SCK (serial clock), CSB (chip
select, active low) and SDA (serial data in/out). A maximum clock frequency up to 70MHz can
be handled.
The protocol data acquisition by the sensor IC occurs at the rising edge of SCK. The output data
provided by the sensor IC is synchronized also on the rising edges of SCK. The 3-wire read
protocol needs one extra clock cycle between address byte and data output byte.
Figure 8: Timing diagram for three-wire SPI interface (SDI = SDA)
Rev. 1.5
© 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.
CSB
SCK
SDI
T_setup_csb_3
7
r
T_high_sck_3
6
A6
5
A5
4
A4
T_low_sck_3
Triaxial, digital acceleration sensor
3
A3
A2
2
1
A1
Data sheet
BMA150
T_delay_sdi_3
Page 29
A0
0
T_delay_sdi_3
Xtra
7
D7
T_setup_sdi_3
6
D6
T_hold_sdi_3
5
D5
4
D4
3
D3
Bosch Sensortec
2
D2
1
D1
30 May 2008
T_hold_csb_3
D0
0