BMA020 Bosch Sensortec, BMA020 Datasheet - Page 27

• Manufacturer Part Number: BMA020
• Description: 3-AXIS ACCELEROMETER DIGITAL I/F
• Manufacturer: Bosch Sensortec

Specifications of BMA020

• Axis: X, Y, Z
• Acceleration Range: ± 2g, 4g, 8g
• Sensitivity: 256LSB/g, 128LSB/g, 64LSB/g
• Voltage - Supply: 2 V ~ 3.6 V
• Output Type: Digital
• Bandwidth: 3kHz
• Interface: I²C, SPI
• Mounting Type: Surface Mount
• Package / Case: 12-LGA
• For Use With: 828-1014 - BMA020 TRIBOX DEMO BOARD W/USB828-1008 - BMA020 DAUGHTERCARD FOR DEV KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 828-1000-2

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. 1.2
© 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
Digital, triaxial acceleration sensor
3
A3
A2
2
1
A1
Data sheet
BMA020
T_delay_sdi_3
Page 27
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