3-AXIS ACCELEROMETER DIGITAL I/F

BMA250

Manufacturer Part NumberBMA250
Description3-AXIS ACCELEROMETER DIGITAL I/F
ManufacturerBosch Sensortec
Series-
BMA250 datasheets
 


Specifications of BMA250

Featured ProductBMA250 - Digital, Triaxial Acceleration SensorAxisX, Y, Z
Acceleration Range±2g, 4g, 8g, 16gSensitivity256LSB/g, 128LSB/g, 64LSB/g, 16LSB/g
Voltage - Supply1.62 V ~ 3.6 VOutput TypeI²C™, SPI™
Bandwidth8Hz ~ 1kHzInterfaceI²C, SPI
Mounting TypeSurface MountPackage / Case12-VQFN
Lead Free Status / Rohs StatusLead free / RoHS CompliantFor Use With828-1024 - BMA250 DAUGHTERCARD FOR DEV KIT
Other names828-1023-2  
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Page 54/74

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6. Digital interfaces
The BMA250 supports two serial digital interface protocols for communication as a slave with a
host device (when operating in general mode): SPI and I²C. The active interface is selected by
the state of the Pin#11 (PS) ‘protocol select’ pin: ´0´ (´1´) selects SPI (I²C). For details see
section 4.2 Operational modes.
By default, SPI operates in the standard 4-wire configuration. It can be re-configured by
software to work in 3-wire mode instead of standard 4-wire mode.
Both interfaces share the same pins. The mapping for each interface is given in the following
table:
Table 71: Mapping of the interface pins
use w/
use w/
Pin#
Name
SPI
1
SDO
SDO
address
2
SDx
SDI
SDA
10
CSB
CSB
unused
12
SCx
SCK
SCL
The following table shows the electrical specifications of the interface pins:
Table 72: Electrical specification of the interface pins
Parameter
Symbol
R
TS
PS Impedance
for Tri-state Detection
C
TS
PS Impedance
R
NTS
for Non-Tri-state
Pull-up Resistance
R
up
Pull-down Resistance
R
down
Input Capacitance
C
in
I²C Bus Load
Capacitance (max.
C
I2C_Load
drive capability)
Rev. 1.0
© 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.
BMA250
Data sheet
Description
I²C
SPI: Data Output (4-wire mode)
I²C: Used to set LSB of I²C address
SPI: Data Input (4-wire mode) Data Input / Output (3-wire mode)
I²C: Serial Data
Chip Select (enable)
SPI: Serial Clock
I²C: Serial Clock
Condition
Min
Internal Pull-up
Resistance to VDDIO
Internal Pull-down
Resistance to GND
Page 54 / not for publishing
Bosch Sensortec
Typ
Max
1
10
5
70
120
190
12
20
32
5
10
400
03 March 2011
Units
M
pF
k
k
k
pF
pF