BMA250 Bosch Sensortec, BMA250 Datasheet - Page 54

• Manufacturer Part Number: BMA250
• Description: 3-AXIS ACCELEROMETER DIGITAL I/F
• Manufacturer: Bosch Sensortec
• Series: -r

Specifications of BMA250

• Featured Product: BMA250 - Digital, Triaxial Acceleration Sensor
• Axis: X, Y, Z
• Acceleration Range: ±2g, 4g, 8g, 16g
• Sensitivity: 256LSB/g, 128LSB/g, 64LSB/g, 16LSB/g
• Voltage - Supply: 1.62 V ~ 3.6 V
• Output Type: I²C™, SPI™
• Bandwidth: 8Hz ~ 1kHz
• Interface: I²C, SPI
• Mounting Type: Surface Mount
• Package / Case: 12-VQFN
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With: 828-1024 - BMA250 DAUGHTERCARD FOR DEV KIT
• Other names: 828-1023-2

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
The following table shows the electrical specifications of the interface pins:
Table 72: Electrical specification of the interface pins
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.
Parameter
PS Impedance
for Tri-state Detection
PS Impedance
for Non-Tri-state
Pull-up Resistance
Pull-down Resistance
Input Capacitance
I²C Bus Load
Capacitance (max.
drive capability)
Pin#
10
12
1
2
Name
SDO
CSB
SDx
SCx
SDO
SDI
CSB
SCK
use w/
SPI
Symbol
C
R
I2C_Load
R
R
C
R
C
address
SDA
unused
SCL
down
NTS
use w/
TS
TS
up
in
I²C
Page 54 / not for publishing
Condition
Internal Pull-up
Resistance to VDDIO
Internal Pull-down
Resistance to GND
Description
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
Data sheet
BMA250
Min
70
12
1
Typ
120
20
5
Bosch Sensortec
Max
190
400
03 March 2011
10
32
10
5
Units
M
k
k
k
pF
pF
pF