Specifications

BMA180
Preliminary data sheet
Bosch Sensortec
Rev. 1.0 Page 58 / - proprietary information - 06 March 2009
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Specifications within this document are preliminary and subject to change without notice. Document is not intended for publication.
8 I²C and SPI-Interfaces
8.1 Specification of interface parameters
Interface
parameters :
Symbol Condition Min Typ Max Unit
Input - low level Vil_si V
DDIO
=
1.2V to 3.6V
0.3 * V
DDIO
V
Input – high level Vih_si V
DDIO
=
1.2V to 3.6V
0.7 *
V
DDIO
V
Output – low level
Output – low level
for 1.2V
Vol_SDI
Vol_SDI_1.2
V
DDIO
=1.62V,
iol=3 mA
V
DDIO
=1.2V,
iol=3 mA
0.2 * V
DDIO
0.23 * V
DDIO
V
V
Output – high level
Output – high level
for 1.2V
Voh_SDO
Voh_SDO_1.2
V
DDIO
=1.62V,ioh=2mA
V
DDIO
=1.2V, ioh=2mA
0.8*
V
DDIO
0.62 *
V
DDIO
V
V
Pull-up resistor Rpull_up Internal pull-up
resistance to V
DDIO
70 120 190 kOhm
Pull-down resistor Rpull_down Internal pull-down
resistance to VSS1
12 20 32 kOhm
I
2
C bus load
capacitor
Cb On SDI and SCK 400 pF
8.2 Interface selection
2 interface protocols are possible:
- When CSB=1, I²C functionality is enabled within state-machine.
- When CSB=0, 4-wire SPI is enabled.