Datasheet

Datasheet
BMM150 Geomagnetic Sensor
Page 33
BST-BMM150-DS001-01 | Revision 1.0 | April 2013 Bosch Sensortec
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Note: Specifications within this document are subject to change without notice.
The following table shows the electrical specifications of the interface pins:
Table 28: Electrical specification of the interface pins
Parameter
Symbol
Condition
Min
Typ
Max
Unit
Pull-up Resistance
CSB
R
up, CSB
Internal Pull-up
Resistance to VDDIO;
deactivated in I²C
mode
80
100
120
k
Input Capacitance
C
in
10
pF
I²C Bus Load
Capacitance (max.
drive capability)
C
I2C_Load
400
pF
6.1 Serial peripheral interface (SPI)
The timing specification for SPI of the BMM150 is given in the following table:
Table 29: SPI timing for BMM150
Parameter
Symbol
Condition
Min
Max
Unit
Clock Frequency
f
SPI
Max. Load on SDI or
SDO = 25pF
10
MHz
SCK Low Pulse
t
SCKL
20
ns
SCK High Pulse
t
SCKH
20
ns
SDI Setup Time
t
SDI_setup
20
ns
SDI Hold Time
t
SDI_hold
20
ns
SDO Output Delay
t
SDO_OD
Load = 25pF
30
ns
Load = 250pF,
V
DDIO
= 2.4V
40
ns
CSB Setup Time
t
CSB_setup
20
ns
CSB Hold Time
t
CSB_hold
40
ns
The following figure shows the definition of the SPI timings given in Table 29:
Figure 8: SPI timing diagram
t
SDI_hold
t
SCKH
t
CSB_hold
t
CSB_setup
t
SDI_setup
t
SCKL
t
SDO_OD
CSB
SCK
SDI
SDO