Datasheet

BMM150 Geomagnetic Sensor

Page 33

BST-BMM150-DS001-05 | Revision 1.4 | April 2020

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

Rup, CSB

Internal Pull-up

Resistance to VDDIO;

deactivated in I²C

mode

80

100

120

kΩ

Input Capacitance

Cin

10

pF

I²C Bus Load

Capacitance (max.

drive capability)

CI2C_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

fSPI

Max. Load on SDI or

SDO = 25pF

10

MHz

SCK Low Pulse

tSCKL

20

ns

SCK High Pulse

tSCKH

20

ns

SDI Setup Time

tSDI_setup

20

ns

SDI Hold Time

tSDI_hold

20

ns

SDO Output Delay

tSDO_OD

Load = 25pF

30

ns

Load = 250pF,

VDDIO = 2.4V

40

ns

CSB Setup Time

tCSB_setup

20

ns

CSB Hold Time

tCSB_hold

40

ns

The following figure shows the definition of the SPI timings given in Table 29:

Figure 8: SPI timing diagram

tSDI_hold

tSCKH

tCSB_hold

tCSB_setup

tSDI_setup

tSCKL

tSDO_OD

CSB

SCK

SDI

SDO