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BMX160 Datasheet(HTML) 96 Page - Bosch Sensortec GmbH

Part No. BMX160
Description  Small, low power 9-axis sensor
Download  113 Pages
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Maker  BOSCH [Bosch Sensortec GmbH]
Homepage  https://www.bosch-sensortec.com
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BMX160 Datasheet(HTML) 96 Page - Bosch Sensortec GmbH

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BMX160
Data sheet
Page 96
BST-BMX160-DS000-12 | Revision 1.2 | January 2019
Bosch Sensortec
© 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 preliminary and
subject to change without notice.
Bit8-15: when in write mode, these are the data SDI, which will be written into the address. When
in read mode, these are the data SDO, which are read from the address.
Multiple read operations are possible by keeping CSB low and continuing the data transfer. Only
the first register address has to be written. Addresses are automatically incremented after each
read access as long as CSB stays active low.
The principle of multiple read is shown in figure below:
Start
RW
Stop
1
0
0
0
0
0
1
0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Register adress (02h)
CSB
=
0
CSB
=
1
Data byte
Data byte
Data register - adress 03h
Data register - adress 04h
Control byte
Data byte
Data register - adress 02h
Figure 25: SPI multiple read
In SPI 3-wire configuration CSB (chip select low active), SCK (serial clock), and SDI (serial data
input and output) pins are used. While SCK is high, the communication starts when the CSB is
pulled low by the SPI master and stops when CSB is pulled high. SCK is also controlled by SPI
master. SDI is driven (when used as input of the device) at the falling edge of SCK and should be
captured (when used as the output of the device) at the rising edge of SCK.
The protocol as such is the same in 3-wire configuration as it is in 4-wire configuration. The basic
operation wave-form (read or write access) for 3-wire configuration is depicted in the figure below:
CSB
SCK
SDI
RW
AD6
AD5
AD4
AD3
AD2
AD1
AD0
DI5
DI4
DI3
DI2
DI1
DI0
DI7
DI6
Figure 26: 3-wire basic SPI read or write sequence (mode ”11”)
3.3 I2C Interface
The I²C bus uses SCL (= SCx pin, serial clock) and SDA (= SDx pin, serial data input and output)
signal lines. Both lines are connected to VDDIO externally via pull-up resistors so that they are
pulled high when the bus is free.
The I²C addresses are identical to BMG160. The default I²C address of the device is 0b1101000
(0x68). It is used if the SDO pin is pulled to ´GND´. The alternative address 0b1101001 (0x69) is
selected by pulling the SDO pin to ”VDDIO”.


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