Datasheet

Data Sheet
BMA456
Page 113
BST-BMA456-DS000-01 | Version 1.1 | October 2017 Bosch Sensortec
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Note: Specifications within this document are subject to change without notice.
Start R/W ACK ACK
0 0 1 1 0 0 0 0 X 0 0 1 0 0 1 0
Repeat
Start
R/W ACK ACK ACK
0 0 1 1 0 0 0 1 X X X X X X X X X X X X X X X X
…
ACK ACK
Master -> Slave
Slave -> Master
…
X X X X X X X X X X X X X X X X
…
ACK NACK Stop
…
X X X X X X X X X X X X X X X X
Register data - address 0x14
Register data - address 0x15
S
0
0
Slave I2C ID
Sr
0
0
Slave I2C ID
Data byte
Data byte
Register address (0x12)
0
Register data - address 0x13
Data byte
Data byte
Register data - address 0x12
P
Data byte
Data byte
Register data - address 0x16
Register data - address 0x17
0
0
0
1
In order to prevent the I²C slave of the device to lock-up the I²C bus, a watchdog timer (WDT) is
implemented. The WDT observes internal I²C signals and resets the I²C interface if the bus is locked-
up by the BMA456. The activity and the timer period of the WDT can be configured through the bits
NV_CONF.i2c_wdt_en and NV_CONF.i2c_wdt_sel.