Datasheet

Preliminary Data Sheet
BMA400
Page 35 /
Confidential
BST-BMA400-DS000-00 | Version 0.1 | November 2017 Bosch Sensortec
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BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
If fh_param<4:0>= b00000, the header indicates a sensor-time frame to come, its format shown
below.
Bit
7
6
5
4
3
2
1
0
Header
1
0
1
0
0
0
0
0
time
sensor_time<7:0>
sensor_time<15:8>
sensor_time<23:16>
The data for the sensor-time frame consists of registers sensor_time2/1/0 at the moment
the sensor-time frame transmission has started. A sensor-time frame is not stored in the FIFO, it is
created on-the-fly and delivered with a FIFO burst read operation when all acceleration data frames
have been transmitted and the burst read carries on requesting data.
The sensortime frame will only be delivered if fifo_time_en = ‘1’.
The already mentioned control frame looks as follows
Bit
7
6
5
4
3
2
1
0
Header
0
1
0
0
1
0
0
0
Opcode
0
1
1
0
0
acc_config1_chg
acc_config0_chg
fifo_config0_chg
- fifo_config0_chg = b1: The control frame will be inserted when FIFO_CONFIG0.fifo_data_src
change becomes active in FIFO.
- acc_config0_chg = b1: The control frame will be inserted when ACC_CONFIG0.filt1_bw
change is valid for data stored in FIFO.
- acc_config1_chg: The control frame will be inserted when ACC_CONFIG1.acc_odr or
ACC_CONFIG1.osr or ACC_CONFIG1.acc_range change is valid for data stored in FIFO.
If more changes become active at one acceleration sample just one control frame will be inserted,
with more than one of the three CONF_chg bits set.
The data format for data frames is identical to the format defined for the data registers: signed integer.
If no axis is selected for FIFO storage no frames are written into the FIFO.
Confidential and under NDA
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Confidential and under NDA
Seeed Studio
Confidential and under NDA