CMA3000-D0X Datasheet, PDF (12/35 Pages) VTI technologies – 3-axis accelerometer

CMA3000-D0X Series
3 Addressing Space
The CMA3000 register contents and bit definitions are described in more detail in the following
sections.
3.1 Register Description
The CMA3000 addressing space is presented in Table 3 below.
Table 3. List of registers
Address
00h
Name
WHO_AM_I
Description
Identification register
Mode
(R, RW, NV)
R
01h
REVID
ASIC revision ID, fixed in metal
R
02h
CTRL
Configuration (por, operation
RW
modes)
03h
STATUS
Status (por, EEPROM parity)
R
04h
RSTR
Reset Register
RW
05h
INT_STATUS
Interrupt status register
R
06h
DOUTX
X channel output data register
R
07h
DOUTY
Y channel output data register
R
08h
DOUTZ
Z channel output data register
R
09h
MDTHR
0Ah
MDFFTMR
0Bh
FFTHR
0Ch
I2C_ADDR
Motion detection threshold value
RW
register
Free fall and motion detection
RW
time register
Free fall threshold value register
RW
I²C device address
R
0Dh-19h
Reserved
Address is the register address in hex format.
RW – Read / Write register, R – Read-only register, NV – non-volatile register content.
Reg.
type
Output
Output
Conf
Output
Conf
Output
Output
Output
Output
Conf
Conf
Conf
Conf
3.2 Non-volatile memory
The CMA3000 has an internal non-volatile memory for calibration and configuration data. Memory
content will be programmed during production and is not user configurable. Initial configuration
values mirrored to volatile registers after reset can be found in the following section 3.3.
3.3 Registers
Address: 00h
Register name: WHO_AM_I, Identification register
Bits
Mode
Initial
Value
Name Description
7
R
0
Reserved
6:0
R
xxh
Identification register
Address: 01h
Register name: REVID, ASIC revision ID
Bits
Mode
Initial
Value
Name
7:4
R
1h
REVMAJ
3:0
R
0h
REVMIN
Description
Major revision number
Minor revision number (metal mask change)
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