MC3253 Datasheet, PDF (50/72 Pages) List of Unclassifed Manufacturers – Axis Accelerometer

MC3253 3-Axis Accelerometer
Preliminary Datasheet
11.10 XOUT_EX, YOUT_EX & ZOUT_EX: X, Y, Z-AXIS EXTENDED
ACCELEROMETER REGISTERS
The measurements from sensors for the 3-axes are written to the registers XOUT_EX,
YOUT_EX & ZOUT_EX: X, Y, Z-Axis Extended Accelerometer Registers. The most-significant
bit of the value is the sign bit, and is sign extended to the higher bits. Note that all 3 axes are
sampled and updated simultaneously. If an I2C burst read operation reads past register
address 0x12 the internal address pointer “wraps” to address 0x03 and the contents of the
TILT: Status Register are returned. This allows application software to burst read the contents
of the six extended registers and relevant device state registers in a single I2C read cycle.
Once an I2C start bit has been recognized by the sensor, registers will not be updated until an
I2C stop bit has occurred. Therefore, if software desires to read the low and high byte registers
‘atomically’, knowing that the values have not been changed, it should do so by issuing a start
bit, reading one register, then reading the other register then issuing a stop bit. Note that all 6
registers may be read in one burst with the same effect.
10-bit samples occupy bits [9:0], with bits [15:9] occupied by the sign bit.
14-bit samples occupy bits [13:0], with bits [15:13] occupied by the sign bit.
Addr
0x0D
0x0E
0x0F
0x10
0x11
0x12
Name
XOUT
_EX_L
XOUT
_EX_H
YOUT
_EX_L
YOUT
_EX_H
ZOUT
_EX_L
ZOUT
_EX_H
Description
XOUT Extended
Register
XOUT Extended
Register
YOUT Extended
Register
YOUT Extended
Register
ZOUT Extended
Register
ZOUT Extended
Register
Bit 7 Bit 6 Bit 5 Bit 4
XOUT
_EX[7]
XOUT
_EX[15]
YOUT
_EX[7]
YOUT
_EX[15]
ZOUT
_EX[7]
ZOUT
_EX[15]
XOUT
_EX[6]
XOUT
_EX[14]
YOUT
_EX[6]
YOUT
_EX[14]
ZOUT
_EX[6]
ZOUT
_EX[14]
XOUT
_EX[5]
XOUT
_EX[13]
YOUT
_EX[5]
YOUT
_EX[13]
ZOUT
_EX[5]
ZOUT
_EX[13]
XOUT
_EX[4]
XOUT
_EX[12]
YOUT
_EX[4]
YOUT
_EX[12]
ZOUT
_EX[4]
ZOUT
_EX[12]
Bit 3 Bit 2
XOUT
_EX[3]
XOUT
_EX[11]
YOUT
_EX[3]
YOUT
_EX[11]
ZOUT
_EX[3]
ZOUT
_EX[11]
XOUT
_EX[2]
XOUT
_EX[10]
YOUT
_EX[2]
YOUT
_EX[10]
ZOUT
_EX[2]
ZOUT
_EX[10]
Bit 1
XOUT
_EX[1]
XOUT
_EX[9]
YOUT
_EX[1]
YOUT
_EX[9]
ZOUT
_EX[1]
ZOUT
_EX[9]
Table 32. Extended Accelerometer Registers
Bit 0
XOUT
_EX[0]
XOUT
_EX[8]
YOUT
_EX[0]
YOUT
_EX[8]
ZOUT
_EX[0]
ZOUT
_EX[8]
POR R/
Value W
0x00 R
0x00 R
0x00 R
0x00 R
0x00 R
0x00 R
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APS-048-0026v1.2
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