FXLS8964AF datasheet(35/98 Pages) NXP

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NXP Semiconductors

FXLS8964AF

3-Axis Low-g Accelerometer

Bit

Name

—

VECM[11:8]

Reset

Access

Table 26. VECM_MSB register (address 03h) bit allocation

Field

Description

3 to 0

VECM[11:8]

MSB of the 12-bit unsigned acceleration vector modulus result

Table 27. VECM_MSB register (address 03h) bit description

15.5 OUT_X_LSB, OUT_X_MSB, OUT_Y_LSB, OUT_Y_MSB, OUT_Z_LSB,

OUT_Z_MSB registers (addresses 04h to 09h)

These registers contain the 12-bit X-axis, Y-axis, and Z-axis output acceleration data in

2's complement format.

The output data is latched into the

OUT_X/Y/Z registers along with the assertion of the

SRC_DRDY event flag.

When

SENS_CONFIG2[F_READ] = 1, the auto-increment mechanism skips the MSB

registers in a burst read transaction. This operation shortens the output data size from 6

bytes to 3 bytes per XYZ sample read.

The byte order of the output data is programmable via

SENS_CONFIG2[LE_BE] and

defaults to little-endian mode.

When

SENS_CONFIG2[F_READ] = 1, the MSB of each axis's data is stored at the LSB

address, regardless of the setting made in

SENS_CONFIG2[LE_BE].

In little-endian mode, the output data registers are arranged with the LSB of each axis's

data stored at the lower address. The upper nibble (MSB) is stored at the next address,

in right justified format. In little-endian mode, the MSB is sign extended to form a 16-bit

2's complement value.

In big-endian mode (

SENS_CONFIG2[LE_BE] = 1), the output data registers are

arranged with the MSB of each axis's data stored at the lower register address. The

lower nibble is stored at the next address, and is left justified. The big-endian option

allows a big-endian processor to directly read the output data into an array without the

need to perform byte swaps. The host software must right shift the data by 4 bits (or

divide by 16) in order to obtain the correct scaling of the output data. The sign extension

of the data must be done explicitly, depending on the C compiler used.

Notes:

• There is a ~40 µs delay between the ADC acquisitions of the accelerometer X,Y,Z, and

temperature data. The temperature data is acquired first, followed by the X, Y, and Z

axes acceleration data. All data is latched into the output registers at the same time

instant, coincident with the SRC_DRDY event flag being asserted. Whenever any of

the

OUT_X/Y/Z registers is read the SRC_DRDY event flag is cleared.

• SX means sign extension, which is the logic level of the most significant bit of the 12-bit

OUT_X/Y/Z register data, also known as OUT_X/Y/Z[11].

FXLS8964AF

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3.4 — 7 December 2021

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