AN4505 datasheet(10/43 Pages) STMICROELECTRONICS

10 / 43 page

Reading angular rate data

AN4505

10/43

DocID026441 Rev 1

Reading angular rate data

3.1

Startup sequence

Once the device is powered-up, it automatically downloads the calibration coefficients from

the embedded flash to the internal registers. When the boot procedure is completed, i.e.

after approximately 10 milliseconds, the device automatically enters power-down mode. To

turn on the device and gather angular rate data, it is necessary to select one of the

operating modes through CTRL_REG1 and to enable at least one of the axes.

The following general-purpose sequence can be used to configure the device:

3.2

Using the status register

The device is provided with a STATUS_REG which should be polled to check when a new

set of data is available. The reads should be performed as follows:

Write CTRL_REG2

Write CTRL_REG3

Write CTRL_REG4

Write CTRL_REG6

Write REFERENCE

Write INT1_THS

Write INT1_DUR

Write INT1_CFG

Write CTRL_REG5

10. Write CTRL_REG1

Read STATUS_REG

If STATUS_REG(3) = 0, then go to 1

If STATUS_REG(7) = 1, then some data have been overwritten

Read OUT_X_L

Read OUT_X_H

Read OUT_Y_L

Read OUT_Y_H

Read OUT_Z_L

Read OUT_Z_H

10. Data processing

11. Go to 1

AN4505 Datasheet(PDF) 10 Page - STMicroelectronics