AN2847 datasheet(7/31 Pages) STMICROELECTRONICS

Il numero della parte	AN2847

Spiegazioni elettronici	This document provides application information for the low-voltage 3-axis digital output

PDF	31 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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7 / 31 page

AN2847

Start-up sequence

Doc ID 15136 Rev 2

7/31

Start-up sequence

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

the embedded Flash memory to the internal registers. When the boot procedure is complete

(i.e. after about 5 milliseconds), the device automatically enters power-down mode.

To turn on the device and gather acceleration data, it is necessary to select one of the

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

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

write CTRL_REG1

write CTRL_REG2

write CTRL_REG3

write CTRL_REG4

write Reference

write INT1_THS

write INT1_DUR

write INT2_THS

write INT2_DUR

10. read HP_FILTER_RESET (if filter is enabled)

11. write INT1_CFG

12. write INT2_CFG

13. write CTRL_REG5

Modifications take effect immediately.

Note that in case of changes in full scale, ODR or enabling/disabling of self-test, the output

of the device will require 1 ms + 1/ODR to settle (see

Table 11). If the HP filter cut-off

frequency is changed, the filter can be reset by reading the HP_FILTER_RESET register.

AN2847 Scheda tecnica(PDF) 7 Page - STMicroelectronics