AN4506 Просмотр технического описания (PDF) - STMicroelectronics

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AN4506

L3GD20H: 3-axis digital output gyroscope

STMicroelectronics 

AN4506

2.5

Switching modes

The delay in order to switch modes is shown in Table 5.

Starting mode

Power-down

Power-down

Power-down

Sleep

Sleep

Normal

Normal

Other settings change

Table 5. Turn-on time

Target mode

Normal

Sleep

Self test

Normal

Power-down

Sleep

Power-down

-

Reading angular rate data

Turn-on time - typ.

100 ms

100 ms

100 ms

1/ODR: LPF2 disabled

6/ODR: LPF2 enabled

Immediate

Immediate

Immediate

1/ODR: LPF2 disabled

6/ODR: LPF2 enabled

3

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 Normal (or Low

ODR) mode and to enable at least one of the axes.

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

1. Write CTRL2

2. Write CTRL3

3. Write CTRL4

4. Write CTRL6

5. Write Reference

6. Write IG_THS

7. Write IG_DURATION

8. Write IG_CFG

9. Write CTRL5

10. Write CTRL1

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