AN4506 Просмотр технического описания (PDF) - STMicroelectronics

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AN4506

L3GD20H: 3-axis digital output gyroscope

STMicroelectronics 

Digital filters

AN4506

3.6.3

Example of angular rate data

Table 7 provides a few basic examples of the data that is read in the data-registers when the

device is subject to a given angular rate. The values listed in the table are given under the

hypothesis of perfect device calibration (i.e. no offset, no gain error,....) and practically show

the effect of the BLE bit.

Table 7. Output data registers content vs. angular rate (FS = 245 dps)

BLE = 0

BLE = 1

Angular rate values

Register address

0 dps

100 dps

200 dps

-100 dps

-200 dps

28h

29h

28h

29h

00h

00h

00h

00h

A4h

2Ch

2Ch

A4h

49h

59h

59h

49h

5Ch

D3h

D3h

5Ch

B7h

A6h

A6h

B7h

4

Digital filters

The L3GD20H provides embedded low-pass as well as high-pass filtering capability to

easily delete the DC component of the measured angular rate. As shown in Figure 7,

through the HPen, IG_Sel and Out_Sel bits of the CTRL5 register, it is possible to

independently apply the filter on the output/FIFO data and/or on the interrupt data. This

means that it is possible to get filtered data while the interrupt generation works on unfiltered

data.

BOOT

Table 8. CTRL5 register

FIFO_EN StopOnFTH HPen IG_Sel1 IG_Sel0

Out_Sel1

Out_Sel0

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DocID026442 Rev 2

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