AN4650 datasheet(76/102 Pages) STMICROELECTRONICS

76 / 102 page

First-in first-out (FIFO) buffer

AN4650

76/102

DocID027415 Rev 1

8.1.4

FIFO_CTRL4 (09h)

The FIFO_CTRL4 register contains the decimation factors used to define at which data rate

the data associated to the 3rd FIFO data set and the 4th FIFO are stored in the FIFO.

When the DEC_DS3_FIFO[2:0] bits are set to 000b, the 3rd FIFO data set is not stored in

the FIFO. When the DEC_DS4_FIFO[2:0] bits are set to 000b, the 4th FIFO data set is not

stored in the FIFO.

Note:

It’s required to set at least one of the four decimation factors to 1 (no decimation).

The FIFO_CTRL4 register also contains the bit ONLY_HIGH_DATA, which allows storing in

the FIFO only the upper part (Most Significant Byte) of accelerometer and gyroscope data,

in order to increase the maximum number of accelerometer and gyroscope samples in the

FIFO. See Section 8.7 for more details about this functionality.

Table 57. Accelerometer FIFO decimation setting

DEC_FIFO_XL [2:0]

Configuration

000

Accelerometer sensor not in FIFO

001

No decimation

010

Decimation with factor 2

011

Decimation with factor 3

100

Decimation with factor 4

101

Decimation with factor 8

110

Decimation with factor 16

111

Decimation with factor 32

Table 58. FIFO_CTRL4 register

ONLY_HIGH

_DATA

DEC_DS4

_FIFO2

DEC_DS4

_FIFO1

DEC_DS4

_FIFO0

DEC_DS3

_FIFO2

DEC_DS3

_FIFO1

DEC_DS3

_FIFO0

Table 59. 3rd FIFO data set decimation setting

DEC_DS3_FIFO [2:0]

Configuration

000

3rd FIFO data set not in FIFO

001

No decimation

010

Decimation with factor 2

011

Decimation with factor 3

100

Decimation with factor 4

101

Decimation with factor 8

110

Decimation with factor 16

111

Decimation with factor 32

AN4650 Datasheet(PDF) 76 Page - STMicroelectronics

AN4650 Datasheet(HTML) 76 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL