ADIS16228SLASHPCBZ datasheet(21/28 Pages) AD

21 / 28 page

Data Sheet

ADIS16228

Rev. B | Page 21 of 28

DATA FORMAT

Table 49, Table 50, and Table 51 list the bit assignments for

the x_BUF registers. The acceleration data format depends

on the range scale setting in REC_CTRL2 (see Table 14) and the

recording mode settings in REC_CTRL1 (see Table 9). Table 52

provides some data formatting examples for the FFT mode, and

Table 53 offers some data formatting examples for the16-bit,

twos complement format used in manual time mode.

Table 49. X_BUF (Base Address = 0x14), Read Only

Bits

Description (Default = 0x8000)

[15:0]

X-acceleration data buffer register.

See Table 15 for scale sensitivity.

Format = twos complement (time), binary (FFT).

Table 50. Y_BUF (Base Address = 0x16), Read Only

Bits

Description (Default = 0x8000)

[15:0]

Y-acceleration data buffer register.

See Table 15 for scale sensitivity.

Format = twos complement (time), binary (FFT).

Table 51. Z_BUF (Base Address = 0x18), Read Only

Bits

Description (Default = 0x8000)

[15:0]

Z-acceleration data buffer register.

See Table 15 for scale sensitivity.

Format = twos complement (time), binary (FFT).

Table 52. FFT Mode, 5 g Range, Data Format Examples

Acceleration (mg)

LSB

Hex

Binary

4,999.9237

65,535

0xFFFF

1111 1111 1111 1111

100 × 5 ÷ 65,536

100

0x0064

0000 0000 0110 0100

2 × 5 ÷ 65,536

0x0002

0000 0000 0000 0010

1 × 5 ÷ 65,536

0x0001

0000 0000 0000 0001

0x0000

0000 0000 0000 0000

Table 53. Manual Time Mode, 5 g Range, Data Format

Examples

Acceleration (mg)

LSB

Hex

Binary

+4999.847

+32,767

0x7FFF

1111 1111 1111 1111

~1000

+6,554

0x199A

0001 0001 10011010

+2 × 5 ÷ 32,768

0x0002

0000 0000 0000 0010

+1 × 5 ÷ 32,768

0x0001

0000 0000 0000 0001

0x0000

0000 0000 0000 0000

−1 × 5 ÷ 32,768

−1

0xFFFF

1111 1111 1111 1111

−2 × 5 ÷ 32,768

−2

0xFFFE

1111 1111 1111 1110

~−1000

−6554

0xE666

1110 0110 0110 0110

−5000

−32,768

0x8000

1000 0000 0000 0000

REAL-TIME DATA COLLECTION

When using real-time mode, select the output channel by

reading the associated x_BUF register. For example, set DIN =

0x1600 to select the y-axis sensor for sampling. After selecting

the channel, use the data-ready signal to trigger subsequent data

reading of the Y_BUF register. In this mode, use the time domain

data formatting for a range setting of 20 g, as shown in Table 15.

POWER SUPPLY/TEMPERATURE

At the end of each spectral record, the ADIS16228 also measures

power supply and internal temperature. It accumulates a 5.12 ms

record of power supply measurements at a sample rate of 50 kHz

and takes 64 samples of internal temperature data over a period

of 1.7 ms. The average of the power supply and internal tempera-

ture loads into the SUPPLY_OUT register (see Table 54) and the

TEMP_OUT register (see Table 56), respectively. When using

real-time mode, these registers update only when this mode starts.

Table 54. SUPPLY_OUT (Base Address = 0x0A), Read Only

Bits

Description (Default = 0x8000)

[15:12]

Not used

[11:0]

Power supply, binary, 3.3 V = 0xA8F, 1.22 mV/LSB

Table 55. Power Supply Data Format Examples

Supply Level (V)

LSB

Hex

Binary

3.6

2949

0xB85

1011 1000 0101

3.3 + 0.0012207

2704

0xA90

1010 1001 0000

3.3

2703

0xA8F

1010 1000 1111

3.3 − 0.0012207

2702

0xA8E

1010 1000 1110

3.15

2580

0xA14

1010 0001 0100

Table 56. TEMP_OUT (Base Address = 0x08), Read Only

Bits

Description (Default = 0x8000)

[15:12]

Not used

[11:0]

Temperature data, offset binary, 1278 LSB = +25°C,

−0.47°C/LSB

Table 57. Internal Temperature Data Format Examples

Temperature (°C)

LSB

Hex

Binary

125

1065

0x429

0100 0010 1001

25 + 0.47

1277

0x4FD

0100 1111 1101

1278

0x4FE

0100 1111 1110

25 − 0.47

1279

0x4FF

0100 1111 1111

1331

0x533

0101 0011 0011

−40

1416

0x588

0101 1000 1000

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