ADIS16480 datasheet(21/40 Pages) AD

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Data Sheet

ADIS16480

Rev. 0 | Page 21 of 40

BAROMETER

The BAROM_OUT register (see Table 54) and BAROM_LOW

data. These two registers combine to provide a 32-bit, twos

complement format. Some applications are able to use

BAROM_OUT by itself. For cases where the finer resolution

available from BAROM_LOW is valuable, combine them in

the same manner as the gyroscopes (see Figure 18). When

processing data from the BAROM_OUT register alone, use a

16-bit, twos complement data format. Table 54 provides the

numerical format in BAROM_OUT, and Table 55 provides

digital coding examples.

Table 54. BAROM_OUT (Page 0, Base Address = 0x30)

Bits

Description

[15:0]

Barometric pressure; twos complement,

±1.31 bar range, 0 bar = 0x0000, 40 µbar/LSB

Table 55. BAROM_OUT Data Format Examples

Pressure (bar)

Decimal

Hex

Binary

+0.00004 × (215 − 1)

+32,767

0x7FFF

0111 1111 1111 1111

+0.00008

0x0002

0000 0000 0000 0010

+0.00004

0x0001

0000 0000 0000 0001

0x0000

0000 0000 0000 0000

−0.00004

−1

0xFFFF

1111 1111 1111 1111

−0.00008

−2

0xFFFE

1111 1111 1111 1110

−0.00004 × 215

−32,768

0x8000

1000 0000 0000 0000

The BAROM_LOW register provides additional resolution for

the barometric pressure measurement. The MSB has a weight

of 20 µbar, and each subsequent bit carries a weight of ½ of

the previous one.

Table 56. BAROM_LOW (Page 0, Base Address = 0x2E)

Bits

Description

[15:0]

Barometric pressure; additional resolution bits

INTERNAL TEMPERATURE

The TEMP_OUT register provides an internal temperature

measurement that can be useful for observing relative temperature

changes inside of the ADIS16480 (see Table 57). Table 58

provides TEMP_OUT digital coding examples. Note that this

temperature reflects a higher temperature than ambient, due

to self heating.

Table 57. TEMP_OUT (Page 0, Base Address = 0x0E)

Bits

Description

[15:0]

Temperature data; twos complement,

0.00565°C per LSB, 25°C = 0x0000

Table 58. TEMP_OUT Data Format Examples

Temperature (°C)

Decimal

Hex

Binary

+85

+10,619

0x297B

0010 1001 0111 1011

+25 + 0.0113

0x0002

0000 0000 0000 0010

+25 + 0.00565

0x0001

0000 0000 0000 0001

+25

0x0000

0000 0000 0000 0000

+25 − 0.00565

−1

0xFFFF

1111 1111 1111 1111

+25 − 0.0113

−2

0xFFFE

1111 1111 1111 1110

−40

−11,504

0xD310

1101 0011 0001 0000

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