ADIS16448SLASHPCBZ datasheet(13/24 Pages) AD

13 / 24 page

Data Sheet

ADIS16448

Rev. B | Page 13 of 24

MAGNETOMETERS

XMAGN_OUT (see Table 17) contains x-axis magnetometer

data (mX in Figure 17), YMAGN_OUT (see Table 18) contains

y-axis magnetometer data (mY in Figure 17), and ZMAGN_OUT

(see Table 19) contains z-axis magnetometer data (mZ in

Figure 17). Table 20 illustrates the magnetometer data format

with numerical examples. The lower four bits of each magne-

tometer output data register (xMAGN_OUT[3:0]) are not active

at the maximum update rate of 51.2 SPS. They become active

when using SMPL_PRD[12:8] to average and decimate the

data. The number of bits that become active is equal to the

decimation setting number in SMPL_PRD[12:8]. For example,

if SMPL_PRD[15:8] = 0x02, xMAGN_OUT[15:2] are active

and xMAGN_OUT[1:0] are inactive.

Table 17. XMAGN_OUT (Base Address = 0x10), Read Only

Bits

Description

[15:0]

X-axis magnetic field intensity data, ±1.9 gauss

twos complement, 7 LSB/mgauss, 0x0000 = 0 mgauss

Table 18. YMAGN_OUT (Base Address = 0x12), Read Only

Bits

Description

[15:0]

Y-axis magnetic field intensity data, ±1.9 gauss

twos complement, 7 LSB/mgauss, 0x0000 = 0 mgauss

Table 19. ZMAGN_OUT (Base Address = 0x14), Read Only

Bits

Description

[15:0]

Z-axis magnetic field intensity data, ±1.9 gauss

twos complement, 7 LSB/mgauss, 0x0000 = 0 mgauss

Table 20. Magnetometer, Twos Complement Format

Magnetic Field

(mgauss)

Decimal

Hex

Binary

+1900

+13,300

0x33F4

0011 0011 1111 0100

+2 ÷ 7

0x0002

0000 0000 0000 0010

+1 ÷ 7

0x0001

0000 0000 0000 0001

0x0000

0000 0000 0000 0000

+1 ÷ 7

−1

0xFFFF

1111 1111 1111 1111

+2 ÷ 7

−2

0xFFFE

1111 1111 1111 1110

−1900

−13,300

0xCC0C

1100 1100 0000 1100

BAROMETRIC PRESSURE

BARO_OUT (see Table 21) contains the barometric pressure

data. Table 22 provides several numerical format examples for

BARO_OUT.

Table 21. BARO_OUT (Base Address = 0x16), Read Only

Bits

Description

[15:0]

Barometric pressure data, binary data format,

20 µbar per LSB, 0x0000 = 0 mbar

Table 22. Pressure, Binary, BARO_OUT

Pressure

Decimal

Hex

Binary

1200 mbar

60,000

0xEA60

1110 1010 0110 0000

1100 mbar

55,000

0xD6D8

1101 0110 1101 1000

1000 mbar

50,000

0xC350

1100 0011 0101 0000

0.04 mbar

0x0002

0000 0000 0000 0010

0.02 mbar

0x0001

0000 0000 0000 0001

0 mbar

0x0000

0000 0000 0000 0000

REMOTE PRESSURE SENSING

The ADIS16448 package offers a threaded hole (10-32) to

support remote pressure sensing. Figure 18 provides an example

of a fitting, which mates this hole to a barbed interface that

enables a tight connection with rubber tubing (1/8”).

Figure 18. Barb Fitting for Remote Pressure Sensing

INTERNAL TEMPERATURE

The internal temperature measurement data loads into the

TEMP_OUT (see Table 23) register. Table 24 illustrates the

temperature data format. Note that this temperature repre-

sents an internal temperature reading, which will not precisely

represent external conditions. The intended use of TEMP_OUT

is to monitor relative changes in temperature.

Table 23. TEMP_OUT (Base Address = 0x18), Read Only

Bits

Description

[15:12]

Not used

[11:0]

Twos complement, 0.07386°C/LSB, 31°C = 0x000

Table 24. Temperature, Twos Complement Format

Temperature (°C)

Decimal

Hex

Binary

+105

+1002

3EA

0011 1110 1010

+85

+731

2DB

0010 1101 1011

+31.14772

0000 0000 0010

+31.07386

0000 0000 0001

+31

0000 0000 0000

+30.92614

−1

FFF

1111 1111 1111

+30.85228

−2

FFE

1111 1111 1110

−40

−962

C3E

1100 0011 1110

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