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ADIS16488 Datasheet(PDF) 17 Page - Analog Devices |
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ADIS16488 Datasheet(HTML) 17 Page - Analog Devices |
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17 / 36 page  Data Sheet ADIS16488 Rev. B | Page 17 of 36 MAGNETOMETERS The registers that use the x_MAGN_OUT format are the primary registers for the magnetometer measurements. When processing data from these registers, use a 16-bit, twos complement data format. Table 38, Table 39, and Table 40 provide each register’s numerical format, and Table 41 provides x_MAGN_OUT digital coding examples. Table 38. X_MAGN_OUT (Page 0, Base Address = 0x28) Bits Description [15:0] X-axis magnetometer data; twos complement, ±3.2767 gauss range, 0 gauss = 0x0000, 1 LSB = 0.1 mgauss Table 39. Y_MAGN_OUT (Page 0, Base Address = 0x2A) Bits Description [15:0] Y-axis magnetometer data; twos complement, ±3.2767 gauss range, 0 gauss = 0x0000, 1 LSB = 0.1 mgauss Table 40. Z_MAGN_OUT (Page 0, Base Address = 0x2C) Bits Description [15:0] Z-axis magnetometer data; twos complement, ±3.2767 gauss range, 0 gauss = 0x0000, 1 LSB = 0.1 mgauss Table 41. x_MAGN_OUT Data Format Examples Magnetic Field Decimal Hex Binary +3.2767 gauss +32,767 0x7FFF 0111 1111 1111 1111 +0.2 mgauss +2 0x0002 0000 0000 0000 0010 +0.1 mgauss +1 0x0001 0000 0000 0000 0001 0 gauss 0 0x0000 0000 0000 0000 0000 −0.1 mgauss −1 0xFFFF 1111 1111 1111 1111 −0.2 mgauss −2 0xFFFE 1111 1111 1111 1110 −3.2768 gauss −32,768 0x8000 1000 0000 0000 0000 BAROMETER The BAROM_OUT register (see Table 42) and BAROM_LOW register (see Table 44) provide access to the barometric pressure 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 42 provides the numerical format in BAROM_OUT, and Table 43 provides digital coding examples. Table 42. 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 43. BAROM_OUT Data Format Examples Pressure (bar) Decimal Hex Binary +0.00004 × (215 − 1) +32,767 0x7FFF 0111 1111 1110 1111 +0.00008 +2 0x0002 0000 0000 0000 0010 +0.00004 +1 0x0001 0000 0000 0000 0001 0 0 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 44. 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 ADIS16488 (see Table 45). Table 46 provides TEMP_OUT digital coding examples. Note that this temperature reflects a higher temperature than ambient, due to self-heating. Table 45. TEMP_OUT (Page 0, Base Address = 0x0E) Bits Description [15:0] Temperature data; twos complement, 0.00565°C per LSB, 25°C = 0x0000 Table 46. TEMP_OUT Data Format Examples Temperature (°C) Decimal Hex Binary +85 +10,619 0x297B 0010 1001 0111 1011 +25 + 0.0113 +2 0x0002 0000 0000 0000 0010 +25 + 0.00565 +1 0x0001 0000 0000 0000 0001 +25 0 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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