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ADIS16489 Datasheet(PDF) 26 Page - Analog Devices |
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ADIS16489 Datasheet(HTML) 26 Page - Analog Devices |
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26 / 40 page  ADIS16489 Data Sheet Rev. B | Page 26 of 40 of how these two registers combine and influence the y-axis accelerometer measurements. Calibration, Accelerometer Bias (ZA_BIAS_LOW, ZA_BIAS_HIGH) Table 128. ZA_BIAS_LOW Register Definitions Page Addresses Default Access Flash Backup 0x02 0x24, 0x25 0x0000 R/W Yes Table 129. ZA_BIAS_LOW Bit Definitions Bits Description [15:0] Z-axis accelerometer offset correction, low word Table 130. ZA_BIAS_HIGH Register Definitions Page Addresses Default Access Flash Backup 0x02 0x26, 0x27 0x0000 R/W Yes Table 131. ZA_BIAS_HIGH Bit Definitions Bits Description [15:0] Z-axis accelerometer offset correction, high word, twos complement, 0 g = 0x0000, 1 LSB = 0.8 mg The ZA_BIAS_LOW (see Table 128 and Table 129) and ZA_ BIAS_HIGH (see Table 130 and Table 131) registers combine to allow users to adjust the bias of the z-axis accelerometers. Table 50 and Table 51 offer numerous examples of data format, in both 16-bit and 32-bit formats. See Figure 28 for an illustration of how these two registers combine and influence the z-axis accelerometer measurements. BAROMETERS Calibration, Barometer Bias (BR_BIAS_LOW, BR_BIAS_HIGH) The BR_BIAS_LOW (see Table 132 and Table 133) and BR_ BIAS_HIGH (see Table 134 and Table 135) registers provide a user configurable, bias correction function for the barometer measurement. See Figure 29 for the location and influence that this correction factor has in the barometer signal chain. BAROMETER FACTORY CALIBRATION AND FILTERING BAROM_OUT BAROM_LOW BR_BIAS_HIGH BR_BIAS_LOW Figure 29. User Calibration Signal Path, Accelerometers Table 132. BR_BIAS_LOW Register Definitions Page Addresses Default Access Flash Backup 0x02 0x40, 0x41 0x0000 R/W Yes Table 133. BR_BIAS_LOW Bit Definitions Bits Description [15:0] Barometric pressure bias correction factor, low word Table 134. BR_BIAS_HIGH Register Definitions Page Addresses Default Access Flash Backup 0x02 0x42, 0x43 0x0000 R/W Yes Table 135. BR_BIAS_HIGH Bit Definitions Bits Description [15:0] Barometric pressure bias correction factor, high word, twos complement, ±1.3 bar measurement range, 0 bar = 0x0000, 1 LSB = 40 µbar The digital format examples in Table 56 also apply to the BR_ BIAS_HIGH register and the digital format examples in Table 57 apply to the 32-bit number that comes from combining BR_ BIAS_LOW and BR_BIAS_HIGH. SCRATCH REGISTERS (USER_SCR_x) Table 136. USER_SCR_1 Register Definitions Page Addresses Default Access Flash Backup 0x02 0x74, 0x75 0x0000 R/W Yes Table 137. USER_SCR_1 Bit Definitions Bits Description [15:0] User defined Table 138. USER_SCR_2 Register Definitions Page Addresses Default Access Flash Backup 0x02 0x76, 0x77 0x0000 R/W Yes Table 139. USER_SCR_2 Bit Definitions Bits Description [15:0] User defined Table 140. USER_SCR_3 Register Definitions Page Addresses Default Access Flash Backup 0x02 0x78, 0x79 0x0000 R/W Yes Table 141. USER_SCR_3 Bit Definitions Bits Description [15:0] User defined Table 142. USER_SCR_4 Register Definitions Page Addresses Default Access Flash Backup 0x02 0x7A, 0x7B 0x0000 R/W Yes Table 143. USER_SCR_4 Bit Definitions Bits Description [15:0] User defined The USER_SCR_1 (see Table 136 and Table 137), USER_ SCR_2 (see Table 138 and Table 139), USER_SCR_3 (see Table 140 and Table 141), and USER_SCR_4 (see Table 142 and Table 143) registers provide four locations for users to store information. |
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