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ADIS16385 Datasheet(PDF) 10 Page - Analog Devices |
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ADIS16385 Datasheet(HTML) 10 Page - Analog Devices |
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10 / 20 page  ADIS16385 Preliminary Technical Data Rev. PrA | Page 10 of 20 OUTPUT DATA REGISTERS The output registers in Table 8 provide the most recent sensor data produced by the ADIS16385. All of the inertial sensor outputs use a 16-bit, twos complement, data format. Figure 6 provides arrows that describe the direction of motion, which produces a positive output in each inertial sensor’s output data register. Table 8. Output Data Register Formats Register Address Measurement Format XGYRO_OUT1 0x04 Gyroscope, x-axis Table 9 YGYRO_OUT1 0x06 Gyroscope, y-axis Table 9 ZGYRO_OUT1 0x08 Gyroscope, z-axis Table 9 XACCL_OUT 0x0A Accelerometer, x-axis Table 10 YACCL_OUT 0x0C Accelerometer, y-axis Table 10 ZACCL_OUT 0x0E Accelerometer, z-axis Table 10 TEMP_OUT2 0x10 Internal Temperature Table 11 AUX_ADC 0x12 Auxiliary ADC Table 12 1 Assumes that the scaling is set to ±300°/sec. This factor scales with the range. 2 This is most useful for monitoring relative changes in the temperature. Table 9. Rotation Rate, Twos Complement Format Rotation Rate Decimal Hex Binary +300°/sec +24000 0x5DC0 0101 1101 1100 0000 +0.025°/sec +2 0x0002 0000 0000 0000 0010 +0.0125°/sec +1 0x0001 0000 0000 0000 0001 0°/sec 0 0x0000 0000 0000 0000 0000 −0.0125°/sec −1 0xFFFF 1111 1111 1111 1111 −0.025°/sec −2 0xFFFE 1111 1111 1111 1110 −300°/sec −24000 0xA240 1010 0010 0100 0000 Table 10. Acceleration, Twos Complement Format Acceleration Decimal Hex Binary +5 g +20000 0x4E20 0100 1110 0010 0000 +0.5 mg +2 0x0002 0000 0000 0000 0010 +0.25 mg +1 0x0001 0000 0000 0000 0001 0 g 0 0x0000 0000 0000 0000 0000 −0.25 mg −1 0xFFFF 1111 1111 1111 1111 −0.5 mg −2 0xFFFE 1111 1111 1111 1110 −5 g − 20000 0xB1E0 1011 0001 1110 0000 Table 11. Temperature, Twos Complement Format Temperature Decimal Hex Binary +105°C +1180 0x49C XXXX 0100 1001 1100 +25.1356°C +2 0x002 XXXX 0000 0000 0010 +25.0678°C +1 0x001 XXXX 0000 0000 0001 +25°C 0 0x000 XXXX 0000 0000 0000 +24.9322°C −1 0xFFF XXXX 1111 1111 1111 +24. 8644°C −2 0xFFE XXXX 1111 1111 1110 −40°C −959 0xC41 XXXX 1100 0100 0001 Table 12. Analog Input, Offset Binary Format Input Voltage Decimal Hex Binary 3.3 V 4095 0xFFF XXXX 1111 1111 1111 1 V 1241 0x4D9 XXXX 0100 1101 1001 1.6116 mV 2 0x002 XXXX 0000 0000 0010 805.9 μV 1 0x001 XXXX 0000 0000 0001 0 V 0 0x000 XXXX 0000 0000 0000 DEVICE CONFIGURATION The control registers in Table 13 provide users with a variety of configuration options. The SPI provides access to these registers, one byte at a time, using the bit assignments in Figure 14. Each register has 16-bits, where bits [7:0] represent the lower address and Bits[15:8] represent the upper address. Figure 15 provides an example of writing 0x03 to Address 0x36 (SMPL_PRD[15:8]), using DIN = 0xB703. This example reduces the sample rate by a factor of eight (see Table 28). Figure 15. Example SPI Write Sequence Dual Memory Structure Writing configuration data to a control register updates its SRAM contents, which are volatile. After optimizing each relevant control register setting in a system, set GLOB[12] = 1 (DIN = 0xBF10) to back these settings up in nonvolatile flash memory. The flash back- up process requires a valid power supply level for the entire 75 ms process time. Table 13 provides a user register memory map that includes a flash back-up column. A yes in this column indicates that a register has a mirror location in flash, and when backed up properly, it automatically restores itself during start-up or after a reset. Figure 16 provides a diagram of the dual-memory structure used to manage operation and store critical user settings. NONVOLATILE FLASH MEMORY (NO SPI ACCESS) MANUAL FLASH BACKUP START-UP RESET VOLATILE SRAM SPI ACCESS Figure 16. SRAM and Flash Memory Diagram |
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