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ADIS16489 Datasheet(PDF) 16 Page - Analog Devices |
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ADIS16489 Datasheet(HTML) 16 Page - Analog Devices |
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16 / 40 page  ADIS16489 Data Sheet Rev. B | Page 16 of 40 USER REGISTER DEFINTIONS PAGE 0 (PAGE_ID) Table 11. PAGE_ID Register Definition Page Addresses Default Access Flash Backup 0x00 0x00, 0x01 0x0000 R/W No Table 12. PAGE_ID Bit Definitions Bits Description [15:0] Page number, binary numerical format The contents in the PAGE_ID register (see Table 11 and Table 12) contain the current page setting, and provide a control for selecting another page for SPI access. For example, set DIN = 0x8002 to select Page 2 for SPI-based user access. See Table 10 for the page assignments associated with each user accessible register. SAMPLE SEQUENCE COUNTER (SEQ_CNT) When using the internal sampling clock, the barometer output data registers (BAROM_LOW and BAROM_OUT, see Table 53 and Table 55) update at a rate of 51.25 SPS. When using the external clock, the barometers update at a rate that is 1/48th of the input clock frequency. Therefore, the update rates for the barometer does not change with the DEC_RATE register settings. SYS_E_FLAG[9] (see Table 16) offers a new data indicator bit that indicates new, unread data is in the barometer output data registers. The SEQ_CNT register provides a counter function to help determine when there is new data in the barometer registers. When SEQ_CNT = 0x0001, there is new data in the barometer output registers. When beginning a continuous read loop, read SEQ_CNT, then subtract this value from the maximum value of the range (depends on DEC_RATE setting; see Table 14) to predict the number of internal sample cycles until the next sample update in the barometer output data registers. Table 13. SEQ_CNT Register Definition Page Addresses Default Access Flash Backup 0x00 0x06, 0x07 Not applicable R No Table 14. SEQ_CNT Bit Definitions Bits Description [15:7] Don’t care [6:0] Binary counter: range = 1 to 48/(DEC_RATE + 1) STATUS/ERROR FLAG INDICATORS (SYS_E_FLAG) The SYS_E_FLAG register (see Table 15 and Table 16) provides various error flags. Reading this register causes all of its bits to return to 0, with the exception of Bit 7. If an error condition persists, its flag (bit) automatically returns to an alarm value of 1. Table 15. SYS_E_FLAG Register Definition Page Addresses Default Access Flash Backup 0x00 0x08, 0x09 0x0000 R No Table 16. SYS_E_FLAG Bit Definitions Bits Description 15 Watch dog timer flag. A 1 indicates that the ADIS16489 automatically reset itself to clear an issue. [14:13] Not used. 12 Gyroscope saturation. A 1 indicates that the rate of rotation on one axis is equal to or greater than ±480°/sec (±1 % tolerance). [11:10] Not used. 9 Barometer sample update. A 1 indicates that BAROM_OUT (see Table 55) and BAROM_LOW (see Table 53) registers contain new data. 8 Not used. 7 Processing overrun. A 1 indicates the occurrence of a processing overrun. Initiate a reset to recover. Replace the ADIS16489 if this error persists. One possible cause of a processing overrun error is the VDDRTC pin not being connected to a 3.3 V power supply. 6 Flash memory failure. A 1 indicates that the most recent flash memory test (GLOB_CMD[2], see Table 151) failed. Repeat test and replace the ADIS16489 if this error persists. 5 Sensor failure. A 1 indicates the failure of at least one of the self-test processes: continuous or on demand. Run the ODST (GLOB_CMD, Bit 1, see Table 151) when the unit is in not in motion. Replace the ADIS16489 if the error persists. 4 Overrange. A 1 indicates that the digital magnitude of at least one sensor has reached 99% of its maximum value. Initiate a reset to recover and replace the ADIS16489 if this error persists. 3 SPI communication error. A 1 indicates that the total number of SCLK cycles is not equal to an integer multiple of 16. Repeat the previous communication sequence to recover. Persistence in this error may indicate a weakness in the SPI service from the master processor. [2:1] Not used. 0 Alarm status flag. A 1 indicates that one of the user- programmable alarms is active. See the ALM_STS register for an indication of which alarm is active. SELF TEST ERROR FLAGS (DIAG_STS) Table 17. DIAG_STS Register Definition Page Addresses Default Access Flash Backup 0x00 0x0A, 0x0B 0x0000 R No |
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