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ADIS16385 Datasheet(PDF) 17 Page - Analog Devices |
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ADIS16385 Datasheet(HTML) 17 Page - Analog Devices |
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17 / 20 page  Preliminary Technical Data ADIS16385 Rev. PrA | Page 17 of 20 ALARMS The ADIS16385 provides two independent alarms, Alarm 1 and Alarm 2, which have a number of programmable settings. Table 33 provides a list of registers for these user settings. Table 33. Registers for Alarm Configuration Register Address Description ALM_MAG1 0x26 Alarm 1, trigger setting ALM_MAG2 0X28 Alarm 2, trigger setting ALM_SMPL1 0x2A Alarm 1, sample period ALM_SMPL2 0x2C Alarm 2, sample period ALM_CTRL 0x2E Alarm configuration The ALM_CTRL register in Table 37 provides data source selection (Bits[15:8]), static/dynamic setting for each alarm (Bits[7:6]), trigger polarity (Bits[5:4]), data source filtering (Bit[3]), and alarm indicator signal (Bits[2:0]). Static Alarm Use The static alarms setting compares the data source selection (ALM_CTRL[15:8]) with the values in the ALM_MAGx registers in Table 34 and Table 35. The data format in these registers matches the format of the data selection in ALM_CTRL[15:8]. The ALM_CTRL[5:4] bits provide polarity settings. See Table 38, Alarm 1, for a static alarm configuration example. Table 34. ALM_MAG1 Bit Descriptions Bits Description (Default = 0x0000) [15:0] Threshold setting; matches for format of ALM_CTRL[11:8] selection Table 35. ALM_MAG2 Bit Descriptions Bits Description (Default = 0x0000) [15:0] Threshold setting; matches for format of ALM_CTRL[15:12] selection Dynamic Alarm Use The dynamic alarm setting monitors the data selection for a rate-of-change comparison. The rate-of-change comparison is represented by the magnitude in the ALM_MAGx registers over the time represented by the number-of-samples setting in the ALM_SMPLx registers, located in Table 36. See Table 38, Alarm 2, for a dynamic alarm configuration example. Table 36. ALM_SMPL1 and ALM_SMPL2 Bit Descriptions Bits Description (Default = 0x0000) [15:8] Not used [7:0] Binary, number of samples (both 0x00 and 0x01 = 1) Alarm Reporting The DIAG_STAT[9:8] bits provide error flags that indicate an alarm condition. The ALM_CTRL[2:0] bits provide controls for a hardware indicator using DIO1 or DIO2. Table 37. ALM_CTRL Bit Descriptions Bits Description (Default = 0x0000) [15:12] Alarm 2 data source selection 0000 = disable 0001 = x-axis gyroscope output 0010 = y-axis gyroscope output 0011 = z-axis gyroscope output 0100 = x-axis accelerometer output 0101 = y-axis accelerometer output 0110 = z-axis accelerometer output 0111 = internal temperature output 1000 = auxiliary ADC input 1001 = self test [11:8] Alarm 1 data source selection (same as Alarm 2) [7] Alarm 2, dynamic/static (1 = dynamic, 0 = static) [6] Alarm 1, dynamic/static (1 = dynamic, 0 = static) [5] Alarm 2, polarity (1 = greater than, 0 = less than) [4] Alarm 1, polarity (1 = greater than, 0 = less than) [3] Data source filtering (1 = filtered, 0 = unfiltered) [2] Alarm indicator (1 = enabled, 0 = disabled) [1] Alarm indicator active polarity (1 = high, 0 = low) [0] Alarm output line select (1 = DIO2, 0 = DIO1) Alarm Example Table 38 offers an example that configures Alarm 1 to trigger when filtered ZACCL_OUT data drops below 0.7g, and Alarm 2 to trigger when filtered ZGYRO_OUT data changes by more than 50°/sec over a 100 ms period, or 5,000°/sec2. The filter setting helps reduce false triggers from noise and refine the accuracy of the trigger points. The ALM_SMPL2 setting of 102 samples provides a comparison period that is 99.6 ms for an internal sample rate of 1024 SPS. Because Alarm 1 is a static alarm in this example, there is no need to program ALM_SMPL1. Table 38. Alarm Configuration Example 1 DIN Description 0xAF36, ALM_CTRL = 0x36AF. 0xAEAF Alarm 2: dynamic, Δ-ZGYRO_OUT (Δ-time, ALM_SMPL2) > ALM_MAG2. Alarm 1: static, ZACCL_OUT < ALM_MAG1. Use filtered data source for comparison. DIO2 output indicator, positive polarity. 0xA90F, 0xA8A0 ALM_MAG2 = 0x0FA0 (+50°/sec). 0xA70A, 0xA6F0 ALM_MAG1 = 0x0AF0 (0.7 g). 0xAC76 ALM_SMPL2[7:0] = 0x66 (102 samples). |
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