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ADIS16IMU1/PCBZ Datasheet(PDF) 31 Page - Analog Devices |
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ADIS16IMU1/PCBZ Datasheet(HTML) 31 Page - Analog Devices |
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31 / 38 page  Data Sheet ADIS16486 Rev. 0 | Page 31 of 38 Bits Description (Default = 0x0000) 3 X-axis gyroscope. 0: alarm is off, and 1: alarm is on. 2 Not used. 1:0 X-axis gyroscope polarity and mode settings. Select one of the four options for the condition that triggers the alarm flag (ALM_STS, Bit 0 = 1, see Table 24). 00: X_GYRO_OUT < XG_ALM_MAGN. 01: ΔX_GYRO_OUT < XG_ALM_MAGN (see Equation 5). 10: X_GYRO_OUT > XG_ALM_MAGN. 11: ΔX_GYRO_OUT > XG_ALM_MAGN (see Equation 5). Table 160. ALM_CNFG_1 Register Definition Page ID Addresses Default Access Flash Backup 0x03 0x22, 0x23 0x0000 R/W Yes Table 161. ALM_CNFG_1 Bit Definitions Bits Description (Default = 0x0000) [15:8] Not used. 7 Z-axis accelerometer. 0: alarm is off, and 1: alarm is on. 6 Not used. [5:4] Z-axis accelerometer polarity and mode settings. Select one of the four options for the condition that triggers the alarm (ALM_STS, Bit 5 = 1, see Table 24). 00: Z_ACCL_OUT < ZA_ALM_MAGN. 01: ΔZ_ACCL_OUT < ZA_ALM_MAGN (see Equation 6). 10: Z_ACCL_OUT > ZA_ALM_MAGN. 11: ΔZ_ACCL_OUT > ZA_ALM_MAGN (see Equation 6). 4 Z-axis accelerometer mode. 0: static, and 1: dynamic. 3 Y-axis accelerometer. 0: alarm is off, and 1: alarm is on. 2 Not used. [1:0] Y-axis accelerometer polarity and mode settings. Select one of the four options for the condition that triggers the alarm (ALM_STS, Bit 4 = 1, see Table 24). 00: Y_ACCL_OUT < YA_ALM_MAGN. 01: ΔY_ACCL_OUT < YA_ALM_MAGN (see Equation 7). 10: Y_ACCL_OUT > YA_ALM_MAGN. 11: ΔY_ACCL_OUT > YA_ALM_MAGN (see Equation 7). X-Axis Gyroscope Alarm, XG_ALM_MAGN The XG_ALM_MAGN register (see Table 162 and Table 163) contains the alarm threshold for the x-axis gyroscope when ALM_CNFG_0, Bit 3 = 1 (see Table 159). This alarm is associated with the alarm flag in ALM_STS, Bit 0 (see Table 24). Table 162. XG_ALM_MAGN Register Definition Page ID Addresses Default Access Flash Backup 0x03 0x28, 0x29 0x0000 R/W Yes Table 163. XG_ALM_MAGN Bit Definition Bits Description (Default = 0x0000) [15:0] X-axis gyroscope alarm threshold settings, twos complement, 0°/sec = 0x0000, 1 LSB = 0.02°/sec Alarm Example Use the following sequence to configure the x-axis gyroscopes alarm to be active (ALM_STS, Bit 0 = 1) when the rate of rotation around the x-axis exceeds 100°/sec: 1. Select Page 3 (DIN = 0x8003). 2. Set XG_ALM_MAGN, Bits[7:0] = 0x88 (DIN = 0xA888). 3. Set XG_ALM_MAGN, Bits[15:8] = 0x13 (DIN = 0xA913). 4. Set ALM_CNFG_1, Bits[7:0] = 0x0C (DIN = 0xA00C). 5. Set ALM_CNFG_1, Bits[15:8] = 0x00 (DIN = 0xA100). The value for the XG_ALM_MAGN register is 0x1388, as shown in the equation 100°/sec ÷ 0.02°/sec/LSB = 5000 LSB = 0x1388 Y-Axis Gyroscope Alarm, YG_ALM_MAGN The YG_ALM_MAGN register (see Table 164 and Table 165) contains the alarm threshold for the y-axis gyroscope when ALM_CNFG_0, Bit 7 = 1 (see Table 159). This alarm is associated with the alarm flag in ALM_STS, Bit 1 (see Table 24). Table 164. YG_ALM_MAGN Register Definition Page ID Addresses Default Access Flash Backup 0x03 0x2A, 0x2B 0x0000 R/W Yes Table 165. YG_ALM_MAGN Bit Definition Bits Description (Default = 0x0000) [15:0] Y-axis gyroscope alarm threshold settings, twos complement, 0°/sec = 0x0000, 1 LSB = 0.02°/sec Z-Axis Gyroscope Alarm, ZG_ALM_MAGN The ZG_ALM_MAGN register (see Table 166 and Table 167) contains the alarm threshold for the z-axis gyroscope when ALM_CNFG_0, Bit 11 = 1 (see Table 159). This alarm is associated with the alarm flag in ALM_STS, Bit 2 (see Table 24). Table 166. ZG_ALM_MAGN Register Definition Page ID Addresses Default Access Flash Backup 0x03 0x2C, 0x2D 0x0000 R/W Yes Table 167. ZG_ALM_MAGN Bit Definition Bits Description (Default = 0x0000) [15:0] Z-axis gyroscope alarm threshold settings, twos complement, 0°/sec = 0x0000, 1 LSB = 0.02°/sec X-Axis Accelerometer Alarm, XA_ALM_MAGN The XA_ALM_MAGN register (see Table 168 and Table 169) contains the alarm threshold for the x-axis accelerometer when ALM_CNFG_0, Bit 15 = 1 (see Table 159). This alarm is associated with the alarm flag in ALM_STS, Bit 3 (see Table 24). Table 168. XA_ALM_MAGN Register Definition Page ID Addresses Default Access Flash Backup 0x03 0x2E, 0x2F 0x0000 R/W Yes Table 169. XA_ALM_MAGN Bit Definition Bits Description (Default = 0x0000) [15:0] X-axis accelerometer alarm threshold settings, twos complement, 0 g = 0x0000, 1 LSB = 0.8 mg |
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