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ADIS16489 Datasheet(PDF) 31 Page - Analog Devices |
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ADIS16489 Datasheet(HTML) 31 Page - Analog Devices |
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31 / 40 page  Data Sheet ADIS16489 Rev. B | Page 31 of 40 POWER MANAGEMENT (SLP_CNT) Table 162. SLP_CNT Register Definitions Page Addresses Default Access Flash Backup 0x03 0x10, 0x11 Not applicable W No Table 163. SLP_CNT Bit Definitions Bits Description [15:10] Not used 9 Power-down mode 8 Normal sleep mode [7:0] Programmable time bits; 1 sec/LSB; 0x00 = indefinite The SLP_CNT register (see Table 162 and Table 163) provides controls for both power-down mode and sleep modes. The trade-off between power-down mode and sleep mode is idle power and recovery time. Power-down mode offers the best power consumption but requires the most time to recover. In addition, all volatile settings are lost during power-down, whereas sleep mode preserves these settings. To initiate a sleep mode for a specific period of time, turn to Page 3 (DIN = 0x8003), write the amount of sleep time to SLP_ CNT[7:0] and then set SLP_CNT[8] = 1 (DIN = 0x9101) to start the sleep period. Sleep mode begins when the CS line goes high, after setting SLP_CNT[8] = 1. See Table 164 for a command sequence example to place the ADIS16489 into sleep mode for 100 sec. Table 164. Command Sequence, Timed Sleep Mode Example DIN Description 0x8003 Turn to Page 3 0x9064 SLP_CNT[7:0] = 0x64, 100 sec sleep time 0x9101 SLP_CNT[8] = 1, start sleep mode To initiate an indefinite sleep mode, set SLP_CNT[7:0] = 0x00 (DIN = 0x9000), then set SLP_CNT[8] = 1 (DIN = 0x9101). To initiate a power-down period of 100 sec, use the configuration sequence in Table 164, with one exception: set SLP_CNT[9] = 1 (DIN = 0x9102) instead of setting SLP_CNT[8] = 1 (DIN = 0x9101). To initiate an indefinite power-down, set SLP_CNT[7:0] = 0x00 first, and then set SLP_CNT[9] = 1 (DIN = 0x9102). To wake the device from sleep or power-down mode, use one of the following options to restore normal operation: • Assert CS from high to low. • Pulse RST low, then high again. • Cycle the power. If the sleep mode and power-down mode bits are both set high, the normal sleep mode bit (SLP_CNT[8]) takes precedence. FIR FILTER CONTROL (FILTR_BNK_0, FILTR_BNK_1) Table 165. FILTR_BNK_0 Register Definitions Page Addresses Default Access Flash Backup 0x03 0x16, 0x17 0x0000 R/W Yes Table 166. FILTR_BNK_0 Bit Definitions Bits Description 15 Don’t care 14 Y-axis accelerometer filter enable (1 = enabled) [13:12] Y-axis accelerometer filter bank selection: 00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D 11 X-axis accelerometer filter enable (1 = enabled) [10:9] X-axis accelerometer filter bank selection: 00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D 8 Z-axis gyroscope filter enable (1 = enabled) [7:6] Z-axis gyroscope filter bank selection: 00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D 5 Y-axis gyroscope filter enable (1 = enabled) [4:3] Y-axis gyroscope filter bank selection: 00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D 2 X-axis gyroscope filter enable (1 = enabled) [1:0] X-axis gyroscope filter bank selection: 00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D Table 167. FILTR_BNK_1 Register Definitions Page Addresses Default Access Flash Backup 0x03 0x18, 0x19 0x0000 R/W Yes Table 168. FILTR_BNK_1 Bit Definitions Bits Description [15:3] Don’t care 2 Z-axis accelerometer filter enable (1 = enabled) [1:0] Z-axis accelerometer filter bank selection: 00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D The FILTR_BNK_0 (see Table 165 and Table 166) and FILTR_ BNK_1 (see Table 167 and Table 168) registers provide the configuration controls for the FIR filter bank in the signal chain of each sensor (see Figure 33). These registers provide on/off control for the FIR bank for each inertial sensor, along with the FIR bank (A, B, C, D) that each sensor uses. ALARM CONFIGURATION (ALM_CNFG_0, ALM_CNFG_1, ALM_CFG_2) The ALM_CNFG_0 (see Table 169 and Table 170), ALM_ CNFG_1 (see Table 171 and Table 172) and ALM_CNFG_2 (see Table 173 and Table 174) registers provide three configuration control options for the alarm functions of each inertial sensor and the barometer: on/off, polarity, and mode of operation (static/dynamic). Table 169. ALM_CNFG_0 Register Definitions Page Addresses Default Access Flash Backup 0x03 0x20, 0x21 0x0000 R/W Yes |
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