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CS43131 Datasheet(PDF) 105 Page - Cirrus Logic |
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CS43131 Datasheet(HTML) 105 Page - Cirrus Logic |
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105 / 156 page  DS1155F1 105 CS43131 5.14 Headphone Load Measurement 19 Start DC impedance measurement HP Load 1. 0xE0000 0x91 HPLOAD_EN Reserved HPLOAD_CHN_SEL Reserved HPLOAD_AC_START HPLOAD_DC_START 1 00 1 00 0 1 HPOUTB selected Start DC impedance measurement 20 Wait for interrupt. Read Interrupt Status 4 register (0xF0003). If HPLOAD_UNPLUG_INT = 1, go to the last step as an error has occurred. If HPLOAD_OOR_INT = 1, go to the last step as an error has occurred. Otherwise, if HPLOAD_DC_DONE_INT = 1, go to the next step. 21 DC impedance values are available in HP DC Load Status 0 (0xE000D) and HP DC Load Status 1 (0xE000E) registers. 22 Set HP load measurement frequency to desired frequency. Assuming 1 kHz. HP Load Measurement 1. 0xE0003 0xA8 HPLOAD_MEAS_FREQ_LSB 0xA8 Set measurement frequency = 1 kHz HP Load Measurement 2. 0xE0004 0x00 HPLOAD_MEAS_FREQ_MSB 0x00 MSB of load measurement frequency 23 Start AC impedance measurement HP Load 1. 0xE0000 0x92 HPLOAD_EN Reserved HPLOAD_CHN_SEL Reserved HPLOAD_AC_START HPLOAD_DC_START 1 00 1 00 1 0 HPOUTB selected Start AC impedance measurement 24 Wait for interrupt. Read Interrupt Status 4 register (0xF0003). If HPLOAD_UNPLUG_INT = 1, go to the last step as an error has occurred. If HPLOAD_OOR_INT = 1, go to the last step as an error has occurred. Otherwise, if HPLOAD_AC_DONE_INT = 1, go to the next step. 25 AC impedance values are available in HP AC Load Status 0 (0xE0010) and HP AC Load Status 1 (0xE0011) registers. 26 Stop AC impedance measurement. HP Load 1. 0xE0000 0x90 27 If another frequency point is desired go back to step 22. Otherwise continue. 28 Disable impedance measurement subsystem and select channel B HP Load 1. 0xE0000 0x00 29 Wait for interrupt. Check if HPLOAD_OFF_INT = 1 in Interrupt Status 4 register (0xF0003). 30 Disable HP Load Interrupts Interrupt Mask 4. 0xF0013 0xFF Example 5-20. AC and DC Impedance Measurement (Cont.) STEP TASK REGISTER/BIT FIELDS VALUE DESCRIPTION |
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