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CS43130 Datasheet(PDF) 88 Page - Cirrus Logic |
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CS43130 Datasheet(HTML) 88 Page - Cirrus Logic |
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88 / 137 page  88 DS1073F1 CS43130 5.11 Headphone Load Measurement 5 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 6 Enable AC impedance measurement HP Load 1. 0xE0000 0x82 HPLOAD_EN Reserved HPLOAD_CHN_SEL Reserved HPLOAD_AC_START HPLOAD_DC_START 1 00 0 00 1 0 Start AC impedance measurement 7 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. 8 AC impedance values are available in HP AC Load Status 0 (0xE0010) and HP AC Load Status 1 (0xE0011) registers. 9 Disable AC impedance measurement HP Load 1. 0xE0000 0x80 HPLOAD_EN Reserved HPLOAD_CHN_SEL Reserved HPLOAD_AC_START HPLOAD_DC_START 1 00 0 00 0 0 Stop AC impedance measurement 10 Select Channel B 0x10010 0x99 0x10026 0x0A 0x10027 0x93 0x10028 0x0A 0x10010 0x00 HP Load 1. 0xE0000 0x90 HPLOAD_EN Reserved HPLOAD_CHN_SEL Reserved HPLOAD_AC_START HPLOAD_DC_START 1 00 1 00 0 0 HPOUTB selected 11 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 12 Enable 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 13 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. 14 AC impedance values are available in HP AC Load Status 0 (0xE0010) and HP AC Load Status 1 (0xE0011) registers. 15 Disable impedance measurement subsystem. Refer to Ex. 5-23. Example 5-22. AC Impedance Measurement at 1 kHz (Cont.) STEP TASK REGISTER/BIT FIELDS VALUE DESCRIPTION |
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