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CS43131 데이터시트(PDF) 105 Page - Cirrus Logic

부품명 CS43131
상세설명  130-dB, 32-Bit High-Performance DAC with Integrated Headphone Driver and Impedance Detection
PDF  156 Pages
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제조업체  CIRRUS [Cirrus Logic]
홈페이지  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS43131 데이터시트(HTML) 105 Page - Cirrus Logic

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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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