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CS43130 Datasheet(PDF) 87 Page - Cirrus Logic

Part # CS43130
Description  130-dB, 32-Bit High-Performance DAC with Integrated Headphone Driver
PDF  137 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS43130 Datasheet(HTML) 87 Page - Cirrus Logic

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DS1073F1
87
CS43130
5.11 Headphone Load Measurement
5.11.3 Measuring AC Impedance at 1 kHz
Fig. 5-4 shows and Ex. 5-22 describes the steps necessary to measure AC impedance at 1 kHz with the following
assumptions:
• Continuing from Step 11 of Ex. 5-21 since DC impedance measurement is required to be run before AC impedance
measurement.
Figure 5-4. AC Impedance Measurement Flowchart
Example 5-22. AC Impedance Measurement at 1 kHz
STEP
TASK
REGISTER/BIT FIELDS
VALUE
DESCRIPTION
1
Enable impedance measurement subsystem. Refer to Ex. 5-20.
2
Check if DC impedance was already measured. Read HP Load Status (0xE001A) and verify HPLOAD_DC_ONCE (bit 8) is set.
3
Measure headphone AC impedance
4
Select Channel A
0x10010
0x99
0x10026
0x0A
0x10027
0x93
0x10028
0x0A
0x10010
0x00
HP Load 1. 0xE0000
0x80
HPLOAD_EN
Reserved
HPLOAD_CHN_SEL
Reserved
HPLOAD_AC_START
HPLOAD_DC_START
1
00
0
00
0
0
HPOUTA selected
Select Channel A
0x10010 = 0x99
0x10026 = 0x0A
0x10027 = 0x93
0x10028 = 0x0A
0x10010 = 0x00
HPLOAD_ CHN_SEL = 0 (Channel A)
HPLOAD _AC_START = 0 (Stop)
Enable DC impedance measurement
HPLOAD _AC_START = 1
HPLOAD_ AC_DONE_INT
= 1?
HPLOAD_ UNPLUG_INT
= 1?
HPLOAD_OOR _INT
= 1?
Read AC impedance
value from
RL_AC_STAT_0 and
RL_AC_STAT_ 1
YES
NO
NO
Assumptions
DAC Response
User Commands
AC Impedance Measurement
Disable Impedance Measurement Subsystem
NO
Select Channel B
0x10010 = 0x99
0x10026 = 0x8A
0x10027 = 0x15
0x10028 = 0x06
0x10010 = 0x00
HPLOAD_ CHN_SEL = 1 (Channel B )
HPLOAD _AC_START = 0 (Stop)
New
Measurement?
YES
Channel ?
B
A
Enable Impedance Measurement
Subsystem has already been run.
DC Impedance Measurement has
already been run at least once.
DC Impedance Measurement
HPLOAD _DC_ ONCE
= 1?
YES
NO
Set Frequency
HPLOAD_MEAS _FREQ_LSB = 0x??
HPLOAD _MEAS_FREQ_MSB = 0x??
YES
Error Occurred
NO
YES
Disable Impedance Measurement
Subsystem
HPLOAD_UNPLUG_ INT
= 1?
YES
NO



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