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CS43131 Datasheet(PDF) 100 Page - Cirrus Logic

Part # CS43131
Description  130-dB, 32-Bit High-Performance DAC with Integrated Headphone Driver and Impedance Detection
PDF  156 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS43131 Datasheet(HTML) 100 Page - Cirrus Logic

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DS1155F1
CS43131
5.14 Headphone Load Measurement
5.14.1 Measuring Only DC Impedance
Fig. 5-1 shows and Ex. 5-19 describes the steps necessary for measuring DC impedance with the following assumptions:
• The CS43131 is already powered up and out of reset.
• MCLK_INT is 22.5792 or 24.576 MHz sourced from MCLK/XTAL or PLL (MCLK_SRC_SEL = 00 or 01).
• HP_IN_EN = 0 and HPLOAD_EN = 0.
• A headphone is already plugged in and HPDETECT_PLUG_INT = 1.
Figure 5-1. DC Impedance Measurement Flowchart
Start DC impedance measurement
HPLOAD_DC_START = 1
HPLOAD_DC_DONE_INT
= 1?
HPLOAD _UNPLUG_INT
= 1?
HPLOAD_OOR_INT
= 1?
Read DC impedance
value from
RL_DC_STAT_0 and
RL_DC_STAT_1
YES
Error Occurred
YES
NO
NO
YES
DAC Response
User Commands
DC Impedance Measurement
NO
New
Measurement?
YES
HPLOAD_UNPLUG_INT
= 1?
YES
NO
Enable HP Load Interrupts. Set Interrupt
Mask 4 (0xF0013) to 0x00
Read Interrupt Status 4
Enable impedance subsystem
HPLOAD _EN = 1
Disable Impedance Measurement
Subsystem
HPLOAD _EN = 0
HPLOAD_ON_INT
= 1?
YES
NO
HPLOAD _HPON_INT
= 1?
NO
YES
Disable HP Load Interrupts. Set Interrupt
Mask 4 (0xF0013) to 0xFF.
YES
HPLOAD _OFF_INT
= 1?
NO
NO
Select Channel A or B
HPLOAD_EN = 0 (Disabled)
HPLOAD_CHN_SEL = X (Channel A/B)
HPLOAD_DC_START = 0 (Stop)
HPLOAD _AC_START = 0 (Stop)
YES
Stop DC impedance measurement
HPLOAD_DC_START = 0
New Measurement
on same channel?
NO



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