CS42L55 datasheet(36/73 Pages) CIRRUS

36 / 73 page

DS773F1

CS42L55

4.11.1

Recommended Power-Down Sequence

To minimize pops on the headphone or line amplifier, each respective analog volume control must

first be muted and set to maximum attenuation.

Set the PDN bit to ‘1’b.

Bring RESET low.

4.12

Recommended PGA to HP or Line Power-Up Sequence (Analog Passthrough)

Hold RESET low until the power supplies are stable; no specific power supply sequencing is required.

RESET should be held low for a minimum of 1 ms after power supplies are stable.

Apply MCLK at the appropriate frequency.

Bring RESET high.

Wait a minimum of 500 ns before writing to the control port.

The default state of the master power down bit, PDN, is ‘1’b. Load the following register settings while

keeping the PDN bit set to ‘1’b.

Load the required register settings detailed in 4.13 “Required Initialization Settings” on page 37.

Configure the headphone and line power down controls for ON, OFF, or HPDETECT operation.

Configure the HP and/or Line amplifiers to receive the analog output from the PGA.

Power down the DSP engine.

10. To minimize pops on the headphone or line amplifier, each respective analog volume control must first

be muted and set to maximum attenuation.

11. After muting the headphone and/or line amplifiers, set the PDN bit to ‘0’b.

12. Wait 75 ms for the headphone or line amplifier to power up.

13. Un-mute and ramp the volume for the headphone or line amplifiers to the desired level.

14. Bring RESET low if the analog or digital supplies drop below the recommended operating condition to

prevent power glitch related issues.

4.12.1

Recommended Power-Down Sequence

To minimize pops on the headphone and/or line amplifier, each respective analog volume control

must first be muted and set to maximum attenuation.

During power down, the CODEC attempts to power down on a zero cross transition of the analog

Power Down Sequence

Step 1a ................................

Step 1b ................................

Step 2 ..................................

“Headphone Volume Control” on page 57, “Line Volume Control” on page 58

“Headphone Channel x Mute” on page 57, “Line Channel x Mute” on page 58

“Power Down” on page 42

Power Up Sequence

Step 5, 11 ............................

Step 7 ..................................

Steps 8 ................................

Step 9 ..................................

Step 10a,13a .......................

Step 10b,13b .......................

“Power Down” on page 42

“Power Control 2 (Address 03h)” on page 43

“ADC, Line, HP MUX (Address 08h)” on page 46

“Power Down DSP” on page 50

“Headphone Channel x Mute” on page 57, “Line Channel x Mute” on page 58

“Headphone Volume Control” on page 57, “Line Volume Control” on page 58

CS42L55 Datasheet(PDF) 36 Page - Cirrus Logic

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