CS42L52 datasheet(31/82 Pages) CIRRUS

31 / 82 page

DS680A1

CS42L52

4.3.2

Limiter

When enabled, the limiter monitors the digital input signal before the DAC and PWM modulators, detects

when levels exceed the maximum threshold settings and lowers the master volume at a programmable

attack rate below the maximum threshold. When the input signal level falls below the maximum threshold,

the AOUT volume returns to its original level set in the Master Volume Control register at a programmable

release rate. Attack and release rates are affected by the DAC soft ramp/zero cross settings and sample

rate, Fs. Limiter soft ramp and zero cross dependency may be independently enabled/disabled.

Notes:

1. Recommended settings: Best limiting performance may be realized with the fastest attack and

slowest release setting with soft ramp enabled in the control registers. The MIN bits allow the user to

set a threshold slightly below the maximum threshold for hysteresis control - this cushions the sound

as the limiter attacks and releases.

2. The Limiter maintains the output signal between the MIN and MAX thresholds. As the digital input

signal level changes, the level-controlled output may not always be the same but will always fall within

the thresholds.

Referenced Control

MSTxVOL[7:0].....................

PMIXxVOL[6:0] ...................

OFFTIME[2:0] .....................

ONTIME[3:0] .......................

FREQ[3:0] ...........................

BEEP[1:0]............................

BEEPMIXDIS ......................

BPVOL[4:0] .........................

“Master Volume Control: MSTA (Address 20h) & MSTB (Address 21h)” on page 63

“PCMx Mixer Volume: PCMA (Address 1Ah) & PCMB (Address 1Bh)” on page 58

“Beep Off Time” on page 60

“Beep On Time” on page 60

“Beep Frequency” on page 59

“Beep Configuration” on page 61

“Beep Mix Disable” on page 61

“Beep Volume” on page 61

Referenced Control

Limiter Controls ...................

Master Volume Control........

“Limiter Control 2, Release Rate (Address 28h)” on page 66, “Limiter Attack Rate (Address 29h)” on page 67

“Master Volume Control: MSTA (Address 20h) & MSTB (Address 21h)” on page 63

FREQ[3:0]

...

BPVOL[4:0]

ONTIME[3:0]

OFFTIME[2:0]

BEEP[1:0] =

'01'

BEEP[1:0] =

'10'

BEEP[1:0] =

'11'

SINGLE-BEEP: Beep turns on at a

configurable frequency (FREQ) and

volume (BPVOL) for the duration of

ONTIME. BEEP must be cleared

and set for additional beeps.

MULTI-BEEP: Beep turns on at a configurable frequency (FREQ)

and volume (BPVOL) for the duration of ONTIME and turns off for

the duration of OFFTIME. On and off cycles are repeated until

BEEP is cleared.

CONTINUOUS BEEP: Beep turns on at a configurable frequency (FREQ) and volume (BPVOL) and remains on

until BEEP is cleared.

Figure 13. Beep Configuration Options

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