CS3318 datasheet(22/44 Pages) CIRRUS

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DS693F1

CS3318

5.7

Zero-Crossing Detection

The CS3318 incorporates comprehensive zero-crossing detection features to provide for noise-free level

transitions. Three zero-crossing detection modes and 8 selectable time-out periods are available for en-

hanced flexibility. Zero-crossing detection and time-out is implemented independently for each channel.

5.7.1

Zero-Crossing Modes

The zero-crossing mode for all channels within the CS3318 are configured via the ZCMode[1:0] bits in the

Device Config 2 register. By default, zero-crossing mode 1 is selected. The zero-crossing modes are de-

tailed in Table 2.

5.7.2

Zero-Crossing Time-Out

When in zero-crossing mode 1 or 2, the zero-crossing time-out period dictates how long the CS3318 will

wait for a signal zero-crossing before implementing the requested volume change without a zero-cross-

ing, thereby allowing the possibility of audible artifacts. The CS3318 provides 8 selectable time-out peri-

ods ranging from 5 ms to 50 ms; these are shown in Table 3.

The zero-crossing time-out period for all channels within the CS3318 is configured via the TimeOut[2:0]

bits in the Device Config 2 register. The time-out period is set to 18 ms (setting 3) by default.

Mode

Zero-Crossing Function

Volume changes take effect immediately.

Volume changes take effect on a signal zero-crossing. If a zero-crossing is not detected before the time-

out period has elapsed, the volume change will be implemented immediately when the time-out period

elapses. If the volume setting is changed again before the original volume change has been imple-

mented, the original change will be discarded, the time-out period will be reset, and the new volume set-

ting will take effect when a zero-crossing is detected or the time-out period elapses.

Volume changes take effect on a signal zero-crossing. If a zero-crossing is not detected before the time-

out period has elapsed, the volume change will be implemented immediately when the time-out period

elapses. If the volume setting is changed again before the original volume change has been imple-

mented, the original volume change will be implemented immediately upon reception of the new volume

change command, the time-out period will be reset, and the new volume setting will take effect when a

zero-crossing is detected or the time-out period elapses.

Table 2. Zero-Crossing Modes

Referenced Control

ZCMode[1:0] ....................... “Zero-Crossing Mode (Bits 1:0)” on page 35

Time-Out Setting

Time-Out Period

05 ms

110 ms

215 ms

318 ms

420 ms

530 ms

640 ms

750 ms

Table 3. Zero-Crossing Time-Out Periods

Referenced Control

TimeOut[2:0] ....................... “Zero-Crossing Time-Out Period (Bits 4:2)” on page 34

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