ACS32201 datasheet(39/65 Pages) IDT

39 / 65 page

IDT CONFIDENTIAL

V0.6 07/11

ACS32201

LOW-POWER, HIGH-FIDELITY, CLASS-D AMPLIFIER

3.16.3. Temperature Limit State Diagram:

Figure 14. Temp sense volume adjustment algorithm

3.16.4. Instant Cut Mode

This mode can be used to make our algorithm react faster to reduce thermal output but will cause

more pronounced volume changes. If enabled:

•

Only the high overheat is used, the low overheat is ignored.

•

Whenever polled, if the high overheat is 1, then the volume setting will immediately be set to 0h.

•

Conversely, if the high overheat is 0, the volume setting will immediately be set to the MaxVol

value.

•

Both volume clear and volume set events occur at the polling rate.

During this mode, the algorithm still possesses the ability to mute and then power down the BTL amp

if the high overheat continues to be 1. This mode is disabled by default.

3.16.5. Short Circuit Protection

To avoid damage to the outputs if a short circuit condition should occur, both the headphone and BTL amplifiers imple-

ment short circuit protection circuits. The headphone output amplifier will detect the load current and limit its output if in

an over current state. The BTL amplifier will sense a short to PVDD, ground, or between its +/- outputs and disable its

output if a short is detected. After a brief time, the amplifier will turn on again. If a short circuit condition is still present,

the amplifier will disable itself again.

Increment

Ratio Count

OverheatHL ==?

IDLE

TS Disabled

Every “Poll” time

(8ms default)

Increment

Volume by

IncStep

Ratio met & Vol

/= Max?

Yes

Vol @ Min?

Yes

Vol = Mute?

Yes

Decrement

Volume by

DecStep

Volume =

Mute

BTL PWD

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