TAS2120 datasheet(28/63 Pages) TI

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SAR

ADC

PVDD

Limiter

Brown

Out

Preven on

AUDIO_IN

AUDIO_OUT

SETTINGS

VBAT

VBAT_SNS

Figure 6-2. Limiter and Brown out protection module

The Brown Out Prevention (BOP) module provides a priority input to provide a fast response to transient

dips in the battery supply. The BOP feature can be enabled by configuring the register bit BOP_EN high.

The supply voltage that is tracked to determine Brown out conditions can be configured as VBAT /VBAT_SNS or

PVDD based on system configuration needs by using BOP_SRC register bit. When the selected supply dips

below the brown-out threshold configured by setting register BOP_THR_LVL[23:0], the BOP will begin reducing

gain. The rate of gain reduction (db/sample) can be configured by setting the BOP_ATK_RATE[23:0] registers .

When the VBAT supply rises above the brownout threshold, the BOP will begin to release the gain after the

programmed hold timer, BOP_HLD_COUNT[23:0]. The BOP feature uses the LIM_RLS_RATE[23:0] register

setting to release after a brown out event. The release rate is rate of gain increase in db/sample ratio. During a

BOP event the limiter updates will be paused. This is to prevent a limiter from releasing during a BOP event.

VBAT

BOP Thresh

BOP Active

BOP

Attacking

BOP

Holding

Limiter Releasing

(BOP Inactive)

BOP Inactive

BOP Mode

Figure 6-3. Brown Out Prevention Event

The device can be configured to hold the gain attenuation once a BOP event is detected by setting the

release the gain attenuation and holds the device in the programmed min gain attenuation level until the infinite

hold is cleared by setting the register bit BOP_HLD_CLR high. The hold clearing bit is self clearing and will

automatically reset to low state once the hold is cleared.

A hard brownout level can be set to shutdown the device if the BOP gain attenuation cannot mitigate the drop

in battery voltage. The brown out based shutdown of the device is enabled when BOPSD_EN bit is set high

and shuts down when the battery voltage falls below the voltage threshold set by BOSD_THR_LVL[23:0] register

bits.

A maximum level of attenuation applied by the limiters and brown out prevention feature is configurable via the

LIM_MAX_ATN register. This attenuation limit is shared between the features. For instance, if the maximum

attenuation is set to 6 dB and the limiters have reduced gain by 4 dB, the brown out prevention feature will only

be able to reduce the gain further by another 2 dB. If the limiter or brown out prevention feature is attacking and

it reaches the maximum attenuation, gain will not be reduced any further.

TAS2120

SLASFC6 – AUGUST 2024

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