TAS2563 datasheet(67/127 Pages) TI

67 / 127 page

Table 8-88. Clock Halt Timer (continued)

CLK_HALT_TIMER[2:0]

Setting

101

209.71 ms

110

419.43 ms

111

838.86 ms

8.4.8 Thermal Foldback

The TAS2563 monitors the die temperature and can automatically limit the audio signal when the die

temperature reaches a set threshold. It is recommended to use Section 8.3.1 to configure the thermal foldback

as the software will perform the necessary math for each register.

Thermal foldback can be disabled using TF_EN. If the die temperature reaches TF_TEMP_TH this feature will

begin to attenuate the audio signal to prevent the device from shutting down due to over-temperature. It will

attenuate the audio signal by TF_LIMS db per degree of temperature over TF_TEMP_TH. The thermal foldback

with attack at a fixed rate of 0.25 dB per sample. A maximum attenuation of TF_MAX_ATTN can be specified.

However if the device continue to heat up eventually the device over-temperature will be triggered. The

attenuation will be held for TF_HOLD_CNT samples before the attenuation will begin releasing.

Table 8-89. Thermal Foldback Enable

TF_EN

SETTING

Disabled

Enabled (default)

Table 8-90. Thermal Foldback Registers

DESCRIPTION

CALCULATION

TF_LIMS

Thermal foldback

limiter slope (in

db/°C)

round(10^(-slope /

20)*2^31)

TF_HOLD_CNT

Thermal foldback hold

count (samples)

round(seconds *

1000)

TF_REL_RATE

Thermal foldback

limiter release rate

(db/samples)

round(10^(dB per

sample / 20)*2^30)

TF_TEMP_TH

Thermal foldback

limiter temperature

threshold (°C)

round(°C * 2^23)

TF_MAX_ATTN

Thermal foldback max

gain reduction (dB)

round(10^(max attn

dB/20)*2^31)

www.ti.com

TAS2563

SLASET3B – FEBRUARY 2020 – REVISED DECEMBER 2020

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