TAS5548DCAR datasheet(103/116 Pages) TI1

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CH1

(Post DRC)

RMS

Weighting Register (Scale)

. . .

CH2

(Post DRC)

Satallite

Energy Sum

Programmable

Threshold

Comparator

EMO

CH7

(Post DRC)

0xBB–0xBE

Reg 0x10

0xB2

RMS

0xB3

0xB4

0xB9

CH8

(Post DRC)

0xB2

RMS

0xBA

Sub

Energy Sum

TAS5548

www.ti.com

SLES270A – NOVEMBER 2012 – REVISED APRIL 2015

9 Power Supply Recommendations

9.1 Power Supply

The TAS5548 requires a single 3.3-V nominal supply for pins DVDD1, DVDD2, AVDD, and AVDD_PWM. The

decoupling capacitors for the power supplies should be placed close to the device terminals.

9.2 Energy Manager

TAS5548 has an Energy Manager that can be used to monitor/control the overall energy in the system. The key

features are:

1. There are separate controllers for Satellite (EMO1) and Sub (EMO2) channels. If EMO2 is not enabled, then

the EMO1 pin is OR'd with the output of the subwoofer comparator.

2. The satellite channels participating in the energy estimation are selectable. For example, in the 5.1 Mode, the

line out channels can be programmed to not participate in the energy estimation.

3. There is a mixer for each channel before mixing. This is for scaling each channel before adding. The energy

of all participating satellite channels are added and compared with a programmable threshold. If the value

crosses the threshold, the satellite_over_power bit in the status register is set. Similarly, if the overall energy

is lower than another programmable register, the satellite_idle bit in the status register is set. Both these bits

are “sticky,” meaning once set, the external controller has to write a “0” to clear the bit

4. Similar to the satellite channel, the sub channel energy is also estimated and compared against an upper

and lower threshold. If above the upper threshold, the sub_over_power bit is set and if below the threshold,

the sub_idle_bit are set. These are also "sticky" bits. Sub channels also have a disable pin that bypass

energy comparison.

5. An OR of the 4 status bits are available on EMO pin

External controller on the detection of EMO interrupt (pin going high) can read the status register for more

information.

The controller can shutdown the PWM for idle mode and or reduce channel energy to reduce overall power. The

Controller discerns more details on the EMO condition by using the status and enable bits. Figure 52 shows the

EMO system for satellite channels. A similar EMO system for the subwoofer channel also will be implemented.

The EMO pin is shared between satellite and sub channels.

Figure 52. Energy Manager

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