TAS5548 datasheet(45/120 Pages) TI

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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

SLES270 – NOVEMBER 2012

System Power Controller

6.1

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

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 6-1 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 6-1. Energy Manager

System Power Controller

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