TAS5802PWPR datasheet(28/106 Pages) TI2

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6.4 Device Functional Modes

6.4.1 Software Control

The TAS5802 device is configured via an I2 C communication port.

The I2C Communication Protocol is detailed in the I2C Communication Port section. The I2C timing requirements

are described in the I2C Bus Timing – Standard and I2C Bus Timing – Fast sections.

6.4.2 Speaker Amplifier Operating Modes

The TAS5802 device can only be configured in BTL Mode.

6.4.2.1 BTL Mode

In BTL mode, the TAS5802 amplifies two independent signals, which represent the left and right portions of a

stereo signal. The amplified left signal is presented on differential output pair shown as OUT_A+ and OUT_A-,

the amplified right signal is presented on differential output pair shown as OUT_B+ and OUT_B-.

6.4.3 Low EMI Modes

TAS5802 employs several modes to minimize EMI during playing audio, and they can be used based on

different applications.

6.4.3.1 Spread Spectrum

Spread spectrum is used in some inductor free case to minimize EMI noise. The TAS5802 supports Spread

Spectrum with triangle mode.

User needs to configure register RAMP_SS_CTRL0 (0x6B) to enable Spread Spectrum with triangle mode, and

select spread spectrum frequency and range with RAMP_SS_CTRL1 (0x6C). For 384kHz FSW which configured

by DEVICE_CTRL1 (0x02), the Spread Spectrum frequency and range are described in Table 6-4

Table 6-4. Triangle Mode Spread Spectrum Frequency and Range Selection

TRI_CTRL[3

:0]

Triangle

Freq

24k

48k

Spread

Spectrum

Range

10%

20%

25%

10%

20%

25%

User Application example-Central Switching Frequency is 384kHz, Triangle Frequency is 24kHz:

w A8 6B 01 //RAMP_SS_CTRL0[0]=1, Enable Triangle Spread Spectrum

w A8 6C 03 //RAMP_SS_CTRL1[3:0]=0011, Triangle Frequency = 24kHz, Spread Spectrum Range should be

25% (336kHz~432kHz)

6.4.3.2 Channel to Channel Phase Shift

This device supports channel to channel 180-degree PWM phase shift to minimize the EMI.

6.4.3.3 Multi-Devices PWM Phase Synchronization

This device supports up to 4 phase selections for multiple device application systems. For example, when a

system integrated 4 pieces of TAS5802 devices, user can select phase 0/1/2/3 for each device with register

RAMP_PHASE_CTRL (0x6A), which means there is a 45-degree phase shift between each device to minimize

the EMI.

Recommend to do the Phase Synchronization with I2S clock during the Startup Phase:

1. Halt I2S clock.

2. Configure each device phase selection and enable the phase synchronization. For example: Register 0x6A

= 0x00 for device 0; Register 0x6A = 0x03 for device 1; Register 0x6A = 0x08 for device 2; Register 0x6A =

0x0C for device 3. There should be a 45-degree PWM phase shift between each device to minimize the EMI.

TAS5802

SLASFB7A – NOVEMBER 2024 – REVISED AUGUST 2025

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