TAS5828M datasheet(21/83 Pages) TI

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8.4.3.2 Channel to Channel Phase Shift

This device supports channel to channel 180-degree PWM phase shift to minimize the EMI. Bit 0 of Register

0x53 can be used to disable or enable the phase shift.

8.4.3.3 Multi-Devices PWM Phase Synchronization

TAS5828M support up to 4 phases selection for the multi devices application system. For example, when

a system integrated 4 TAS5828M devices, user can select phase0/1/2/3 for each device by register

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

EMI.

There are two methods for Multi-Device PWM phase synchronization. Phase Synchronization With I2S Clock In

Startup Phase or Phase Synchronization With GPIO.

8.4.3.3.1 Phase Synchronization With I2S Clock In Startup Phase

1. Step 1, Halt I2S clock.

2. Step 2, Configure each device phase selection and enable the phase synchronization. For example:

3. Step 3, Configure each device into HIZ mode.

4. Step 4, Provide I2S to each device. Phase synchronization for all 4 devices is automatically done by internal

sequence.

5. Step 5, Initialize the DSP code (This step can be skipped if only need to do the Phase Synchronization).

6. Step 6, Device to Device PWM phase shift should be fixed with 45 degree.

8.4.3.3.2 Phase Synchronization With GPIO

1. Step 1, Connect GPIOx pin of each device to the SOC GPIO pin on PCB.

2. Step 2, Configure each device GPIOx as phase sync input usage by registers GPIO_CTRL (0X60) and

GPIO_INPUT_SEL (0x64).

3. Step 3, Select different phase for each device and enable phase synchronization by register PHASE_CTRL

(0x6A).

4. Step 4, Configure each device into PLAY mode by register DEVICE_CTRL2 (0x03) and monitor the

POWER_STATE register (0x68) until device changed to HIZ state.

5. Step 5, Give a 0 to 1 toggle on SOC GPIO. Then all 4 devices nter into PLAY mode, and device-to-device

PWM phase shift should be fixed with 45 degree.

6. Step 6, Phase Synchronization has been finished. Configure the GPIOx pin to other function based on the

application.

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TAS5828M

SLASEX7 – JUNE 2021

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TAS5828M Datasheet(PDF) 21 Page - Texas Instruments