TAS2781RYYR datasheet(19/90 Pages) TI2

19 / 90 page

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 MODE Selection

TAS2781 has two modes of operation selected based on the setting of the pin 26 (MODE) - see table below.

Table 8-2. TAS2781 Control Interface

Amplifier Mode

Control Interface

Pin 26 (MODE)

Smart Amp

I2C

Connected to GND

Smart Amp

SPI

470 Ω to GND

8.3.2 Device Address Selection

The TAS2781 operates using a TDM/I2S interface. Audio input and output are provided via the FSYNC, SBCLK,

SDIN and SDOUT pins using formats including I2S, Left Justified and TDM. Configuration and status are

provided using the I2C protocol (MODE pin tied to GND) or SPI protocol MODE pin connected to GND through a

470 Ohms).

The table below illustrates how to configure the device for I2C address. The peripheral addresses are shown left

shifted by one bit with the R/W bit set to 0 (for example, {ADDR[6:0],1b0}). Resistors with tolerance better than

5% must be used for setting the address configuration.

Table 8-3. I2C Address Selection

I2C Address

0x70

0x72

0x74

0x76

0x78

0x7A

0x7C

0x7E

ADDR PIN

Short to

GND

470 Ω to

GND

470 Ω to

AVDD

2.2 kΩ to

GND

2.2 kΩ to

AVDD

10 kΩ to

GND

10 kΩ to

AVDD

Short to AVDD

The TAS2781 has a global 7-bit I2C address 0x80. When bit I2C_GLB_EN of register from is set high the device

will respond to I2C commands at this address regardless of the ADDR pin settings. This is used to speed up

device configuration when using multiple TAS2781 devices and programming similar settings across all devices.

The I2C ACK / NACK cannot be used during the multi-device writes since multiple devices are responding to

the I2C command. The I2C CRC function should be used to ensure each device properly received the I2C

commands. At the completion of writing multiple devices using the global address, the CRC at I2C_CKSUM

can be disabled using I2C_GBL_EN register bit. The I2C address is detected by automatically sampling the

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TAS2781

SLOSE86B – JULY 2022 – REVISED JULY 2023

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