TAS5721 datasheet(60/71 Pages) TI1

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AVDD/DVDD

PDN

PVDD

RST

T0420-06

3 V

8 V

6 V

I C

2 ms

0 ns

TAS5721

SLOS739 – JULY 2012

www.ti.com

Figure 72. Power Loss Sequence

Recommended Command Sequences

Initialization Sequence

Use the following sequence to power-up and initialize the device:

Hold all digital inputs low and ramp up AVDD/DVDD to at least 3 V.

Initialize digital inputs and PVDD supply as follows:

•

Drive RST = 0, PDN = 1, and other digital inputs to their desired state while ensuring that all

are never more than 2.5 V above AVDD/DVDD. Wait at least 100 µs, drive RST = 1, and wait

at least another 13.5 ms.

•

Ramp up PVDD to at least 8 V while ensuring that it remains below 6 V for at least 100 µs

after AVDD/DVDD reaches 3 V. Then wait at least another 10 µs.

Trim oscillator (write 0x00 to register 0x1B) and wait at least 50 ms.

Configure the DAP via I2C (see Users's Guide for typical values).

Configure remaining registers.

Exit shutdown (sequence defined below).

Normal Operation

The following are the only events supported during normal operation:

Writes to master/channel volume registers.

Writes to soft mute register.

Enter and exit shutdown (sequence defined below).

Note: Event 3 is not supported for 240 ms + 1.3 × tstart after trim following AVDD/DVDD powerup ramp

(where tstart is 300 ms when mid-Z ramp is enabled and is otherwise specified by register 0x1A).

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