Datasheet

2 sm

AVDD/DVDD

PDN

PVDD

RESET

T0420-05

3V

8V

6V

I C

2ms

0ns

TAS5727

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SLOS670 –NOVEMBER 2010

Figure 37. Power-Loss Sequence

Initialization Sequence

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

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

2. Initialize digital inputs and PVDD supply as follows:

• Drive RESET = 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 RESET = 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.

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

4. Configure the DAP via I

C (see User's Guide for typical values).

5. Configure remaining registers.

6. Exit shutdown (sequence defined below).

Normal Operation

The following are the only events supported during normal operation:

1. Writes to master/channel volume registers

2. Writes to soft-mute register

3. Enter and exit shutdown (sequence defined below)

Note: Event 3 is not supported for 240 ms + 1.3 × t

start

after trim following AVDD/DVDD power-up ramp

(where t

start

is specified by register 0x1A).

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