MAS3507D Просмотр технического описания (PDF) - Micronas

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MAS3507D

MPEG 1/2 Layer 2/3 Audio Decoder

Micronas 

MAS 3507D

PRELIMINARY DATA SHEET

2.6.4. Start-up Sequence

The DC/DC converter starts from a minimum input

voltage of 0.9 V. There should be no output load during

startup. In case WSEN is active, the MAS 3507D is in

the DSP operation mode. The start-up script should be

as follows:

1. Enable the DC/DC-converter with a high signal

(VDD, AVDD) at pin DCEN.

2. Wait until PUP goes “high”.

3. Wait one more millisecond to guarantee that the out-

put voltage has settled (recommended).

4. Enable the MAS 3507D with a “high” signal at pin

“WSEN”.

Please also refer to Figure 2–2.

µController

=1

WSEN > 2 V

> 0.9 V

DCEN

button

Fig. 2–2: DC/DC operation

DSP

operation

DC/DC

On

CLKI

VDD

Start-up

oscillator

Frequency

divider

DCCF

$8e

9 10

64...94

x2

32...47

+32

0...15

AVDD

DCSO

DC/DC

converter

DCSG

voltage monitor

DCEN

PUP

16

VSS

WSEN

VSENSE

AVSS

optional

filter

22 µH

+

−

Power-On

Push Button

10 kΩ

Cout

330 µF

Low ESR

Cin

330 µF

10 nF

47 kΩ 47 kΩ

+

−

Vin

≥0.9 V

Fig. 2–3: DC/DC converter connections

µController

10

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