MAS3529F datasheet(13/92 Pages) MICRONAS

13 / 92 page

DATA SHEET

MAS 35x9F

Micronas

June 30, 2004; 6251-505-1DS

2.6.3. Power Supply Configurations

One of the following supply configurations may be

used:

– Power-optimized solution (recommended opera-

tion). DC/DC 1 (e.g. 2.2 V) drives the MAS 35x9F

DSP and the audio circuitry, DC/DC 2 (e.g. 2.7 V)

supplies controller and flash (see Fig. 2–8 on

page 14)

– Volume-optimized solution. DC/DC 1 (e.g. 2.7 V)

supplies controller, flash and MAS 35x9F audio

parts, DC/DC 2 generates e.g. 2.2 V for the

MAS 35x9F DSP (see Fig. 2–9 on page 14).

– Minimized external components. DC/DC 1 operates

on, e.g., 2.7 V and feeds all components, DC/DC 2

remains off (see Fig. 2–10 on page 14).

– External power supply. All components are powered

by an external source, no DC/DC converter is used

(see Fig. 2–11 on page 14).

If DC/DC converter 1 is used, it must supply the analog

circuits (pins AVDD0, AVDD1) of the MAS 35x9F.

If only one DC/DC converter is required, DC/DC1 must

be used. Pin DCSO2 must be left vacant, pin VSENS2

should be connected to pin VSENS1.

If the DC/DC converters are not used, pin DCEN must

be connected to VSS, DCSOx must be left vacant.

Fig. 2–7: DC/DC converter overview. The DCEN input must be connected to pin I2CVDD via start-up push button.

−

VSS

DCSO2

DCSG2

DCEN

PUP

VSENS2

Vin

µH

330

µF

DCFR (77hex)

DCCF (76hex)

Start

PUP2

set voltage

factor

output 1

I2CVDD

to I2C interface

supply

VBAT

battery

voltage

monitor

DC/DC

converter 2

voltage

monitor

voltage

monitor

DC/DC

converter 1

frequency

divider

system

or crystal

clock

−

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