MAS3587F datasheet(13/82 Pages) MICRONAS

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ADVANCE INFORMATION

MAS 3587F

Micronas

2.9.3. Power Supply Configurations

One of the following supply configurations may be

used:

– Configuration 1: DC/DC 1 (e.g. 2.7 V) supplies con-

troller, flash and MAS 3587F audio parts, DC/DC 2

generates e.g. 2.5 V/3.5 V for the MAS 3587F DSP

(see Fig. 2–8).

– Configuration 2: All components are powered by an

external source, no DC/DC converter is used (see

Fig. 2–9).

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

circuits (pins AVDD0, AVDD1) of the MAS 3587F.

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

be connected to VSS, DCSOx must be left vacant.

2.10. Battery Voltage Supervision

A battery voltage supervision circuit (at pin VBAT) is

provided which is independent of the DC/DC convert-

ers. It can be programmed to supervise one or two bat-

tery cells. The voltage is measured by subsequently

setting a series of voltage thresholds and checking the

respective comparison result in register 77hex (see

Table 3–3 on page 20).

Fig. 2–8: Configuration1: DC/DC-Converter supply

Fig. 2–9: Configuration2: External power supply

Flash

µC

DSP

VSENS1

AVDD0/1

VSENS2

XVDD

VDD

I2CVDD

DC/DC1

I2C

DC/DC2

Analog

Parts

e.g. 3.5 V

e.g. 2.7 V

/2.5 V

Flash

µC

DSP

VSENS1

AVDD0/1

VSENS2

VDD

XVDD

I2CVDD

DC/DC1

I2C

DC/DC2

Analog

Parts

External

Supply

e.g. 3.5 V/

off

2.7 V

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