MAS3587F datasheet(12/82 Pages) MICRONAS

12 / 82 page

MAS 3587F

ADVANCE INFORMATION

Micronas

If both DC/DC-converters are off, a high signal may be

applied at pin DCEN. This will start the converters in

their default mode (PWM with 3.0 V output voltage).

The PUP signal will change from low to high when both

converters have reached their nominal output voltage

and will return to low when both converters output volt-

ages have dropped 200 mV below their programmed

output voltage. The signal at pin PUP can be used to

control the reset of an external microcontroller (see

Section 2.13.2. on page 15 for details on start up pro-

cedure).

If only DC/DC-converter 1 is used, the output of the

unused converter 2 (VSENS2) must be connected to

the output of converter 1 (VSENS1) to make the PUP

signal work properly. Also, if a DC/DC-converter is not

used (no inductor connected), the pin DCSO must be

left vacant.

Fig. 2–7: DC/DC converter overview (DCEN input must be connected to pin I2CVDD via the 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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