MAS3587F Micronas, MAS3587F Datasheet - Page 12

• Manufacturer Part Number: MAS3587F
• Description: MPEG Layer 3 Audio Encoder/Decoder
• Manufacturer: Micronas

MAS 3587F
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)
12
system
or crystal
clock
15
7
DCCF (76
DCCF (76
PUP2
DCFR (77
3
frequency
divider
to I
set voltage
factor
2
hex
hex
C interface
hex
0
)
)
)
0
8
converter 2
converter 1
DC/DC
monitor
monitor
monitor
voltage
voltage
voltage
battery
DC/DC
S
R
VSENS2
I2CVDD
DCSO2
DCSG2
DCEN
VBAT
PUP
VSS
supply
Start
output 1
330 F
D1
C1
22 H
L1
ADVANCE INFORMATION
Micronas
V
in