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MAS3587F データシート(PDF) 12 Page - Micronas

部品番号 MAS3587F
部品情報  Audio Encoder/Decoder
PDF  82 Pages
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メーカー  MICRONAS [Micronas]
ホームページ  http://www.micronas.com
Logo MICRONAS - Micronas

MAS3587F データシート(HTML) 12 Page - Micronas

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MAS 3587F
ADVANCE INFORMATION
12
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)
15
8
−
+
−
+
VSS
DCSO2
DCSG2
DCEN
PUP
VSENS2
Vin
22
µH
C1
330
µF
S
R
30
DCFR (77hex)
DCCF (76hex)
70
DCCF (76hex)
D1
Start
PUP2
set voltage
factor
output 1
I2CVDD
to I2C interface
supply
L1
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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