Datasheet

Power supply
Board contains switching power
supply that creates stable voltage
and current levels necessary
for powering each part of
the board. Power supply
section contains specialized
MC33269DT3.3 power regulator
which creates VCC-3.3V power supply,
thus making the board capable of supporting
3.3V microcontrollers. Power supply unit can be
powered in three dierent ways: with USB power supply
(CN20), using external adapters via adapter connector (CN30)
or additional screw terminals (CN31). External adapter voltage levels
must be in range of 9-32V DC and 7-23V AC. Use jumper J9 to specify
which power source you are using. Upon providing the power using either external
adapters or USB power source you can turn on power supply by using SWITCH 1 (Figure
3-1). Power LED ON (Green) will indicate the presence of power supply.
Figure 3-1: Power supply unit of EasyMx PRO
™
v7 STM32
8
7
6
5
C38
100nF
VCC-5V
2
1
3
GND
Vout
Vin
REG1
MC33269DT3.3
E16
10uF
3.3V VOLTAGE REGULATOR
VCC-3.3V
E17
220uF/35V
C37
100nF
J9
D3
1N4007
D4
1N4007
D5
1N4007
D6
1N4007
CN30
CN31
VCC-5V
POWER
R68
2K2
LD78
E18
220uF/35V
E19
220uF/35V
1
2
3
4
SWC
SWE
CT
GND
DRVC
IPK
VIN
CMPR
U8
MC34063A
R69
0.22
R74
3K
VCC-SW
C39
220pF
D7
MBRS140T3
L1 220uH
VCC-EXT
R76
1K
VCC-5V
2 1 3
SWITCH1
VCC-USB
VCC-SW
+ -
5V SWITCHING POWER SUPPLY
1
2
3
4
VCC
GND
CN20
USB B
VCC-USB
FP1
C5
100nF
power supply
page 6
EasyMx PRO
v7
Figure 3-2:
Power supply
unit schematic