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NuMicro® NUC029LEE/NUC029SEE
32-bit Arm
®
Cortex
®
-M0 Microcontroller
Aug, 2018
Page
31
of
497
Rev 1.00
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UC029
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CHN
ICA
L R
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6.2.3 System Power Distribution
In this chip, the power distribution is divided into three segments.
Analog power from AV
DD
and AV
SS
provides the power for analog components
operation.
Digital power from V
DD
and V
SS
supplies the power to the internal regulator which
provides a fixed 1.8 V power for digital operation and I/O pins.
USB transceiver power from V
BUS
offers the power for operating the USB transceiver.
Battery power from V
BAT
supplies the RTC and external 32.768 kHz crystal.
The outputs of internal voltage regulators, LDO and V
DD33
,
require an external capacitor which
should be located close to the corresponding pin. Analog power (AV
DD
) should be the same
voltage level with the digital power (V
DD
).
®
NUC029LEE/NUC029SEE power distribution.
LDO
USB 1.1
Tranceiver
5V to 3.3V LDO
PLL
12-bit
SAR-ADC
Brown-
out
Detector
POR50
POR18
Low
Voltage
Reset
External
32.768 kHz
Crystal
Analog Comparator
Temperature
Seneor
FLASH
Digital Logic
3.3V
1.8V
Internal
22.1184 MHz & 10 kHz
Oscillator
AV
DD
AV
SS
V
D
D
V
S
S
USB_VBUS
USB_VDD33_CAP
USB_D+
USB_D-
LDO_CAP
1uF
1uF
IO cell
GPIO
X
32
_O
U
T
X
32
_I
N
P
V
S
S
NUC029SEE
NUC029LEE
Power
Distribution
V
B
A
T
RTC
ULDO
1.8V
Figure 6.2-1 NuMicro
®
NUC029LEE/NUC029SEE Power Distribution Diagram