LM3S6952 Datasheet, PDF (73/626 Pages) Texas Instruments – Stellaris LM3S6952 Microcontroller

Stellaris® LM3S6952 Microcontroller
software a mechanism to adjust the regulated value, in small increments (VSTEP), over the range
of 2.25 V to 2.75 V (inclusive)—or 2.5 V ± 10%. The adjustment is made by changing the value of
the VADJ field in the LDO Power Control (LDOPCTL) register.
Figure 6-4 on page 73 shows the power architecture.
Note: On the printed circuit board, use the LDO output as the source of VDD25 input. In addition,
the LDO requires decoupling capacitors. See “On-Chip Low Drop-Out (LDO) Regulator
Characteristics” on page 579.
Figure 6-4. Power Architecture
VDD
VCCPHY
VCCPHY
VCCPHY
VCCPHY
Ethernet
PHY
GNDPHY
GNDPHY
GNDPHY
GNDPHY
VDD25
VDD25
VDD25
VDD25
LDO
+3.3V
VDDA
VDDA
Internal
Logic and PLL
Low-noise
LDO
Analog circuits
(ADC, analog
comparators)
GND
GND
GND
GND
GNDA
GNDA
VDD
GND
VDD
GND
VDD
I/O Buffers
GND
VDD
GND
April 05, 2010
73
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