PXR40RM Datasheet, PDF (136/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

Power Management Controller (PMC)
Table 5-1. PMC Operation Modes (continued)
Short Mode
Full Name
Description
LDO5V
SMPS5V
5V Voltage Supply, LDO
regulator enabled
When external pin REGSELis connected to VSS -it has a weak internal resistive
pull down- and regulator supply voltage is 5V nominal, the Linear 1.2V VRC is
enabled, as the internal 3.3V regulator. An external ballast transistor is expected
on REGCTL as described in 1.2V LDO regulator section. An external decoupling
capacitor is expected on VDDSYN (details in the 3.3V regulator section). VDDREG
LVD selected to 3V nominal.
5V Voltage Supply,
When external pin REGSEL is connected to VDDREG and regulator supply voltage
SMPS regulator enabled is 5V nominal, the Switched Mode VRC is enabled, and the internal 3.3V regulator
is enabled. An external MOS - Schottky device is expected on REGCTL as
described in SMPS regulator section. A decoupling capacitor must be used on
VDDSYN (details in the 3.3V regulator section). VDDREG LVD selected to 5V
nominal.
5.2 External Signals Description
5.2.1 Signals Information
The following table describes the PMC signals and their properties (also refer to the Signals chapter).
Table 5-2. PMC Signals
Pin Name
VDDREG
VSS
VDD
VDDSYN
REGSEL
REGCTL
VSS
VDD33
Type
supply
supply
supply
supply
input
output
supply
input
Nominal Voltage (V)
3.3 or 5
ground
1.2
3.3
ground or VDDREG
0V – 5V PWM signal in SMPS mode
About VDD+0.7V in LDO mode.
ground
3.3
5.3 Signals Details
The following sections detail the signals used by the PMC .
5.3.1 VDDREG
Positive analog power supply for PMC and voltage regulators. It can be nominal 5V or nominal 3.3V. It
supplies internal regulators and LVDs.
Voltage range VDDR for 5V operation and VDD33 for 3V operation can be found in the PXR40
Microcontroller Data Sheet.
PXR40 Microcontroller Reference Manual, Rev. 1
5-4
Freescale Semiconductor