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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
23-5
23.5
Initialization/Application Information
23.5.1
Voltage Regulator Example
Figure 23-3. Voltage Regulator Controller Hookup
NOTE
The figure above should not be used as an application board design
reference. The resistor may or may not be needed. See Application Note
AN3254.
23.5.2
Recommended Power Transistors
Freescale recommends the use of the following NPN transistors with the on-chip Voltage Regulator
Controller: ON Semiconductor™ NJD2873 and Phillips Semiconductor™
BCP68.
Refer to the
MPC5553/MPC5554 Microcontroller Data Sheet
for information on recommended operating
characteristics.
23.5.3
Power Sequencing
Power sequencing between the 1.5 V power supply and V
DDSYN
or the RESET power supplies is required
if the user provides an external 1.5 V power supply and ties V
RC33
to ground. To avoid this power
sequencing requirement, the user should power up V
RC33
within the specified operating range, even if not
using the on chip voltage regulator controller. Refer to
Section 23.5.3.1, “Power-Up Sequence If VRC33
Section 23.5.3.2, “Power-Down Sequence If VRC33 Grounded
.”
Another power sequencing requirement is that V
DD33
must be of sufficient voltage before POR negates so
that the values on certain pins are treated as 1s when POR does negate. Refer to
Value of Pins During POR Dependent on VDD33
.”
Although there is no power sequencing required between V
RC33
and V
DDSYN
, during power up, in order
for the VRC staged turn-on to operate within specification, V
RC33
must not lead V
DDSYN
by more than
600 mV or lag by more than 100 mV. Higher spikes in the emitter current of the pass transistor will occur
MCU
V
RC33
V
RCCTL
V
DD
V
RCVSS
The resistor may or may not
Note 3254 for the
size of the resistor.
Refer to Application
be needed.
Содержание MPC5553
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