mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 1019

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

41.1.3 Modes of Operation
The regulator has these power modes:
The regulator is enabled by default. This means that once the power supply is provided,
the module power-up sequence to RUN mode starts.
41.2 USB Voltage Regulator Module Signal Descriptions
The following table shows the external signals for the regulator.
Freescale Semiconductor, Inc.
• Pass-through mode for regulator input voltages less than 3.6 V
• Small output capacitor: 2.2 uF
• Stable with aluminum, tantalum or ceramic capacitors.
• RUN—The regulating loop of the RUN regulator and the STANDBY regulator are
• STANDBY—The regulating loop of the RUN regulator is disabled and the standby
• SHUTDOWN—The module is disabled.
active, but the switch connecting the STANDBY regulator output to the external pin
is open.
regulator is active. The switch connecting the STANDBY regulator output to the
external pin is closed.
reg33_out
reg33_in
Signal
Table 41-1. USB Voltage Regulator Module Signal Descriptions
Unregulated power supply
Regulator output voltage
Description
MCF51JF128 Reference Manual, Rev. 2, 03/2011
Preliminary
Chapter 41 USB Voltage Regulator (VREG)
I/O
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