MC68HC05PV8 Datasheet, PDF (155/196 Pages) Freescale Semiconductor, Inc – Techinal Data - rev 1.9

Freescale Semiconductor, Inc.
Technical Data — MC68HC(8)05PV8/A
Section 12. Voltage Regulator
12.1 Contents
12.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
12.3 Internal Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
12.4 5V Regulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
12.5 Trimming the Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . 156
12.2 Introduction
The MC68HC(8)05PV8/A contains a low-power, low-drop CMOS
on-chip fixed voltage regulator to provide internal power to the MCU from
an external DC source. The MC68HC05PV8A contains on top of that a
selectable standby regulator to achieve lower standby current.
12.3 Internal Power Supply
The on-chip voltage regulation and power supply control circuitry is
comprised of two elements: the regulator and the low voltage reset
(LVR) circuitry on the MC68HC(8)05PV8. In addition to that, the voltage
regulator on MC68HC05PV8A comprises a standby regulator and a
standby low voltage reset block.
12.4 5V Regulator
The 5V regulator accepts an unregulated input supply and provides a
regulated 5V supply to all the digital sections of the device. The output
of this regulator is also connected to the VDD pin to allow for decoupling
and to provide an external power source.
The voltage regulator handles the generation of low voltage resets.
For details refer to 5.12 Low Voltage Reset.
MC68HC(8)05PV8/A — Rev. 1.9
Voltage Regulator
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Technical Data