Datasheet

MC9S12XE-Family Reference Manual Rev. 1.25
Freescale Semiconductor 815
Chapter 23
Voltage Regulator (S12VREGL3V3V1)
23.1 Introduction
Module VREG_3V3 is a tri output voltage regulator that provides two separate 1.84V (typical) supplies
differing in the amount of current that can be sourced and a 2.82V (typical) supply. The regulator input
voltage range is from 3.3V up to 5V (typical).
23.1.1 Features
Module VREG_3V3 includes these distinctive features:
• Three parallel, linear voltage regulators with bandgap reference
• Low-voltage detect (LVD) with low-voltage interrupt (LVI)
• Power-on reset (POR)
• Low-voltage reset (LVR)
• High Temperature Detect (HTD) with High Temperature Interrupt (HTI)
• Autonomous periodical interrupt (API)
23.1.2 Modes of Operation
There are three modes VREG_3V3 can operate in:
1. Full performance mode (FPM) (MCU is not in stop mode)
The regulator is active, providing the nominal supply voltages with full current sourcing capability.
Features LVD (low-voltage detect), LVR (low-voltage reset), and POR (power-on reset) and HTD
(High Temperature Detect) are available. The API is available.
2. Reduced power mode (RPM) (MCU is in stop mode)
The purpose is to reduce power consumption of the device. The output voltage may degrade to a
lower value than in full performance mode, additionally the current sourcing capability is
substantially reduced. Only the POR is available in this mode, LVD, LVR and HTD are disabled.
The API is available.
Table 23-1. Revision History
Revision
Number
Revision Date
Sections
Affected
Description of Changes
V01.02 09 Sep 2005 23.3.2.3/23-822 - Updates for API external access and LVR flags.
V01.03 23 Sep 2005 23.3.2.1/23-820 - VAE reset value is 1.
V01.04 08 Jun 2007 23.4.6/23-827 - Added temperature sensor to customer information