MAX32600 User’s Guide
Introduction
2.3 Power Supplies and Modes
2.3.3
Onboard Core Voltage Regulator
The
MAX32600
includes a dedicated onboard digital supply voltage regulator with a 1.8V nominal output voltage (V
REG18
). This internal regulator is used to provide
a fixed low-voltage digital supply for the internal CPU core. This regulator derives its voltage output from the main digital supply voltage (V
DD
) or V
DDB
when USB is
present.
2.3.4
Onboard VUSB Voltage Regulator and Automatic Power Switching
The
MAX32600
includes a second onboard digital supply voltage regulator which is used when a powered USB bus has been connected to the device. This regulator
takes the 5V (typical) supply from V
BUS
and regulates it down to a nominal 3.3V output. Automatic power switching features allow the device to switch automatically
from the external digital supply voltage to the V
BUS
-derived 3.3V supply voltage when USB power is available. This ensures that when the device is connected
to USB, it uses the power supply available from that source, instead of running from the normal digital supply which will typically be a battery supply for portable
applications.
2.3.5
VRTC Power Supply
A dedicated power supply is used to maintain the state and operation of the most critical components and memories, which can remain powered even when the
rest of the device is shut down in the lowest possible power savings modes. The V
RTC
supply ensures that the Real Time Clock can continue running (and can be
used to wake the
MAX32600
after a preset time interval) even when everything else has been powered down. The V
RTC
supply is also used to maintain certain
critical battery-backed areas, such as the power sequencer and associated control registers, the tamper-detect-wiped "key of keys", and certain analog trim shadow
registers.
2.3.6
Power Management Modes
Power management modes supported by the device include stop, standby, and active (PMU and run) modes. These four power modes are:
; and
. The Wakeup Interrupt Controller (WIC) can be used to wake the device from power saving modes.
Individual power down and clock gating controls are provided as well. This allows user application-specific reductions in power consumption by disabling/powering
down functions that are not currently in use.
2.3.7
Power Supply Monitoring
Several programmable supply voltage monitors are provided, which allow a power fail warning interrupt and/or a system reset to be triggered when the supply voltage
drops below a preset level (depending on the type of power supply and firmware settings). Supply voltage monitors are available to measure the following supplies:
V
DDA3
, V
RTC
, V
REG18
, and V
DD3
.
Rev.1.3 April 2015
Maxim Integrated
Page 11
Содержание MAX32600
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