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SWRU543–January 2019
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Power, Reset, and Clock Management
Figure 15-1. Power Management Unit Configuration
15.1.2 VBAT Wide-Voltage Connection
In the wide-voltage battery connection, the device is powered directly by the battery or preregulated 3.3-V
supply. All other voltages required to operate the device are generated internally by the DC/DC
converters. This is the most common use for the device, as it supports wide-voltage operation from 2.1 V
to 3.6 V.
15.1.3 Supply Brownout and Blackout
BROWNOUT is the state where the supply voltage falls below the chip brownout threshold. For wide
voltage mode, V
brownout
= 2.1 V. The hibernate controller, 2 × 32-bit general-purpose retention register
inside the hibernate controller, the 32.768-kHz crystal oscillator, and the RTC counter are not impacted by
BROWNOUT state and continue to function. Once the supply voltage rises above V
brownout
, the chip
reboots.
BLACKOUT is the condition where the CC32xx PMU incorporates a continuous time coarse analog supply
voltage monitor that forces the PMU, including the hibernate controller, into a reset state where V
supply
<
V
blackout
. V
blackout
is typically 1.4 V and varies with temperature.
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