CC3220MOD Datasheet, PDF (56/82 Pages) Texas Instruments – SimpleLink Wi-Fi CERTIFIED Wireless Module Solution

CC3220MOD
SWRS206 – MARCH 2017
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6.5 Power-Management Subsystem
The CC3220MODx power-management subsystem contains DC-DC converters to accommodate the
differing voltage or current requirements of the system.
The CC3220MODx is a fully integrated module-based WLAN radio solution used on an embedded system
with a wide-voltage supply range. The internal power management, including DC-DC converters and
LDOs, generates all of the voltages required for the module to operate from a wide variety of input
sources. For maximum flexibility, the module can operate in the modes described in the following sections.
6.5.1 VBAT Wide-Voltage Connection
In the wide-voltage battery connection, the module can be directly connected to two AA alkaline batteries.
All other voltages required to operate the device are generated internally by the DC-DC converters. This
scheme is the most common mode for the device because it supports wide-voltage operation from 2.3 to
3.6 V.
6.6 Low-Power Operating Mode
From a power-management perspective, the CC3220MODx device comprises the following two
independent subsystems:
• Cortex-M4 application processor subsystem
• Networking subsystem
Each subsystem operates in one of several power states.
The Cortex-M4 application processor runs the user application loaded from an external serial Flash, or
internal Flash (in CC3220MODSF). The networking subsystem runs preprogrammed TCP/IP and Wi-Fi
data link layer functions.
The user program controls the power state of the application processor subsystem and can be in one of
the five modes described in Table 6-2.
Table 6-2. User Program Modes
APPLICATION PROCESSOR
(MCU) MODE⁽¹⁾
DESCRIPTION
MCU active mode
MCU executing code at 80-MHz state rate
MCU sleep mode
The MCU clocks are gated off in sleep mode and the entire state of the device is retained. Sleep mode
offers instant wakeup. The MCU can be configured to wake up by an internal fast timer or by activity
from any GPIO line or peripheral.
MCU LPDS mode
State information is lost and only certain MCU-specific register configurations are retained. The MCU
can wake up from external events or by using an internal timer. (The wake-up time is less than 3 ms.)
Certain parts of memory can be retained while the MCU is in LPDS mode. The amount of memory
retained is configurable. Users can choose to preserve code and the MCU-specific setting. The MCU
can be configured to wake up using the RTC timer or by an external event on specific GPIOs as the
wake-up source.
MCU hibernate mode
The lowest power mode in which all digital logic is power-gated. Only a small section of the logic directly
powered by the input supply is retained. The RTC keeps running and the MCU supports wakeup from
an external event or from an RTC timer expiry. Wake-up time is longer than LPDS mode at about 15 ms
plus the time to load the application from serial Flash, which varies according to code size. In this mode,
the MCU can be configured to wake up using the RTC timer or external event on a GPIO .
MCU shutdown mode
The lowest power mode system-wise. All device logics are off, including the RTC. The wake-up time in
this mode is longer than hibernate at about 1.1 s. To enter or exit the shutdown mode, the state of the
nRESET line is changed (low to shut down, high to turn on).
(1) Modes are listed in order of power consumption, with highest power modes listed first.
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