Power-Management Subsystem; Low-Power Operating Mode - Texas Instruments SimpleLink CC3200MOD Manual

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5.6

Power-Management Subsystem

The CC3200 power-management subsystem contains DC-DC converters to accommodate the differing
voltage or current requirements of the system. The module can operate from an input voltage ranging from
2.3 V to 3.6 V and can be directly connected to 2xAA Alkaline batteries.
The CC3200MOD 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.
5.6.1 VBAT Wide-Voltage Connection
In the wide-voltage battery connection, the module 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 scheme is the most common mode for the device as it supports wide-voltage operation
from 2.3 to 3.6 V.
5.7

Low-Power Operating Mode

From a power-management perspective, the CC3200 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. 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 5-2
APPLICATION PROCESSOR
(MCU) MODE
MCU active mode
MCU sleep mode
MCU LPDS mode
MCU hibernate mode
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Table 5-2.
lists the modes by power consumption, with highest power modes listed first.
Table 5-2. User Program Modes
MCU executing code at 80-MHz state rate
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.
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 defined in
Table 3-2 as the wake-up source.
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 real-time clock (RTC) clock 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 (GPIO0–GPIO6).
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NOTE
DESCRIPTION
CC3200MOD
SWRS166 – DECEMBER 2014
Detailed Description 45