CC3235MODASF datasheet(71/100 Pages) TI1

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CC3235MODAS, CC3235MODASF

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SWRS233 – OCTOBER 2019

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Product Folder Links: CC3235MODAS CC3235MODASF

Detailed Description

(1)

Modes are listed in order of power consumption, with highest power modes listed first.

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

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).

The NWP can be active or in LPDS mode and takes care of its own mode transitions. When there is no

network activity, the NWP sleeps most of the time and wakes up only for beacon reception (see

Table 6-3).

Table 6-3. Networking Subsystem Modes

NETWORK PROCESSOR

MODE

DESCRIPTION

Network active mode

(processing layer 3, 2, and 1)

Transmitting or receiving IP protocol packets

Network active mode

(processing layer 2 and 1)

Transmitting or receiving MAC management frames; IP processing not required.

Network active listen mode

Special power optimized active mode for receiving beacon frames (no other frames supported)

Network connected Idle

A composite mode that implements 802.11 infrastructure power save operation. The CC3235MODAx

NWPs automatically go into LPDS mode between beacons and then wakes to active listen mode to

receive a beacon and determine if there is pending traffic at the AP. If not, the NWP returns to LPDS

mode and the cycle repeats.

Network LPDS mode

Low-power state between beacons in which the state is retained by the NWP, allowing for a rapid wake

up.

Network disabled

The network is disabled

The operation of the application and network processor ensures that the module remains in the lowest

power mode most of the time to preserve battery life.

The following examples show the use of the power modes in applications:

•

A product that is continuously connected to the network in the 802.11 infrastructure power-save mode

but sends and receives little data spends most of the time in connected idle, which is a composite of

receiving a beacon frame and waiting for the next beacon.

•

A product that is not continuously connected to the network but instead wakes up periodically (for

example, every 10 minutes) to send data, spends most of the time in hibernate mode, jumping briefly

to active mode to transmit data.

CC3235MODASF Datasheet(PDF) 71 Page - Texas Instruments

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