ADE7569 datasheet(33/136 Pages) AD

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Preliminary Technical Data

ADE7566/ADE7569

Rev. PrA | Page 33 of 136

TRANSITIONING BETWEEN OPERATING MODES

The operating mode of the ADE7566/ADE7569 is determined

by the power supply connected to VSW. Therefore, changes in

the power supply such as when VSW switches from VDD to VBAT,

or when VSW switches to VDD, alters the operating mode. This

section describes events that change the operating mode.

Automatic Battery Switchover (PSM0 to PSM1)

If any of the enabled battery switchover events occur (see the

Battery Switchover section), VSW switches to VBAT. This switchover

results in a transition from the PSM0 to PSM1 operating mode.

When battery switchover occurs, the analog circuitry used in

the ADE energy measurement DSP is disabled. To reduce power

consumption, the user code can initiate a transition to PSM2.

Entering Sleep Mode (PSM1 to PSM2)

To reduce power consumption when VSW is connected to VBAT,

user code can initiate sleep mode, PSM2, by setting Bit 4 in the

Power Control SFR (POWCON, 0xC5) to shut down the MCU

core. Events capable of waking the MCU can be enabled (see the

3.3 V Peripherals and Wake-Up Events section).

Servicing Wake-Up Events (PSM2 to PSM1)

The ADE7566/ADE7569 may need to wake up from PSM2 to

service wake-up events (see the 3.3 V Peripherals and Wake-Up

Events section). PSM1 code execution begins at the power-on

reset vector. After servicing the wake-up event, the ADE7566/

ADE7569 can return to PSM2 by setting Bit 4 in the Power

Control SFR (POWCON, 0xC5) to shut down the MCU core.

Automatic Switch to VDD (PSM2 to PSM0)

If the conditions to switch VSW from VBAT to VDD occur (see the

Battery Switchover section), the operating mode switches to

PSM0. When this switch occurs, the MCU core and the analog

circuitry used in the ADE energy measurement DSP

automatically restarts. PSM0 code execution begins at the

power-on reset vector.

Automatic Switch to VDD (PSM1 to PSM0)

If the conditions to switch VSW from VBAT to VDD occur (see the

Battery Switchover section), the operating mode switches to

PSM0. When this switch occurs, the analog circuitry used in the

ADE energy measurement DSP automatically restarts. Note that

code execution continues normally. A software reset can be

performed to start PSM0 code execution at the power-on reset

vector.

USING THE POWER MANAGEMENT FEATURES

Because program flow is different for each operating mode, the

status of VSW must be known at all times. The FVSW bit in the

Power Management Interrupt Flag SFR (IPSMF, 0xF8) indicates

what VSW is connected to. This bit can be used to control program

flow on wake-up. Because code execution always starts at the

power-on reset vector, Bit 6 of the Peripheral Configuration

SFR (PERIPH, 0xF4) can be tested to determine which power

supply is being used and to branch to normal code execution, or

to wake up event code execution. Power supply events can also

occur when the MCU core is active. To be aware of the events

that change what VSW is connected to, use the following guidelines:

•

Enable the battery switchover interrupt (EVSW) if

VSW = VDD at power-up.

•

Enable the power supply restored interrupt (EPSR) if

VSW = VBAT at power-up.

An early warning that battery switchover is about to occur is

provided by SAG detection and possibly low VDCIN detection

(see the Battery Switchover section).

For a user-controlled battery switchover, enable automatic

battery switchover on low VDD only. Then, enable the low VDCIN

event to generate the PSM interrupt. When a low VDCIN event

occurs, start data backup. Upon completion of the data backup,

enable battery switchover on low VDCIN. Battery switchover

occurs 30 ms later.

PSM1

BATTERY MODE

VSW CONNECTED TO VBAT

PSMO

NORMAL MODE

VSW CONNECTED TO VDD

PSM2

SLEEP MODE

VSW CONNECTED TO VBAT

POWER SUPPLY

RESTORED

AUTOMATIC BATTERY

SWITCHOVER

WAKEUP

EVENT

USER CODE DIRECTS MCU

TO SHUTDOWN CORE AFTER

SERVICING WAKE-UP EVENT

POWER SUPPLY

RESTORED

Figure 28. Transitioning Between Operating Modes

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