ADE7166 datasheet(35/144 Pages) AD

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ADE7566/ADE7569/ADE7166/ADE7169

Rev. A | Page 35 of 144

TRANSITIONING BETWEEN OPERATING MODES

The operating mode of the ADE7566/ADE7569/ADE7166/

ADE7169 is determined by the power supply connected to

VSWOUT. Therefore, changes in the power supply, such as when

VSWOUT switches from VDD to VBAT or when VSWOUT switches to

VDD, alter 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), VSWOUT 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 VSWOUT 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/ADE7166/ADE7169 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/ADE7166/

ADE7169 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 VSWOUT 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 restart. PSM0 code execution begins at the power-

on reset vector.

Automatic Switch to VDD (PSM1 to PSM0)

If the conditions to switch VSWOUT 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 VSWOUT must be known at all times. The VSWSOURCE

bit in the Peripheral Configuration SFR (PERIPH, 0xF4)

indicates what VSWOUT is connected to (see Table 19). 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

PERIPH SRF 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 VSWOUT is connected to, use the following guidelines:

•

Enable the battery switchover interrupt (EBSO)

if VSWOUT = VDD at power-up.

•

Enable the power supply restored interrupt (EPSR)

if VSWOUT = 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.

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