ADE5166 datasheet(37/156 Pages) AD

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ADE5166/ADE5169/ADE5566/ADE5569

Rev. B | Page 37 of 156

TRANSITIONING BETWEEN OPERATING MODES

The operating mode of the ADE5166/ADE5169/ADE5566/

ADE5569 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 occurs (see the

Battery Switchover section), VSWOUT switches to VBAT. This switch-

over results in a transition from 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, user code can initiate a transition to PSM2 mode.

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, Address 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 ADE5166/ADE5169/ADE5566/ADE5569 may need to

wake up from PSM2 mode 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 ADE5166/ADE5169/ADE5566/ADE5569

can return to PSM2 mode by setting Bit 4 in the power control SFR

(POWCON, Address 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

mode. 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 mode. 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, Address 0xF4)

indicates the power supply to which VSWOUT is connected (see

Table 20). 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, by low VDCIN detection

(see the Battery Switchover section).

For a user-controlled battery switchover, enable automatic battery

switchover on low VDD only. Next, 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

VSWOUT IS CONNECTED TO VBAT

PSM0

NORMAL MODE

VSWOUT IS CONNECTED TO VDD

PSM2

SLEEP MODE

VSWOUT IS CONNECTED TO VBAT

POWER SUPPLY

RESTORED

AUTOMATIC BATTERY

SWITCHOVER

WAKE-UP

EVENT

USER CODE DIRECTS MCU

TO SHUT DOWN CORE AFTER

SERVICING A WAKE-UP EVENT

POWER SUPPLY

RESTORED

Figure 38. Transitioning Between Operating Modes

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