ADE7166_15 datasheet(39/152 Pages) AD

39 / 152 page

ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/ADE7569

Rev. B | Page 39 of

152

TRANSITIONING BETWEEN OPERATING MODES

The operating mode of the ADE7116/ADE7156/ADE7166/

ADE7169/ADE7566/ADE7569 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

switchover 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, 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, 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 ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/

ADE7569 may need to wake up from PSM2 mode to service

wake-up events (see the 3.3 V Peripherals and Wake-Up Events).

PSM1 code execution begins at the power-on reset vector. After

servicing the wake-up event, the ADE7116/ADE7156/ADE7166/

ADE7169/ADE7566/ADE7569 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. 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 perf-

ormed 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 SFR 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 CONNECTED TO VBAT

PSM0

NORMAL MODE

VSWOUT CONNECTED TO VDD

PSM2

SLEEP MODE

VSWOUT CONNECTED TO VBAT

POWER SUPPLY

RESTORED

AUTOMATIC BATTERY

SWITCHOVER

WAKE-UP

EVENT

USER CODE DIRECTS MCU

TO SHUT DOWN CORE AFTER

SERVICING WAKE-UP EVENT

POWER SUPPLY

RESTORED

Figure 38. Transitioning Between Operating Modes

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