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Preliminary Technical Data

ADE5166/ADE5169/ADE5566/ADE5569

Rev. PrB | Page 31 of 148

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 occur (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, 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 ADE5166/ADE5169/ADE5566/ADE5569 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 execu-

tion begins at the power-on reset vector. After servicing the

wake-up event, the ADE5166/ADE5169/ADE5566/ ADE5569

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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