ADE7166 datasheet(26/148 Pages) AD

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ADE75xx/ADE71xx

Preliminary Technical Data

Rev. PrE | Page 26 of 148

METER_OFF

Set this bit to turn off the modulators and energy metering DSP circuitry to reduce power if

metering functions are not needed in PSM0

RESERVED

COREOFF

Set this bit to shut down the core if in the PSM1 operating mode.

RESERVED

Controls the core clock frequency, Fcore. Fcore=4.096MHz/2CD

CD[2:0]

Fcore (MHz)

4.096

2.048

1.024

0.512

0.256

0.128

0.064

2-0

CD[2:0]

010

0.032

Note: The POWCON register must be unlocked by first writing to the KYREG key register. The KYREG SFR is set to 0xA7 to unlock the

POWCON SFR and then the POWCON SFR can be modified. For example:

MOV KYREG,#0A7h

;Write KYREG to 0xA7 to get write access to the POWCON SFR

MOV POWCON, #10H

;Shutdown the core

POWER SUPPLY ARCHITECTURE

ADE75XX/ADE71XX has two power supply inputs, VDD and

VBAT, and requires only a single 3.3V power supply at VDD for

full operation. A battery backup, or secondary power supply,

with a maximum of 3.6V can be connected to the VBAT input.

Internally, the ADE75XX/ADE71XX connects VDD or VBAT to

VSW, which is used to derive the power for the

ADE75XX/ADE71XX circuitry. The VSWOUT output pin reflects

the voltage at VSW, and has a maximum output current of TBD

mA. This pin may also be used to power a limited number of

peripheral components. The 2.5V analog supply, VINTA and the

2.5V supply for the core logic, VINTD, are derived by on-chip

linear regulators from VSW. Figure 9 shows the power supply

architecture of ADE75XX/ADE71XX.

The ADE75XX/ADE71XX provides automatic battery

switchover between VDD and VBAT based on the voltage level

detected at VDD or VDCIN. Additionally, the BCTRL input can

also be used to trigger a battery switchover. The conditions for

switching VSW from VDD to VBAT and back to VDD are described

in the Battery Switchover section.

VDCIN is an input pin that can be connected to a 0V to 3.3V DC

signal. This input is intended for power supply supervisory

purposes and does not provide power to the

ADE75XX/ADE71XX circuitry - see Battery Switchover section.

MCU

SCRATCHPAD

LCD

RTC

TEMPERATURE ADC

DCIN

INTD

INTA

3.3V

2.5V

LDO

BAT

SWOUT

BCTRL

ADE

SPI/I2C

UART

LDO

POWER SUPPLY

MANAGEMENT

ADC

Figure 9: Power Supply Architecture

BATTERY SWITCHOVER

ADE75XX/ADE71XX monitors VDD, VBAT, and VDCIN.

Automatic battery switchover from VDD to VBAT can be

configured based on the status of VDD, VDCIN, or the BCTRL pin.

Battery switchover is enabled by default. Setting bit 1 in the

Battery Switchover Configuration SFR (BATPR, 0xF5), disables

battery switchover so that VDD is always connected to VSW. The

source of VSW is indicated by bit 6 in the Peripheral

Configuration SFR (PERIPH, 0xF4), which is set when VSW is

connected to VDD and cleared when VSW is connected to VBAT.

The battery switchover functionality provided by the

ADE75XX/ADE71XX allows a seamless transition from VDD to

VBAT. An automatic battery switchover option ensures a stable

power supply to the ADE75XX/ADE71XX, as long as the

external battery voltage is above TBD V. It allows continuous

code execution even while the internal power supply is

switching from VDD to VBAT and back. Note that the energy

metering ADCs are not available when VBAT is being used for

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