ADE5166 datasheet(77/156 Pages) AD

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ADE5166/ADE5169/ADE5566/ADE5569

Rev. B | Page 77 of 156

This method allows battery measurement to take place completely

in the background, requiring MCU activity only if the battery

drops below a user-specified threshold. To set up background

battery measurements, follow these steps:

Configure the battery detection threshold SFR (BATVTH,

Address 0xFA) to establish a low battery threshold. If the

BATADC measurement is below this threshold, the FBAT bit

(Bit 2) in the power management interrupt flag SFR (IPSMF,

Address 0xF8) is set.

Set up the interval for background battery measurements

by configuring the BATT_PERIOD bits in the peripheral

ADC strobe period SFR (STRBPER, Adress 0xF9[3:2]).

Battery ADC in PSM0, PSM1, and PSM2 Modes

Depending on the operating mode, a battery conversion is

initiated only by certain actions.

•

In PSM0 operating mode, the 8052 is active. Battery mea-

surements are available in the background measurement

mode and by initiating a single measurement.

•

In PSM1 operating mode, the 8052 is active, and the part

is battery powered. Single battery measurements can be

initiated by setting the BATT_ADC_GO bit in the start

ADC measurement SFR (ADCGO, Address 0xD8[0]).

Background battery measurements are not available.

•

In PSM2 operating mode, the 8052 is not active. Unlike

temperature and VDCIN measurements, the battery

conversions are not available in this mode.

Battery ADC Interrupt

The battery ADC can generate an ADC interrupt when at least

one of the following conditions occurs:

•

The new battery ADC value is smaller than the value

set in the battery detection threshold SFR (BATVTH,

Address 0xFA), indicating a battery voltage loss.

•

A single battery measurement, initiated by setting the

BATT_ADC_GO bit in the start ADC measurement SFR

(ADCGO, Address 0xD8[0]), finishes.

When the battery flag (FBAT, Bit 2) is set in the power manage-

ment interrupt flag SFR (IPSMF, Address 0xF8), a new ADC

value is available in the battery ADC value SFR (BATADC,

Address 0xDF). This battery flag can be enabled as a source of the

PSM interrupt to generate a PSM interrupt every time the battery

drops below a set voltage threshold or after a single conversion

initiated by setting the BATT_ADC_GO bit in the start ADC

measurement SFR (ADCGO, Address 0xD8[0]) is ready.

The battery ADC value SFR (BATADC, Address 0xDF) is updated

with a new value only when the battery flag (FBAT) is set in the

power management interrupt flag SFR (IPSMF, Address 0xF8).

EXTERNAL VOLTAGE MEASUREMENT

The ADE5166/ADE5169/ADE5566/ADE5569 include a dedicated

ADC to provide a digital measurement of an external voltage on

the VDCIN pin. The 8-bit VDCINADC value SFR (VDCINADC,

Address 0xEF) holds the results of the conversion. The resolution

of the external voltage measurement is 15.3 mV/LSB. There are

two ways to initiate an external voltage conversion: by using a single

external voltage measurement or through background external

voltage measurements.

Single External Voltage Measurement

To obtain an external voltage measurement, set the VDCIN_

ADC_GO bit in the start ADC measurement SFR (ADCGO,

Address 0xD8[2]). An interrupt is generated when the conversion

is done and when the external voltage measurement is available

in the VDCINADC value SFR (VDCINADC, Address 0xEF).

Background External Voltage Measurements

Background external voltage measurements are disabled by

default. To configure the background external voltage measure-

ment mode, set an external voltage measurement interval in the

peripheral ADC strobe period SFR (STRBPER, Address 0xF9).

External voltage measurements are performed periodically in

the background (see Table 50).

When an external voltage conversion is complete, the new

external voltage ADC value is compared to the last external

voltage ADC value that created an interrupt. If the absolute

difference between the two values is greater than the setting of

the VDCIN_DIFF bits in the temperature and supply delta SFR

(DIFFPROG, Address 0xF3[2:0]), a VDCINADC flag is set. This

VDCINADC flag is FVADC (Bit 3) in the power management

interrupt flag SFR (IPSMF, Address 0xF8), which is used for power

supply management. This VDCINADC flag can be enabled to

generate a PSM interrupt by setting the EVADC bit (Bit 3) in the

power management interrupt enable SFR (IPSME, Address 0xEC).

This method allows external voltage measurements to take

place completely in the background, requiring MCU activity

only if the external voltage has changed more than a confi-

gurable delta.

To set up background external voltage measurements

Initiate a single external voltage measurement by setting

the VDCIN_ADC_GO bit in the start ADC measurement

SFR (ADCGO, Address 0xD8[2]).

Upon completion of this measurement, configure the

VDCIN_DIFF bits in the temperature and supply delta SFR

(DIFFPROG, Address 0xF3[2:0]) to establish the change

in voltage that sets the FVADC bit in the power manage-ment

interrupt flag SFR (IPSMF, Address 0xF8[3]).

Set up the interval for the background external voltage

measurements by configuring the VDCIN_PERIOD bits in

the peripheral ADC strobe period SFR (STRBPER,

Address 0xF9[5:4]).

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