ADE5166 datasheet(71/148 Pages) AD

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Preliminary Technical Data

ADE5166/ADE5169/ADE5566/ADE5569

Rev. PrB | Page 71 of 148

To set up background battery measurements, follow these steps:

Configure the battery detection threshold SFR (BATVTH,

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

measurement is below this threshold, the FBAT in the power

management interrupt flag SFR (IPSMF, 0xF8) is set.

Set up the interval for background battery measurements

by configuring the BATT_PERIOD[1:0] bits in the

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

Battery ADC in PSM0, PSM1, and PSM2

Depending on the operating mode, a battery conversion is

initiated only by certain actions.

•

In PSM0 operating mode, the 8052 is active. Battery

measurements are available in the background measure-

ment 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, 0xD8). 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, 0xFA),

indicating a battery voltage loss.

•

A single battery measurement initiated by setting the

BATT_ADC_GO bit finishes.

When the battery flag (FBAT) is set in the power management

interrupt flag SFR (IPSMF, 0xF8), a new ADC value is available

in the battery ADC value SFR (BATADC, 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 is ready.

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

new value only when the battery flag is set in the power manage-

ment interrupt flag SFR (IPSMF, 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. An 8-bit SFR, the VDCIN ADC value SFR

(VDCINADC, 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: a

single external voltage measurement or 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, 0xD8). An interrupt is generated when the conversion

is done and when the external voltage measurement is available

in the VDCIN ADC value SFR (VDCINADC, 0xEF).

Background External Voltage Measurements

Background external voltage measurements are disabled

by default. To configure the background external voltage

measurement mode, set an external voltage measurement

interval in the peripheral ADC strobe period SFR (STRBPER,

0xF9). External voltage measurements are performed periodi-

cally in the background (see Table 49).

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 in

the VDCIN_DIFF[2:0] bits in the temperature and supply delta

SFR (DIFFPROG, 0xF3), a VDCIN ADC flag is set. This VDCIN

ADC flag is FVADC in the power management interrupt flag

SFR (IPSMF, 0xF8), which is used for power supply management.

This VDCIN ADC flag can be enabled to generate a PSM interrupt

by setting the EVADC bit in the power management interrupt

enable SFR (IPSME, 0xEC).

This method allows external voltage measurements to take

place completely in the background, only requiring MCU

activity if the external voltage has changed more than a

configurable delta.

To set up background external voltage measurements, follow

these steps:

Initiate a single external voltage measurement by setting

the VDCIN_ADC_GO bit in the start ADC measurement

SFR (ADCGO, 0xD8).

Upon completion of this measurement, configure the

VDCIN_DIFF[2:0] bits to establish the change in voltage

that sets the FVDCIN in the power management interrupt

flag SFR (IPSMF, 0xF8).

Set up the interval for background external voltage measure-

ments by configuring the VDCIN_PERIOD[1:0] bits in the

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

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