ADE7569 datasheet(68/136 Pages) AD

68 / 136 page

ADE7566/ADE7569

Preliminary Technical Data

Rev. PrA | Page 68 of 136

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

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, 0xD8). Background

battery measurements are not available.

•

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

conversions are available through the background

measurement mode only.

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

Management Interrupt Flag SFR (IPSMF, 0xF8).

EXTERNAL VOLTAGE MEASUREMENT

The ADE7566/ADE7569 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 TBD V/LSB. There are two ways to

initiate an external voltage conversion: a single external voltage

measurement or a background external voltage measurement.

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

periodically in the background (see Table 45).

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 the FVDCIN in the Power Management

Interrupt Flag SFR (IPSMF, 0xF8), which is used for power

supply monitoring. This VDCIN ADC flag can be enabled to

generate a PSM interrupt by setting the EVDCIN 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 will set the FVDCIN in the Power Management

Interrupt Flag SFR (IPSMF, 0xF8).

Set up the interval for background external voltage

measurements by configuring the VDCIN_PERIOD[1:0] bits

in the Peripheral ADC Strobe Period SFR (STRBPER,

0xF9).

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