ADE7169 datasheet(72/148 Pages) AD

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ADE75xx/ADE71xx

Preliminary Technical Data

Rev. PrE | Page 72 of 148

new value only when the Battery flag is set in the Power

Management Interrupt Flag SFR (IPSMF, 0xF8).

EXTERNAL VOLTAGE MEASUREMENT

The ADE75XX/ADE71XX includes a dedicated ADC to provide

a digital measurement of an external voltage, on the VDCIN pin.

An 8-bit SFR (Table 50. 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:

- Single External Voltage Measurement

- Background ExternalVoltage Measurements

Single External voltage Measurement

Set the VADC bit in the Start ADC Measurement SFR

(ADCGO, 0xD8) to get an external voltage measurement. An

interrupt will be generated when the conversion is done and the

external voltage measurement is available in the Table 50.

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). Then external voltage measurements will be performed

periodically in the background – see Table 46. When an external

voltage conversion completes, 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 bits in the

Temperature and Voltage ADC Delta SFR (DIFFPROG, 0xF3), a

VDCIN ADC flag is set. This VDCIN ADC flag is the FVADC

in the Power Management Interrupt Flag SFR (IPSMF, 0xF8),

used for power supply monitoring. 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:

Initiate a single external voltage measurement by

setting the VADC 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 FVADC 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.

External voltage ADC in PSM1 and PSM2

Depending on the operating mode of the

ADE75XX/ADE71XX, an external voltage conversion is

initiated only by certain actions:

PSM0: In this operating mode, the 8052 is active. External

voltage measurements are available in the background

measurement mode and by initiating a single measurement.

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

powered from battery. Single external voltage measurements

can be initiated by setting the VADC bit in the Start ADC

Measurement SFR (ADCGO, 0xD8). Background external

voltage measurements are not available.

PSM2: In this operating mode, the 8052 is not active. External

voltage conversions are available through the background

measurement mode only.

The external voltage ADC, VDCIN ADC value SFR

(VDCINADC, 0xEF), is updated with a new value only when an

external voltage ADC interrupt occurs.

External voltage ADC interrupt

The external voltage ADC can generate an ADC interrupt when

at least one of the following conditions occurs:

- The difference between the new external voltage ADC value

and the last external voltage ADC value generating an ADC

interrupt is larger than the value set in the VDCIN_DIFF bits.

- The External voltage ADC conversion, initiated by setting

TEMP_ADC_GO, is finished.

When the ADC interrupt occurs, a new value is available in the

VDCIN ADC value SFR (VDCINADC, 0xEF). Note that there

is no flag associated with this interrupt.

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