ADE7169F16 datasheet(70/140 Pages) AD

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ADE7169F16

Preliminary Technical Data

Rev. PrD | Page 70 of 140

- Background Supply Voltage Measurements

Single Supply voltage Measurement

Set the VSW_ADC_GO bit in the Start ADC Measurement SFR

(ADCGO, 0xD8) to get a supply voltage measurement. An

interrupt will be generated when the conversion is done and the

supply voltage measurement is available in the Table 49. VSW

ADC value SFR (VSWADC, 0xEF).

Background Supply Voltage Measurements

Background supply voltage measurements are disabled by

default. To configure the background supply voltage

measurement mode, set a supply voltage measurement interval

in the Peripheral ADC Strobe Period SFR (STRBPER, 0xF9).

Then supply voltage measurements will be performed

periodically in the background – see Table 45. When a supply

voltage conversion completes, the new supply voltage ADC

value is compared to the last supply voltage ADC value that

created an interrupt. If the absolute difference between the two

values is greater than the setting in the VSW_DIFF bits in the

Temperature and Supply Delta SFR (DIFFPROG, 0xF3), a VSW

ADC flag is set. This VSW ADC flag is the VSWFLAG in the

Power Management Interrupt Flag SFR (IPSMF, 0xF8), used for

power supply monitoring. This VSW ADC flag can be enabled

to generate a PSM interrupt by setting the EVSW bit in the

Power Management Interrupt Enable SFR (IPSME, 0xEC). This

method allows supply voltage measurements to take place

completely in the background, only requiring MCU activity if

the supply voltage has changed more than a configurable delta.

To set up background supply voltage measurements:

Initiate a single supply voltage measurement by setting

the VSW_ADC_GO bit in the Start ADC

Measurement SFR (ADCGO, 0xD8).

Upon completion of this measurement, configure the

VSW_DIFF[2:0] bits to establish the change in

temperature that will set the VSWFLAG in the Power

Management Interrupt Flag SFR (IPSMF, 0xF8).

Set up the interval for background supply voltage

measurements by configuring the VSW_PERIOD[1:0]

bits.

Supply voltage ADC in PSM1 and PSM2

Depending on the operating mode of the ADE7169F16, a

supply voltage conversion is initiated only by certain actions:

PSM0: In this operating mode, the 8052 is active. Supply 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 supply voltage measurements can

be initiated by setting the TEMP_ADC_GO bit in the Start

ADC Measurement SFR (ADCGO, 0xD8). Background supply

voltage measurements are not available.

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

voltage conversions are available through the background

measurement mode only.

The supply voltage Table 49. VSW ADC value SFR (VSWADC,

0xEF) is updated with a new value only when a supply voltage

ADC interrupt occurs.

Supply voltage ADC interrupt

The supply voltage ADC can generate an ADC interrupt when

at least one of the following conditions occurs:

- The difference between the new supply voltage ADC value

and the last supply voltage ADC value generating an ADC

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

- The Supply voltage ADC conversion, initiated by setting

TEMP_ADC_GO, is finished.

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

VSW ADC value SFR (VSWADC, 0xEF). Note that there is no

flag associated with this interrupt.

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