ADE7569 datasheet(73/144 Pages) AD

73 / 144 page

ADE7566/ADE7569/ADE7166/ADE7169

Rev. A | Page 73 of 144

TEMPERATURE, BATTERY, AND SUPPLY VOLTAGE MEASUREMENTS

The ADE7566/ADE7569/ADE7166/ADE7169 include

temperature measurements as well as battery and supply voltage

measurements. These measurements enable many forms of

compensation. The temperature and supply voltage measurements

can be used to compensate external circuitry. The RTC can be

calibrated over temperature to ensure that it does not drift. Supply

voltage measurements allow the LCD contrast to be maintained

despite variations in voltage. Battery measurements allow low

battery detection to be performed.

All ADC measurements are configured through the SFRs

detailed in Table 47.

The temperature, battery, and supply voltage measurements can

be configured to continue functioning in PSM1 and PSM2.

Keeping the temperature measurement active ensures that it is

not necessary to wait for the temperature measurement to settle

before using it for compensation.

Table 47. Temperature, Battery, and Supply Voltage Measurement SFRs

SFR Address

R/W

Name

Description

0xF9

R/W

STRBPER

Peripheral ADC Strobe Period (see Table 48).

0xF3

R/W

DIFFPROG

Temperature and Supply Delta Configuration (see Table 49).

0xD8

R/W

ADCGO

Start ADC Measurement (see Table 50).

0xFA

R/W

BATVTH

Battery Detection Threshold (see Table 51).

0xEF

R/W

VDCINADC

VDCIN ADC Value (see Table 52).

0xDF

R/W

BATADC

Battery ADC Value (see Table 53).

0xD7

R/W

TEMPADC

Temperature ADC Value (see Table 54).

Table 48. Peripheral ADC Strobe Period SFR (STRBPER, 0xF9)1

Bit

Mnemonic

Default

Description

7 to 6

Reserved

These bits should be left clear for proper operation.

Period for background external voltage measurements.

VDCIN_PERIOD[1:0]

Result

No VDCIN measurement

8 min

2 min

5 to 4

VDCIN_PERIOD[1:0]

1 min

Period for background battery level measurements.

BATT_PERIOD[1:0]

Result

No battery measurement

16 min

4 min

3 to 2

BATT_PERIOD[1:0]

1 min

Period for background temperature measurements.

TEMP_PERIOD[1:0]

Result

No temperature measurements

8 min

2 min

1 to 0

TEMP_PERIOD[1:0]

1 min

1 The strobing option only works when the RTCEN bit in RTC Configuration SFR (TIMECON, 0xA1) is set.

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