ADE5166 datasheet(74/156 Pages) AD

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ADE5166/ADE5169/ADE5566/ADE5569

Rev. B | Page 74 of 156

TEMPERATURE, BATTERY, AND SUPPLY VOLTAGE MEASUREMENTS

The ADE5166/ADE5169/ADE5566/ADE5569 include tem-

perature 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 for low

battery detection.

All ADC measurements are configured through the SFRs, as

shown in Table 49.

The temperature, battery, and supply voltage measurements can

be configured to continue functioning in PSM1 and PSM2 modes.

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 49. Temperature, Battery, and Supply Voltage Measurement SFRs

SFR

Address

R/W

Mnemonic

Description

0xF9

R/W

STRBPER

Peripheral ADC strobe period (see Table 50).

0xF3

R/W

DIFFPROG

Temperature and supply delta (see Table 51).

0xD8

R/W

ADCGO

Start ADC measurement (see Table 52).

0xFA

R/W

BATVTH

Battery detection threshold (see Table 53).

0xEF

R/W

VDCINADC

VDCINADC value (see Table 54).

0xDF

R/W

BATADC

Battery ADC value (see Table 55).

0xD7

R/W

TEMPADC

Temperature ADC value (see Table 56).

Table 50. Peripheral ADC Strobe Period SFR (STRBPER, Address 0xF9)

Bit

Mnemonic

Default

Description

[7:6]

Reserved

These bits must be kept at 0 for proper operation.

[5:4]

VDCIN_PERIOD

Period for background external voltage measurements.

VDCIN_PERIOD

Result

No VDCIN measurement

8 min

2 min

1 min

[3:2]

BATT_PERIOD

Period for background battery level measurements.

BATT_PERIOD

Result

No battery measurement

16 min

4 min

1 min

[1:0]

TEMP_PERIOD

Period for background temperature measurements.

TEMP_PERIOD

Result

No temperature measurement

8 min

2 min

1 min

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