ADE7166 datasheet(68/148 Pages) AD

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ADE75xx/ADE71xx

Preliminary Technical Data

Rev. PrE | Page 68 of 148

TEMPERATURE, BATTERY AND EXTERNAL

VOLTAGE MEASUREMENTS

The ADE75XX/ADE71XX includes temperature measurements

as well as battery and an external voltage measurements. These

measurements enable many forms of compensation. The

temperature measurements can be used to compensate external

circuitry. The RTC can be calibrated over temperature to ensure

that it doesn’t drift. External voltage measurements allow the

VDCIN voltage to be monitored, which is especially useful if

the VDCIN voltage tracks the bulk voltage. Battery

measurements allow low battery detection to be performed. All

ADC measurements are configured through the SFR detailed in

Table 45.

The temperature, battery and external voltage measurements

can be configured to still be functional in PSM1 and PSM2.

This is done bit setting bit RTCEN in the RTC Configuration

SFR (TIMECON, 0xA1). Maintaining the temperature

measurement active ensures that it is not necessary to wait for

the temperature measurement to settle before using it for

compensation.

Table 45. Temperature, Battery and External voltage measurement SFRs

SFR

address

(hex)

R/W

Name

Description

0xF9

R/W

STRBPER

Strobing period configuration

0xF3

R/W

DIFFPROG

Temperature and supply Delta configuration

0xD8

R/W

ADCGO

ADC start configuration

0xFA

R/W

BATVTH

Battery threshold configuration

0xEF

R/W

VDCINADC

VDCIN ADC value

0xDF

R/W

BATADC

Battery ADC value

0xD7

R/W

TEMPADC

Temperature ADC value

Table 46. Peripheral ADC Strobe Period SFR (STRBPER, 0xF9)

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

Bit

Location

Bit

Mnemonic

Default

Value

Description

7-6

Reserved

Period for background external voltage measurements

VDCIN_PERIOD[1:0]

No VDCIN measurement

8 minutes

2 minutes

5-4

VDCIN_PERIOD[1:0]

1 minute

Period for background battery level measurements

BATT_PERIOD[1:0]

No Battery measurement

16 minutes

4 minutes

3-2

BATT_PERIOD[1:0]

1 minute

Period for background temperature measurements

TEMP_PERIOD[1:0]

No Temperature measurements

1-0

TEMP_PERIOD[1:0]

8 minutes

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