ADE7169F16 datasheet(66/140 Pages) AD

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Preliminary Technical Data

ADE7169F16

Rev. PrD | Page 66 of 140

TEMPERATURE, BATTERY AND SUPPLY

VOLTAGE MEASUREMENTS

The ADE7169F16 includes 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 doesn’t 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 SFR detailed in Table 44.

The temperature, battery and supply 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 44. Temperature, Battery and Supply 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

VSWADC

VSW ADC value

0xDF

R/W

BATADC

Battery ADC value

0xD7

R/W

TEMPADC

Temperature ADC value

Table 45. 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 supply voltage measurements

VSW_PERIOD[1:0]

No VSW measurement

8 minutes

2 minutes

5-4

VSW_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

8 minutes

1-0

TEMP_PERIOD[1:0]

2 minutes

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