EVAL-ADE7569F16EB datasheet(65/136 Pages) AD

65 / 136 page

Preliminary Technical Data

ADE7566/ADE7569

Rev. PrA | Page 65 of 136

TEMPERATURE, BATTERY, AND SUPPLY VOLTAGE MEASUREMENTS

The ADE7566/ADE7569 include temperature measurements as

well as battery and supply voltage measurements. These measure-

ments 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 44.

The temperature, battery, and supply voltage measurements can

be configured to continue functioning in PSM1 and PSM2. This

is done by setting Bit RTCEN in the RTC Configuration SFR

(TIMECON, 0xA1). 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 44. Temperature, Battery, and Supply Voltage Measurement SFRs

SFR Address

R/W

Name

Description

0xF9

R/W

STRBPER

Strobing Period Configuration (see Table 45).

0xF3

R/W

DIFFPROG

Temperature and Supply Delta Configuration (see Table 46).

0xD8

R/W

ADCGO

ADC Start Configuration (see Table 47).

0xFA

R/W

BATVTH

Battery Threshold Configuration (see Table 48).

0xEF

R/W

VDCINADC

VDCIN ADC Value (see Table 49).

0xDF

R/W

BATADC

Battery ADC Value (see Table 50).

0xD7

R/W

TEMPADC

Temperature ADC Value (see Table 51).

Table 45. Peripheral ADC Strobe Period SFR (STRBPER, 0xF9)1

Bit No.

Mnemonic

Default

Description

7 to 6

Reserved

–

Reserved.

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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