ade7566 Analog Devices, Inc., ade7566 Datasheet - Page 65

• Manufacturer Part Number: ade7566
• Description: Single-phase Energy Measurement Ic With 8052 Mcu, Rtc, And Lcd Driver
• Manufacturer: Analog Devices, Inc.

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.
Table 46. Temperature, Battery, and Supply Voltage Measurement SFRs
SFR Address
0xF9
0xF3
0xD8
0xFA
0xEF
0xDF
0xD7
Table 47. Peripheral ADC Strobe Period SFR (STRBPER, 0xF9)
Bit No.
7 to 6
5 to 4
3 to 2
1 to 0
1
The strobing option only works when the RTCEN bit in RTC Configuration SFR (TIMECON, 0xA1) is set.
Mnemonic
Reserved
VDCIN_PERIOD[1:0]
BATT_PERIOD[1:0]
TEMP_PERIOD[1:0]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Name
STRBPER
DIFFPROG
ADCGO
BATVTH
VDCINADC
BATADC
TEMPADC
Default
00
0
0
0
Strobing Period Configuration (see Table 47).
Battery Detection Threshold Configuration (see Table 50).
Temperature ADC Value (see Table 53).
Description
Temperature and Supply Delta Configuration (see Table 48).
Start ADC Configuration (see Table 49).
V
Battery ADC Value (see Table 52).
DCIN
ADC Value (see Table 51).
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Description
These bits should be left clear for proper operation.
Period for background external voltage measurements.
VDCIN_PERIOD[1:0]
00
01
10
11
Period for background battery level measurements.
BATT_PERIOD[1:0]
00
01
10
11
Period for background temperature measurements.
TEMP_PERIOD[1:0]
00
01
10
11
1
All ADC measurements are configured through the SFRs
detailed in Table 46.
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.
Result
No V
8 min
2 min
1 min
Result
No battery measurement
16 min
4 min
1 min
Result
No temperature measurements
8 min
2 min
1 min
DCIN
measurement
ADE7566/ADE7569