ade7953 Analog Devices, Inc., ade7953 Datasheet - Page 35

• Manufacturer Part Number: ade7953
• Description: Single Phase, Multifunction Metering Ic With Neutral Current Measurement Ade7953
• Manufacturer: Analog Devices, Inc.

PERIOD MEASUREMENT
The ADE7953 provides a period measurement of the voltage
channel. This measurement is provided in the 16-bit, unsigned
period register (Address 0x10E). The period register is updated
once every line period and has a settling time of 30 ms to 40 ms
associated with it before the period measurement is stable.
The period measurement has a resolution of 4.48 μs/LSB
(223 kHz clock), which represents 0.0224% when the line
frequency is 50 Hz and 0.0268% when the line frequency
is 60 Hz.
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The value of the period register for a 50 Hz network is approxi-
mately 4460 in decimal (223 kHz/50 Hz) and 3716 in decimal
(223 kHz/60 Hz) for a 60 Hz network. The period register is
stable at ±1 LSB when the line is established and the measure-
ment does not change.
The following equation can be used to compute the line period
and frequency using the period register:
T
L
=
PERIOD[
223
kHz
15
] 0 :
+
1
sec
ADE7953
(36)