SA2002 Sames, SA2002 Datasheet - Page 7

• Manufacturer Part Number: SA2002
• Description: Single Phase Bi-directional Power / Energy Metering IC with Instantaneous Pulse Output
• Manufacturer: Sames

Direction indication (DIRO)
Note that the DIR output is not available in the DIP-8 package
type. Figure 9 shows the behavior of DIR, when energy
reversal takes place. The time period for the DIR signal to
change state, t , is the time it takes for the internal integrator
to count (down) from its present value to zero. Thus the energy
consumption rate determines the speed of change on DIR.
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SA2002H
I
V
DIR
DR-01283
Figure 9: Measured energy direction on DIR
DIR
t
DIR
t
t
t
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Mains zero crossing indication (FMO)
Note that the FMO output is not available in the DIP-8 package
type. The square wave signal of FMO indicates the polarity of
the mains voltage. Due to comparator offsets, the FMO low to
high transition can occur within a range as shown in figure 10.
The time between successive low to high transitions will be
equal to the mains voltage period.
FMO
V
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Figure 10: Mains zero crossings on FMO
t
MAINS
sames
sames
t
t