SA2002H
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
DI R
, 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.
sames
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.
I
t
V
t
V
t
FMO
t
t MAINS
DIR
DR-01283
t DIR
t
DR-01284
Figure 9: Measured energy direction on DIR
Figure 10: Mains zero crossings on FMO
7/12
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