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SA2002

Single Phase Bi-directional Power / Energy Metering IC with Instantaneous Pulse Output

South African Micro Electronic Systems 

SA2002H

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, tDIR, 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.

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

V

t

t

V

t

DIR

DR-01283

t

t DIR

Figure 9: Measured energy direction on DIR

FMO

t

t MAINS

DR-01284

Figure 10: Mains zero crossings on FMO

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