SA9108FFA 查看數據表（PDF） - South African Micro Electronic Systems

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SA9108FFA

TWO PHASE BIDIRECTIONAL POWER/ENERGY METERING IC WITH INSTANTANEOUS PULSE OUTPUT

South African Micro Electronic Systems 

SA9108F

5. Pulse Output Signals

The calculated power is divided down to a pulse rate 64Hz, for rated conditions on

FOUT1 and FOUT2.

Two formats of pulse output signals are available which provide both power/energy

and direction information.

The direction of the energy flow is defined by the mark/space ratio on FOUT1 while

the pulse width defines the direction on FOUT2.

Positive Energy Flow

Wave form on FOUT1

Negative Energy Flow

Wave form on FOUT2

t pp

mm

t pp

mm

t pp = 1.1ms

Wave form on DIR

t pn

mm

t pn

mm

t pn = 3.4ms

DR-00944

An integrated anticreep function ensures no metering at zero line currents.

The formula for calculating the Output Frequency (f) is given below:

FOSC (I I ) + (I I )

f = 11.16 * FOUTX * 3.58MHz *

I1 V1

I2 V2

2 * IR2

Where FOUTX = Nominal rated frequency (64Hz)

FOSC = Oscillator frequency (2MHz ...... 4MHz)

I ,I

I1 I2

I ,I

V1 V2

I

R

= Input currents for current sensor inputs (16µA at rated line current)

= Input currents for voltage sensor inputs (14µA at rated line voltage)

= Reference current (typically 50µA)

sames

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