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SA9105AFA

THREE PHASE UNIDIRECTIONAL POWER/ENERGY METERING IC WITH PULSE OUTPUT

South African Micro Electronic Systems 

SA9105A

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

FOSC (I I ) + (I I ) + (I I )

f = 11.16 * FOUTX * 3.58MHz * I1 V1

I2 V2

I3 V3

3

*

I2

R

Where FOUTX = Nominal rated frequency (4Hz, 290Hz or 1160Hz)

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

II1, II2, II3 = Input currents for current inputs (16µA at rated)

IV1, IV2, IV3 = Input currents for voltage inputs (14µA at rated)

IR

= Reference current (typically 50µA)

XTAL is a colour burst TV crystal (f = 3.5795 MHz) for the oscillator. The oscillator

frequency is divided down to 1.7897 MHz on-chip, to supply the digital circuitry and the

A/D converters.

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