SA9122EFA Ver la hoja de datos (PDF) - South African Micro Electronic Systems

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SA9122EFA

SINGLE PHASE UNIDIRECTIONAL POWER/ENERGY METERING IC WITH SEPERATE 64 SEGMENT LCD DRIVER

South African Micro Electronic Systems 

SA9122E

The formula for calculating the output frequency is given below:

f = 11.16

*

FOUTX

FOSC

* 3.58MHz

*

II .IV

I2

R

Where FOUTX = Normal rated frequency (4Hz or 1160Hz)

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

II

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

I

= Input current for voltage sensor input (14µA at rated line voltage)

V

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.

sames

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