SA9602ESA datasheet(7/14 Pages) SAMES

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SA9602E

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The output on pin FOUT is a pulse density signal representing the instantaneous power/

energy measurement. The minimum timing characteristics are shown in the following

diagram.

TYPICAL APPLICATIONS

In the Application Circuits (Figures 1 and 2), the components required for power metering

applications, are shown.

In Figure 1 a shunt resistor is used for current sensing. In this application, the circuitry

requires a +2.5V, 0V, -2.5V DC supply.

In the case of Figure 2, when using a current transformer for current sensing, a +5V, 0V

DC supply is sufficient.

The most important external components for the SA9602E integrated circuit are:

2, R1 and RSH are the resistors defining the current level into the current sense input. The

values should be selected for an input current of 16µA

RMS into the SA9602E at maximum

line current.

Values for RSH of less than 200µ

Ω should be avoided.

1 = R2 = (IL/16µARMS) * RSH/2

Where

Line current

RSH

Shunt resistor/termination resistor

3, R6 and R4 set the current for the voltage sense input. The values should be selected

so that the input current into the voltage sense input (virtual ground) is set to 14µA

RMS.

7 defines all on-chip bias and reference currents. With R7 = 24kΩ, optimum conditions

are set. R

7 may be varied within ±10% for calibration purposes. Any change to R7 will affect

the output quadratically (i.e.: R

7 = +5%, fP = +10%).

The formula for calculating the output frequency is given below:

f = 11.16 * FOUTX *

FOSC

I .IV

3.58MHz

Where FOUTX

= Normal rated frequency (4Hz or 1160Hz)

71us min.

DR-01151

71us

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