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SA9607MSA

Single Phase Power/Energy Metering IC with Tamper Detection

South African Micro Electronic Systems 

SA9607M

TYPICAL APPLICATION

In Figure 1, the components required for a stand-alone power

metering application, is shown.

Current transformers are used for mains current sensing. The

channel showing the highest power consumption will be

selected by the SA9607M for energy metering.

The most important external components for the SA9607M

integrated circuit are the current sense resistors, the voltage

sense resistors as well as the bias setting resistor.

Current Sense Resistors

The resistors R1, R2, R3 and R4 define the current level into

the current sense inputs of the device. The component should

be selected for input currents of 16µARMS into the current

channels of the SA9607M at IMAX (rated current of the meter).

The voltage drop of the resistors R10 and R17 should be at least

20mV.

Current Channel 1

R1= R2= (IL/16µARMS) x R10/2

Current Channel 2

R3= R4= (IL/16µARMS) x R11/2

Where:

IL = Line current/CT-ratio

R10 = Termination resistor

R11 = Termination resistor

Voltage Sense Resistors

R9, R8, R6 and R5 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 14µARMS.

Bias Resistor

R7 defines all on-chip bias and reference currents. With R7 =

24kΩ, optimum conditions are set.

R7 may be varied within ±10% for calibration purposes. Any

change to R7 will affect the output quadratically (i.e.: R7 = +5%,

fP = +10%).

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