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SA9607PSA

Programmable Single Phase Energy Metering IC with Tamper Detection

South African Micro Electronic Systems 

SA9607P

TYPICAL APPLICATION

In Figure 7, the components required for a stand-alone power

metering application, is shown. Application modules as well as

application notes for the SA9607P and SA9607M Integrated

Circuits are available on request.

Two current transformers are used for mains current sensing.

The current channel showing the highest power consumption

will be selected by the SA9607P for energy metering.

The most important external components for the SA9607P

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 components

should be selected for input currents of 16µA into the

RMS

current channels of the SA9607P at IMAX (rated current of the

meter). The voltage drop on the shunt termination 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. A

capacitor is used to compensate for a phase shift introduced

by the CTs.

Bias Resistor

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

24kΩ, optimum conditions are set.

Any change to R7 will affect the output quadratically.

Compatible EEPROM Devices

The following devices were tested and found functional with

the SA9607P.

Devices Manufacturer

WEB Site

AT24C01A Atmel

http://www.atmel.com

24C01

STMicro electronics http://www.st.com

Please see various manufactures datasheets on programming

and using IIC memory devices.

Software for programming the EEPROM devices is available

from SAMES website.

http://www.sames.co.za.

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