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SA9607M

Single Phase Power/Energy Metering IC with Tamper Detection

South African Micro Electronic Systems 

SA9607M

FUNCTIONAL DESCRIPTION

The SA9607M is a CMOS mixed signal analog/digital integrated

circuit, which performs power/energy calculations across a

power range of 1000:1, to an overall accurancy of better than

Class 1.

The integrated circuit includes all the required functions for 1-

phase power and energy measurement such as oversampling

A/D converters for the voltage and current sense inputs,

power calculation and energy integration. Internal offsets are

eliminated through the use of cancellation procedures. The

SA9607M incorporates an anti-tamper scheme by continuously

measuring the power consumption on both LIVE and NEUTRAL

lines. A fault is indicated when these measurements differ by

more than 12.5%. The SA9607M generates pulses with a

frequency proportional to the larger of the two current

measurements. The source (LIVE or NEUTRAL) for these

pulses is indicated on the SEL1 pin.

Frequency outputs (MOP, MON and LED) are available. The

pulse rate on these pins follows the instantaneous active

power consumption measured.

A low voltage stepper may be driven directly from the device

by connecting it between the MOP and MON pins, alternatively

an impulse impulse counter may be driven directly by connecting

it between MOP and VSS.

POWER CALCULATION

In the Application Circuit (Figure 7), the voltage drop across

the shunt will be between 0 and 16mVRMS (0 to 80A through a

shunt resistor of 200µΩ). The voltage accross the current

transformers terminating resistor will also be between 0 and

16mV These voltages are converted to currents of between

RMS.

0 and 16µARMS for each current sense inputs by means of

resistors R1 and R2 (channel 1) as well as R3 and R4. (channel

2).

The current sense input saturates at an input current of ±25µA

peak.

For the voltage sensor input, the mains voltage (230VAC) is

divided down through a divider to 14VRMS. The current into the

A/D converter input is set at 14µARMS at nominal mains voltage,

via resistor R6 (1MΩ).

Different pulse rates are available at the MOP and MON pins.

The device may be programmed for a 1 pulse/kWh, 10 pulses/

kWh or 100 pulses/kWh output, depending on the status of

the motor pulse rate select pins MP0 and MP1.

The LED pulse rate is fixed at 6400 pulses per kWh. Rated

conditions such as 230V/20A, 230V/40A and 230V/60A may

be chosen with the rated pin. This facility allows meter

manufacturers to cater for a wide range of metering applications

with minimal design changes.

ANALOG INPUT CONFIGURATION

The input circuitry of the current and voltage sensor inputs are

illustrated below.

These inputs are protected against electrostatic discharge

through clamping diodes.

The feedback loops from the outputs of the amplifiers AI and

AV generate virtual shorts on the signal inputs. Exact

duplications of the input currents are generated for the analog

signal processing circuitry.

ELECTROSTATIC DISCHARGE (ESD)

PROTECTION

The SA9607M integrated circuit's input's/outputs are protected

against ESD.

POWER CONSUMPTION

The power consumption rating of the SA9607M integrated

circuit is less than 30mW.

V DD

IIP

CURRENT

V SS

SENSOR

INPUTS

V DD

IIN

VSS

VDD

IVP

VOLTAGE

SENSOR

V SS

INPUT

AI

AV

DR-01288

GND

Figure 3: Analog Input Internal Configuration

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

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