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SA9607PPA

Programmable Single Phase Energy Metering IC with Tamper Detection

South African Micro Electronic Systems 

SA9607P

FUNCTIONAL DESCRIPTION

The SA9607P is a CMOS mixed signal analog/digital integrated

circuit, which performs power/energy calculations across a

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

Class 1.

The integrated circuit includes all the required functions for

single 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 SA9607P 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 SA9607P

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.

Various pulse outputs (MOP, MON and LED) are available.

The pulse rate on these pins follows the 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 counter may be driven directly by connecting it

between MOP and V .

SS

The SA9607P configures itself from an external low cost

EEPROM that contain all meter configurations and calibration

data. No external trimming is required for this device. Calibration

of the device may be fully automated.

POWER CALCULATION

In Figure 7, the voltage drop across the current transformers

terminating resistor will be between 0 and 16mVRMS. These

voltages are converted to currents for each current sense

input, 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. The mains voltage (230VAC) is divided down through a

divider to 14VRMS. The current into the A/D converter input is

set

at

14µA

RMS

at

nominal

mains

voltage,

via

resistor

R

6

(1MΩ).

See Device Configuration for more details on the processing

of measured energy to frequency outputs.

ANALOG INPUT CONFIGURATION

The input circuitry of the current and voltage sensor inputs are

illustrated in figure 3. These inputs are protected against

electrostatic discharge through clamping diodes.

The feedback loops from the outputs of the amplifiers A and

I

AV generate virtual shorts on the signal inputs. Exact

duplications of the input currents are generated for the analog

signal processing circuitry.

AUTOMATIC DEVICE CONFIGURATION (BOOT UP)

During power up, registers containing configuration and

calibration information is updated from an external EEPROM.

The device itself never writes to the EEPROM so any write

protect features offered by manufacturer of EEPROM's may

be used to protect the configuration and calibration constants

of the meter. The device reloads its configuration every 1193

seconds from the external EEPROM in order to ensure correct

operation of the meter. Every data byte stored in the EEPROM

is protected with a checksum byte to ensure data integrity.

ELECTROSTATIC DISCHARGE (ESD)

PROTECTION

The SA9607P integrated circuit's input's/outputs are protected

against ESD.

POWER CONSUMPTION

The power consumption rating of the SA9607P 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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