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SA9602MSA

SINGLE PHASE POWER/ENERGY METERING IC WITH SELECTABLE PULSE RATE FOR MECHANICAL DISPLAY APPLICATIONS

South African Micro Electronic Systems 

SA9602M

The SA9602M allows selection of the form of energy to be measured: forward

energy, reverse energy, or bidirectional energy. Selection is achieved by means of

the DIRI input. A table of possible settings for DIRI is shown below:

DIRECTION SELECTION

Signal Input DIRI Description

Condition

0

1

DIRO

Motor pulses only for

reverse energy

Motor pulses only for

forward energy

Motor pulse for

bidirectional energy

Default pull up input

DIRO connected to

DIRI

7. Rated Condition Select

The user selectable output frequencies for the MOTOR output and LED pulse rate

will allow a meter manufacturer to build meters for a 5-4-3-2 scaling ratio of rated

current.

The table below shows the various options which can be selected using pins R0 and

R1.

RATED CONDITION SELECT

MD R1 R0 Rated Conditions

10

10

11

11

0 230V / 40A

1 230V / 60A

0 230V / 80A

1 230V / 100A

LED Output (1000

pulses/kWh)

2.55Hz

3.83Hz

5.11Hz

6.39Hz

Scaling of the frequency for the MOTOR drive output pulses takes effect in the

same manner as shown for the LED output pulse rate.

This feature is particularly useful in circumstances where a manufacturer requires

a meter for use in a system rated for two different conditions, for exampe 230V/80A

and 230V/40A. Previously such a requirement would have necessitated alteration

of both the input current sensing resistors and the output measuring/counting block.

With the rated condition select, using R0 and R1, the SA9602M allows for the

development of different rated meters requiring minimal changes.

sames

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