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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

For example, a meter manufacturer may wish to build

(a) Meter rated for 230V/80A, 1000 pulses/kWh

(b) Meter rated for 230V/40A, 1000 pulses/kWh

If the LED output pulse rate is considered, then

(a) 230V/80A, R1=1 and R0=0

The table of Rated Condition Select shows that for this case the frequency for the

LED output at rated conditions is 5.11Hz.

Hence,

1 pulse =

VI

=

f

p

230 x 80

5.11

˜

3600 Ws

(b) 230V/40A, R1=0 and R0=0

The table of Rated Condition Select shows that in this case the frequency for the

LED output at rated conditions in 2.55Hz

Hence,

1 pulse =

VI

=

fp

230 x 40

2.55

˜

3600 Ws

As the examples shows, the SA9602M can be configured easily for use in meters

for different rated systems. The only changes which must be implemented are:

selection of current sense resistors for the expected rated load current; and

selection of settings for R0 and R1.

10/16

sames

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