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SA9103C

SINGLE PHASE BIDIRECTIONAL POWER/ENERGY METERING IC WITH SERIAL INTERFACE

South African Micro Electronic Systems 

SA9103C

The register access codes which can be written to the SA9103C via the serial

communications port are shown in the table below.

REGISTER

ACTIVE

RE-ACTIVE

VOLTAGE

FREQUENCY

READ

$01

$81

$C1

$41

RESET

$02

$82

$C2

-

READ-RESET

$03

$83

$C3

-

Data on SOUT

8 9 10 11 12 13 14 15

01234567

FIRST BYTE

DR-00835

SECOND BYTE

From the two bytes of data output by the device, the value for the register can

be derived as shown:

Register value = (First Byte * 256) + Second Byte

The most significant bit of the 16 bit energy register (active or reactive) is an

indication of the direction of the energy flow (0 = positive, 1 = negative).

6. Register Values

a. The active and reactive energy measured per count, may be calculated by

applying the following formula:

Energy per Count

=

V*I

K

Watt seconds

Where V = Rated Voltage

I

= Rated Current

K = 9281 for Active Energy

9281

π

*

2

for Reactive Energy

b.

c.

8/16

The mains frequency may be calculated as follows:

Frequency =

Crystal frequency

Register Value * 8

To calculate the measured voltage, the following formula may be used:

Vmeasured =

V*n

14000 * t

Where

V=

t=

n=

sames

rated voltage

time difference between successive reads

difference in register values between

successive reads

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