AS8267 datasheet(28/136 Pages) AMSCO

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Data Sheet AS8267 / AS8268

Revision 1.0, 19-Jun-07

Page 28 of 136

The second pulse generator (LED Pulse Gen) produces the LED output pulses (meter constant) from the fast

internal pulses. This type of data interface ensures that the MCU receives exactly the same energy information

as is displayed by the LED pulses.

In case of ‘creep’, the power samples to be added will be set to 0.

The following flow chart shows the basic flow diagram for pulse generation:

Wait for next

power samples

Add power

sample to accu

Generate pulse

Accu>

threshold

defined by

pulse_lev?

The Fast Pulse Gen output pulse rate always has the same relationship with the LED pulse rate defined by

mconst. Only if LED is calibrated to a meter constant different from those provided in the mconst table, will the

fast internal pulse rate be different.

Formula for fast internal pulse rate (PRint):

[]

kWh

mconst

Rate

Pulse

arg

800

204

where mconst is the meter constant.

[]

600

000

int

when 1i is one impulse representing an energy equivalent.

e.g.

TargetPulseRate = mconst = 3200i/kWh

PRint = 204,800 × 1 [i/kWh]

[]

800

204

600

000

Active Power Calibration (Pulse_lev)

This paragraph describes how the active power measurement within the AS8267 / AS8268 ICs is calibrated.

The parameter Pulse_lev is the main parameter which determines the output frequency of the Fast Pulse Gen.

This frequency relates to the measured power and is the basis from which the output pulse rate is derived.

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