SA4104ASAR datasheet(12/18 Pages) SAMES

12 / 18 page

SPEC-1654 (REV. 4)

12/18

29-09-2017

SA4104A / SA4104B

OUTPUT SIGNALS

LED Output (LED)

The LED output pin provides a pulse output with a frequency

proportional to the average active energy consumption

measured when in STANDARD mode or FAST mode. A low

pass filter is applied to the instantaneous energy output

directly

after

multiplication.

This

filtering

allows

all

instantaneous components to be removed resulting in a

constant output frequency at constant energy input, even

over a short period of time. The delay of this filter is about

200ms.

The LED output is primarily used for calibration purposes.

The Rated Condition Select inputs (R0, R1, R2, R3) and the

Fast Mode Select input (FMS) allow different nominal output

frequencies to be selected. The FMS input also allows

selection between STANDARD mode and FAST mode. The

LED output is active low. Figure 9 shows the LED output

waveform.

In FAST mode the LED pulse output is set to a nominal

frequency of 5kHz at an input current of 16µARMS on both the

current and voltage channels.

The nominal output frequency of the LED pin is given by

��_�� = 5000 ×

�� × �� × |cos ��|

162

…(3)

in FAST mode and by

��_�� =

��_��

…(4)

in STANDARD mode where

IVP and IIP are the analog input currents in µARMS on the

voltage and current sense inputs,

 is the phase angle between the current and voltage signals

and

DF_LED is the LED divider selected by R0, R1, R2, R3 and

FMS according to Table 2.

The timing values given below are based on the nominal

frequency value of the internal oscillator.

tL = 1/fLED_FAST in FAST mode (fLED_FAST as per Equation 3)

= 1/fLED_STD in STANDARD mode (fLED_STD as per

Equation 4)

tLP = 91.5ms when tL > 183ms in STANDARD mode

= tL/2 when tL < 183ms in STANDARD mode

= 69μs in FAST mode

Figure 9: LED pulse output waveform

Motor Pulse Output (MON, MOP)

The MON and MOP pins are complimentary outputs with a

frequency

proportional

the

average

active

power

consumption measured. These active high outputs can be

used to either directly drive a stepper motor counter or an

electro-mechanical impulse counter. The Rated Condition

Select inputs (R0, R1, R2, R3) as well as the Fast Mode

Select input (FMS) allow the selection of different output

frequencies corresponding to different meter constants.

Figure 10 indicates the timing of these signals.

The nominal output frequency of each motor output is given

by:

�� =

��_��

…(5)

where

fLED_STD is the output frequency of the LED output in

STANDARD mode as per Equation 4 and

DF_MO is the motor divider selected by R0, R1, R2, R3 and

FMS according to Table 2

When connecting a stepper motor counter between MON and

MOP the output pulse rate is effectively doubled because the

pulses on both MON and MOP contribute to incrementing the

counter.

The timing values given below are based on the nominal

frequency value of the internal oscillator.

= 1/fMOT (fMOT as per Equation 5)

tMP

= 220ms when tM > 440ms

= tM/2 when tM < 440ms

tMS

= tM/2

tMSP = tMS-tMP when tM > 440ms

= 6.7μs when tM < 440ms

Figure 10: Motor pulse output waveform

MSP

MON

MOP

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