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AS8168

Single Phase Average Energy Metering IC with On-Chip Calibration, Stepper Motor Drive and LED Output

austriamicrosystems AG 

Data Sheet AS8168

The default pulse rate of CAL is MON/MOP x 16. The default pulse rate is the pulse rate available at the output, without any

programming required to the AS8168.

(Note: As the default pulse rate of MON/MOP is 400 imp/kWh, the actual CAL default pulse rate is 400 x 16 =

6,400 imp/kWh)

As an example, the maximum selectable pulse rate of CAL is 64 * 800 = 51,200 imp/kWh (See MON/MOP below)

The CAL pulse width is fixed at 1ms and is shown in the Timing Diagram and Timing Parameters that follow.

Stepper Motor Drive Outputs (MON & MOP): The MON and MOP outputs may be used to directly drive an electromechanical

counter or a stepper motor counter. The output frequencies are proportional to the real power measured. The required format

of the signal for driving a mechanical counter, activated by a 2-phase stepper motor is provided by the difference between

the MON and MOP outputs.

The output pulse rate is programmable via the on-chip memory, with 4 pulse rate options being available:

Parameter: F_mon_sel

Setting MON/MOP Output Pulse Rate

00

100 imp/kWh

01

200 imp/kWh

10

400 imp/kWh

11

800 imp/kWh

The default MON/MOP pulse rate is set at 400 imp/kWh. The default pulse rate is the pulse rate available at the output,

without any programming required to the AS8168.

The MON and MOP outputs shown in Figure 4 are capable of driving 10mA at VOH = 4.0V and VOL = 0.4V.

The widths of the MON/MOP pulses are 200ms for all settings up to 800 imp/kWh. Above 800imp/kWh, the MON/MOP pulse

widths maintain a constant 50% duty cycle and is shown in the Timing Diagram and Timing Parameters that follows.

LED Driver Pulse Output (LED): The LED output is a low frequency output, the frequency of which is proportional to the real

power measured. The pulse rate is programmable via the on-chip memory the selected pulse rate is independent of the

settings of both the selected CAL and the MON/MOP settings.

Parameter: F_led_sel

Setting LED Output Pulse Rate

000 100 imp/kWh

001 200 imp/kWh

010 400 imp/kWh

011 800 imp/kWh

100 1600 imp/kWh

101 3200 imp/kWh

110 6400 imp/kWh

The default LED pulse rate is set at 3200 imp/kWh. The default frequency is the frequency available at the output, without

any programming required to the AS8168.

The LED output is capable of driving 10mA at VOH = 4.0V and VOL = 0.4V.

The width of the LED pulse is 80 ms for all settings except where the LED stream is shorter than 160ms. In this case, a 50%

duty cycle is maintained. The format of the LED signal is shown in the Timing Diagram and Timing Parameters below.

Revision 1.2, 11-Feb-05

Page 8 of 30

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