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AS8118 Datasheet(PDF) 8 Page - ams AG |
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AS8118 Datasheet(HTML) 8 Page - ams AG |
8 / 30 page Data Sheet AS8118 Revision 1.8, 15-Feb-05 Page 8 of 30 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 AS8118. (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 AS8118. 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 800imp/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 AS8118. 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. |
Similar Part No. - AS8118_1 |
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