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71M6513/71M6513H
A Maxim Integrated Products Brand
3 -Phase      Energy Meter IC
DATA SHEET
AUGUST 2011
Pulse Generation
Input variables: The combination of the PULSE_SLOW and PULSE_FAST parameters control the speed of the pulse rate. The
default values of 1 and 1 will maintain the original pulse rate given by the Kh equation.
WRATE controls the number of pulses that are generated per measured Wh and VARh quantities. The lower WRATE it is the
slower is the pulse rate for measured power quantity. The metering constant Kh is derived from WRATE as the amount of
energy measured for each pulse. That is, if Kh = 1Wh/pulse, a power applied to the meter of 120V and 30A results in one
pulse per second. If the load is 240V at 150A, ten pulses per second will be generated.
Control is transferred to the MPU for pulse generation if EXT_PULSE > 0. In this case, the pulse rate is determined by
APULSEW and APULSER . The MPU has to load the source for pulse generation in APULSEW and APULSER to generate pulses.
Irrespective of the EXT_PULSE , status the output pulse rate controlled by APULSEW and APULSER is implemented by the CE
only. By setting EXT_PULSE > 0, the MPU is providing the source for pulse generation. If EXT_PULSE is negative, W0SUM_X
and VAR0SUM_X are the default pulse generation sources. In this case, creep cannot be controlled since it is an MPU function.
The maximum pulse rate is 3*F S = 7.56kHz.
PULSE_WIDTH allows adjustment of the pulse width for compatibility with calibration and other external equipment. The
minimum pulse width possible is 66.16μs.
The maximum time jitter is 1/6 of the MUX cycle period (normally 67μs) and is independent of the number of pulses measured.
Thus, if the pulse generator is monitored for 1 second, the peak jitter is 67ppm. After 10 seconds, the peak jitter is 7ppm. The
average jitter is always zero. If it is attempted to drive either pulse generator faster than its maximum rate, it will simply output
at its maximum rate without exhibiting any roll-over characteristics. The actual pulse rate, using WSUM as an example, is:
RATE =
X ? WRATE ? WSUM ? F S
2 46
Hz
Where F S = 2520.6Hz (sampling frequency), and X = pulse speed factor derived from CE variables PULSE_SLOW and
PULSE_FAST (see table below).
Page: 74 of 104
? 2005-2011 Teridian Semiconductor Corporation
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