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PDF PM9106AP Data sheet ( Hoja de datos )
| Número de pieza | PM9106AP | |
| Descripción | SINGLE PHASE WATT MEASUREMENT MODULE | |
| Fabricantes | Sames | |
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sames
SA9106 APPLICATION NOTE
PM9106AP
SINGLE PHASE WATT MEASUREMENT MODULE
WITH A 5 DIGIT LED DISPLAY
FEATURES
n Performs power measurement and di- n Uses a shunt resistor or for current
rectly drives a 5 digit (7 segment) LED
sensing
display
n Operates over a wide temperature
n Accuracy better than 1% (± 1 count)
range
n Protected against ESD
n Precision voltage reference on-chip
n Total power consumption rating below
800mW
DESCRIPTION
The SAMES single phase Watt measurement module, the PM9106AP includes an on-
board 5 digit (7 segment) Light Emitting Diode (LED) display. Active power is directly
displayed in watts, with a full scale of 20 000 watts.
The measured power is updated approximately every 2 seconds, giving an average
power reading for this period.
This method of calculation takes the power factor into account.
This innovative universal Watt measurement module is ideally suited for the display of
the measured power in single phase, industrial and domestic power measurement
applications.
The application utlises the SAMES SA9106AP single phase Watt measurement
integrated circuit for power measurement and display.
As a safety measure, this application shows the current sensor connected to the neutral
line. In practice, the live line may be used for current sensing, provided that the supply
connections (MAINS) are reversed on the module.
4358
PDS038-SA9106-001 REV. A
1/10
06-09-1995
1 page  
PM9106AP
The most important external components for the SA9106AP device are:
C1 and C2 are the outer loop capacitors for the two integrated oversampling A/D
converters. The value of these capacitors is 560pF.
The actual values determine signal to noise and stability performance. The optimum
tolerances should be within ± 10%.
C3 and C4 are the inner loop capacitors of the A/D converters. The optimum value
is 3.3nF. The actual values are uncritical. Values smaller than 0.5nF and larger than
5nF should be avoided.
R , R and R are the resistors defining the current level into the current sense input.
21
SH
The values should be selected for an input current of 16µA into the SA9106AP
RMS
at rated line current.
Values for RSH of less than 200µΩ should be avoided.
R = R = (I /16µA ) * R /2
1 2L
RMS
SH
Where
IL = Line current
RSH = Shunt resistor/termination resistor
R , R and R set the current for the voltage sense input. The values should be
35
4
selected so that the input current into the voltage sense input (virtual ground) is set
to 14µA.
R7 defines all on-chip bias and reference currents. With R7 = 24kΩ, optimum
conditions are set.
XTAL is a colour burst TV crystal (f = 3.5795MHz) for the oscillator. The oscillator
frequency is divided down to 1.7897MHz on-chip and supplies the A/D converters
and the digital circuitry.
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet PM9106AP.PDF ] | |
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