參數(shù)資料
型號(hào)： DRM042
英文描述： Universal Serial Bus Wireless Optical Mouse and Multimedia Keyboard reference design designer reference manual
中文描述： 通用串行總線無(wú)線光學(xué)鼠標(biāo)和多媒體鍵盤(pán)參考設(shè)計(jì)，設(shè)計(jì)參考手冊(cè)
文件頁(yè)數(shù)： 16/80頁(yè)
文件大?。?/td> 1025K
代理商： DRM042
Introduction
Designer Reference Manual
DRM040 — Rev 0
16
Introduction
MOTOROLA
In software the instantaneous power is calculated by summing up each
product of voltage and current for a total of 256 samples. After 256
samples the result is divided by a scaling coefficient, called the
calibration coefficient. The coefficient is a scaling factor which also takes
into account analog circuit tolerances. Its nominal value is 8114 (see
Appendix B
for an explanation).
The resulting
time interval. This value is added to the active tariff to calculate the
accumulated energy and divided by 22500 to convert to watt-hours.
See software section for detailed implementation.
represents the average energy over a 160 millisecond
1.2.1 ADC Range
In order to comply with the requirements imposed by the IEC 61036
standard, the current ranges must be measured within the defined error:
+-1%
+-1.5%
The 1,5% error in the lowest current range imposes a dynamic range of
which is between 12 and 13Bits. The A/D converter of the LJ12 has only
a 10-bit resolution, but oversampling and averaging the instantaneous
power over 8 cycles of the input signal, increases the effective resolution
of the converter. To cover the additional current range from to
more bits are required. This is accomplished by attenuating the current
signal by a factor of four before application to the A/D converter inputs
as shown in
Figure 1-4
.
two
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F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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