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參數(shù)資料
| 型號： | SA9122E |
| 廠商： | SAMES |
| 元件分類： | 電能質(zhì)量分析儀 |
| 英文描述： | SINGLE PHASE UNIDIRECTIONAL POWER/ENERGY METERING IC WITH SEPERATE 64 SEGMENT LCD DRIVER |
| 中文描述： | 單向單相功率/電能計量有獨立的集成電路64段LCD驅(qū)動 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 199K |
| 代理商： | SA9122E |
SA9122E
8/12
sames
4.
Electrostatic Discharge (ESD) Protection
The SA9122E integrated circuit's inputs/outputs are protected against ESD according
to Mil-Std 883C, method 3015.
Power Consumption
The power consumption rating of the SA9122E integrated circuit is less than 25mW.
5.
TYPICAL APPLICATIONS
In the Application Circuit (Figure 1), the components required for this power metering
application, are shown.
In Figure 1 a shunt resistor is used for current sensing. In this application, the circuitry
requires a +2.5V, 0V, -2.5V DC supply.
The most important external components for the SA9122E integrated circuit are:
C
and C
are the outer loop capacitors for the two integrated oversampling A/D
converters. The value of these capacitors is 560pF.
The actual values determine the signal to noise and stability performance. The tolerances
should be within ±10%.
C
and C
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 RSH are the resistors defining the current level into the current sense input.
The values should be selected for an input current of 16μA
RMS
into the SA9122E at
maximum line current.
Values for RSH of less than 200μ
should be avoided.
R
1
= R
2
= (I
L
/16μA
RMS
) * R
SH
/2
Where
I
=
Line current
RSH
=
Shunt resistor/termination resistor
R
, R
and R
set the current for the voltage sense input. The values should be selected
so that the input current into the voltage sense input (virtual ground) is set to 14μA
RMS
.
R
defines the reference current (I
). With R
= 24k
, optimum conditions are set. R
7
may be varied within ±10% for calibration purposes. Any change to R
7
will affect the
output quadratically (i.e.: R
7
= +5%, f
P
= +10%).
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