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SA9106A 数据表(PDF) 5 Page - Sames

部件名 SA9106A
功能描述  SINGLE PHASE WATT MEASUREMENT IC WITH INTEGRATED 5 DIGIT LED DISPLAY DRIVER
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制造商  SAMES [Sames]
网页  http://www.sames.co.za
标志 SAMES - Sames

SA9106A 数据表(HTML) 5 Page - Sames

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SA9106A
sames
5/14
Pin
Pin
Designation
Description
PLCC
DIP
31
39
TP39
Manufacturer's Test Pins (Leave unconnected)
32
40
TP40
1
TP1
4
TP4
5
TP5
9
TP9
12
TP12
37
TP37
38
TP38
44
TP44
PIN DESCRIPTION (Continued)
FUNCTIONAL DESCRIPTION
The SA9106A is a CMOS mixed signal Analog/Digital integrated circuit, which performs
bidirectional power calculations across a power range of 1000:1, to an overall accurancy
of better than 1% (± 1 count). An on-chip LED display driver directly drives a 5 digit (7
segment) LED display. The measured power is displayed in Watts.
The integrated circuit comprises of all the required functions such as two oversampling
A/D converters for the voltage and current sense inputs, power calculation and energy
integration. Internal offsets are eliminated through the use of cancellation procedures.
1.
Power Calculation
In the Application Circuit (Figure 1), the voltage drop across the shunt will be
between 0 and 50mV (0 to 80A through a shunt resistor of 625µ
Ω). This voltage is
converted to a current of between 0 and 16µA, by means of resistors R
1 and R2.
The current sense input saturates at an input current of ±25µA peak.
For the voltage sense input, the mains voltage (230VAC) is divided down through
a divider to 14V. The resulting current into the A/D converter input is set at 14µA
at nominal mains voltage, via resistor R4 (1M
Ω).
In this configuration, with a mains voltage of 230 V and a current of 80A, the
displayed power is 18 400 Watts.
2.
LED Display Driver
The SA9106A has an on-chip LED display driver capable of driving 5 digit (7
segment) common cathode digits as well as a sign LED.
The sign LED is addressed by DIG [5], the most significant digit by DIG [4] and the
least significant digit by DIG [0].
The position of the segments a, b, c, d, e, f and g are shown in the diagram below:


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