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SA9106A 数据表(PDF) 5 Page - Sames |
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SA9106A 数据表(HTML) 5 Page - Sames |
5 / 14 page 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: |
类似零件编号 - SA9106A |
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类似说明 - SA9106A |
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