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SA9109B Datasheet(PDF) 6 Page - Sames |
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SA9109B Datasheet(HTML) 6 Page - Sames |
6 / 18 page SA9109B 6/18 sames FUNCTIONAL DESCRIPTION The SA9109B is a CMOS mixed signal Analog/Digital integrated circuit, which performs power calculations across a power range of 1000:1, to an overall accurancy of better than Class 1. An on-chip LCD driver directly drives a 7 digit (7 segment) LCD display. Also included on-chip, are 4 tariff registers externally selectable for multi-tariff energy metering applications and a fifth register which retains the total energy consumption. The integrated circuit includes all the required functions such as two oversampling A/D converters for the voltage and current sense inputs, power calculation and energy integration. Offset is eliminated through the use of internal cancellation procedures. 1. Power Calculation In the Application Circuit (Figure 1), the voltage drop across the shunt will be between 0 and 16mV RMS (0 to 80A through a shunt resistor of 200µΩ). This voltage is converted to a current of between 0 and 16µA RMS, by means of resistors R1 and R 2. The current sense input saturates at an input current of ±25µA peak. The voltage level from the mains is divided down through a divider to 14V.This voltage is converted to a signal current of 14µA RMS into the voltage sensor input. A pulse rate output for calibration purposes is available on SDO (Pin 39), the pulse rate being proportional to the active energy consumption. The integrated anti-creep function ensures no metering when no line current is present. 2. Analog Input Configuration The input circuitry of the current and voltage sensor inputs are illustrated below. These inputs are protected against electrostatic discharge through clamping diodes. The feedback loops from the outputs of the amplifiers A I and AV generate virtual shorts on the signal inputs. Exact duplications of the input currents are generated for the analog signal processing circuitry. |
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