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78M6631 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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78M6631 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 30 page 78M6631 Data Sheet DS_6631_056 8 Rev 1 1.4 Analog Front-End (AFE) The AFE functions as a data acquisition system, controlled by the MPU. The main blocks in the AFE consist of an input multiplexer, a delta-sigma A/D converter, a FIR decimation filter and a voltage reference. The metrology input signals (IAP, IAN, IBP, IBN, ICP, ICN, VA, VB, VC, and TEMP) are multiplexed before being sampled by the ADC. The ADC output is decimated by the FIR filter and the results are stored in RAM where they can be accessed by the CE and the MPU. The functionality of the AFE is established for various system requirements with different CE code. AFE programmability includes, but is not limited to: • Input multiplexer settings • Voltage supply and temperature monitor inputs • ADC sampling rate • FIR length/resolution VA VB MUX VREF 4.9152 MHz VBIAS CROSS CK32 VREF MUX CTRL VC MUX V3P3A FIR VBIAS ∆Σ ADC CONVERTER + - VREF TEMP V3P3D FIR_DONE FIR_START IBP IBN ICP ICN IAP IAN - + - + - + Figure 2: AFE Block Diagram 1.4.1 Analog Current and Voltage Inputs With all CE code implementations for the 78M6631, pins IAP, IAN, IBP, IBN, ICP, ICN, VA, VB, and VC are analog inputs to the AFE for measuring current and voltage. Various current sensor technologies can be supported including Current Transformers, Resistive Shunts, and Rogowski coils. |
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