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78M6613 Datasheet(PDF) 5 Page - Teridian Semiconductor Corporation |
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78M6613 Datasheet(HTML) 5 Page - Teridian Semiconductor Corporation |
5 / 33 page DS_6613_018 78M6613 Data Sheet Rev. 1.1 5 1 Hardware Description 1.1 Hardware Overview The Teridian 78M6613 single-chip measurement unit integrates all primary functional blocks required to embed solid-state AC power and energy measurement. Included on chip are: • An analog front end (AFE) • An independent digital computation engine (CE) • An 8051-compatible microprocessor (MPU) which executes one instruction per clock cycle (80515) • A voltage reference • A temperature sensor • RAM and Flash memory • A variety of I/O pins Current sensor technologies supported include Current Transformers (CT) and Resistive Shunts. In a typical application, the 32-bit compute engine (CE) of the 78M6613 sequentially processes the samples from the voltage inputs on pins A0, A1, A2, A3 and performs calculations to measure active energy (Wh), reactive energy (VARh), A2h, and V2h for four-quadrant measurement. These measurements are then accessed by the MPU, processed further and output using the peripheral interfaces available to the MPU. In addition to the temperature-trimmed ultra-precision voltage reference, the on-chip digital temperature compensation mechanism includes a temperature sensor and associated controls for correction of unwanted temperature effects on measurement. Temperature dependent external components such as crystal oscillator, current transformers (CTs), and their corresponding signal conditioning circuits can be characterized and their correction factors can be programmed to produce measurements with exceptional accuracy over the industrial temperature range, if desired. A block diagram of the IC is shown in Figure 1. A detailed description of various functional blocks follows. |
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