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71M6534 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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71M6534 Datasheet(HTML) 9 Page - Maxim Integrated Products |
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9 / 132 page  FDS_6533_6534_004 71M6533/G/H and 71M6534/H Data Sheet Rev 2 9 1 Hardware Description 1.1 Hardware Overview The Teridian 71M6533 and 71M6534 single-chip energy meter integrate all primary functional blocks required to implement a solid-state electricity meter. Included on the 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 • LCD drivers • RAM and Flash memory • A real time clock (RTC) • A variety of I/O pins Various current sensor technologies are supported including Current Transformers (CT), Resistive Shunts and Rogowski coils. In a typical application, the 32-bit compute engine (CE) of the 71M6533/71M6534 sequentially processes the samples from the voltage inputs on analog input pins and performs calculations to measure active energy (Wh) and reactive energy (VARh), as well as A2h, and V2h for four-quadrant metering. These measurements are then accessed by the MPU, processed further and output using the peripheral devices available to the MPU. In addition to advanced measurement functions, the real time clock function allows the 71M6533/71M6534 to record time of use (TOU) metering information for multi-rate applications and to time-stamp tamper events. Measurements can be displayed on 3.3 V LCDs commonly used in low-temperature environments. Flexible mapping of LCD display segments facilitate integration of existing custom LCDs. Design trade-offs between the number of LCD segments and DIO pins can be implemented in software to accommodate various requirements. 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 and RTC accuracy, e.g. to meet the requirements of ANSI and IEC standards. Temperature dependent external components such as a crystal oscillator, current transformers (CTs) and their corresponding signal conditioning circuits can be characterized and their correction factors can be programmed to produce electricity meters with exceptional accuracy over the industrial temperature range. One of the two internal UARTs is adapted to support an Infrared LED with internal drive and sense configuration and can also function as a standard UART. The optical output can be modulated at 38 kHz. This flexibility makes it possible to implement AMR meters with an IR interface. A block diagram of the IC is shown in Figure 1. 1.2 Analog Front End (AFE) The AFE of the 71M6533/71M6534 consists of an input multiplexer, a delta-sigma A/D converter and a voltage reference. 1.2.1 Signal Input Pins All analog signal input pins are sensitive to voltage. The VA, VB, and VC pins are single-ended. Pins IAP/IAN, IBP/IBN, ICP/ICN, and IDP/IDN can be programmed individually to be differential or single-ended. The differential signal is applied between the InP and InN input pins. Single-ended signals are applied to the InP input while the common signal, return, is the V3P3A pin. When using the differential mode, inputs can be chopped, i.e., a connection from V3P3A to InP or InN alternates in each multiplexer cycle. |
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