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CDB5461 Fiches technique(PDF) 4 Page - Cirrus Logic |
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CDB5461 Fiches technique(HTML) 4 Page - Cirrus Logic |
4 / 27 page CDB5461 4 1. HARDWARE 1.1 Introduction The CDB5461 evaluation board provides a quick means of evaluating the CS5461 Power Meter IC. The CDB5461 evaluation board’s analog section operates from a single +5V power supply. The evaluation board interfaces the CS5461 to an IBM® compatible PC via an RS-232 interface. Additional analysis software provides easy access to the internal registers of the CS5461, and provides a means to mea- sure and display the performance in the time and frequency domains. 1.2 Evaluation Board Overview The board is partitioned into two main sec- tions: analog and digital. The analog section consists of the CS5461 and a precision volt- age reference. The digital section consists of the 8051 microcontroller, 32 Kilobytes of SRAM, the hardware test switches, the reset circuitry, and the RS-232 interface. The board also has a user friendly power supply connec- tion. 1.2.1 Analog Section The CS5461 is designed to accurately mea- sure and calculate: Energy, Instantaneous Power, IRMS, and VRMS while operating from a 4.096 MHz crystal. As shown in Figure 9, there are four BNC connectors (J6, J7, J8, J9) provided for converter input connections. A Shunt Sensor or Current Transformer can be connected to the converter’s current inputs via J9 (IIN+) and J8 (IIN-). A voltage divider can be connected to the converter’s voltage input via J6 (VIN+) and J7 (VIN-). A simple RC net- work filters the sensor’s output to reduce any interference picked up by the input leads. The 3 dB corner of the filter is approximately 50 kHz differential and common mode. The evaluation board provides three voltage reference options: On-chip, On-board, and Ex- ternal, as shown in Figure 9. Table 1 illustrates the options available. With J18’s jumpers in position REFOUT, the CS5461’s on-chip refer- ence provides 2.5V. With J18’s jumpers in po- sition LT1019, the LT1019 provides 2.5V (the LT1019 was chosen for its low drift, typically 5 ppm/°C). If needed R29 can be populated and use to dial-in a specific reference voltage just above or below 2.5V. By setting J18’s jumpers to position REF+, VREFIN will be set to the external voltage at J26’s REF+ and VA- inputs. The CS5461 serial interfaces are SPITM and MicrowireTM compatible. The interface control lines (CS, SDI, SDO, and SCLK) are connect- ed to the 8051 microcontroller via Port 1. To in- terface an external microcontroller, these control lines are also connected to J19 (Head- er 19). However to accomplish this, the evalu- ation board must be modified in one of three ways: 1) cut the interface control traces going to the microcontroller, 2) remove resistors 24, 23, 22, and 21, or 3) remove the microcontrol- ler. Reference Description J18 LT1019 Selects on board LT1019 Reference (5ppm/ °C) REF+ Selects external reference REFOUT Selects the reference supplied by CS5461 Table 1. Reference Selection O O LT1019 O O REF+ O O REFOUT O O LT1019 O O REF+ O O REFOUT O O LT1019 O O REF+ O O REFOUT |
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Description similaire - CDB5461 |
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