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CS5462 датащи(PDF) 11 Page - Cirrus Logic |
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CS5462 датащи(HTML) 11 Page - Cirrus Logic |
11 / 18 page CS5462 11 3.1 Theory of Operation A computational flow diagram for the two data paths is shown in Figure 1. The analog waveforms at the voltage/current channel inputs are subject to the gains of the input PGAs. 3.1.1 Digital Filters The modulators convert the analog input voltages on the I and V channels to a digital bitstream; which is then filtered by the digital filter section. The digi- tal filter is composed of low pass sinc 3 and IIR fil- ters. The IIR filters are used to compensate for the magnitude roll-off of the low pass filter section. Both channels provide a high-pass filter option which can be engaged into the signal path to re- move the DC content from the current/voltage signal before the energy calculations are made. 3.1.2 Gain Calibration After being filtered, the instantaneous voltage and current digital codes are used to calculate real av- erage power. This power is then adjusted based on the internal calibration setting defined at startup. Calibrating the CS5462 is done by externally con- necting the configuration input pins, CAL1 and CAL0, to the program select output pins, P1 - P7, in a particular sequence. These connections will in- ternally compensate for small gain errors. 3.1.3 Energy-to-Frequency Conversion The calibrated energy value is then converted into a pulse output stream with a average frequency proportional to the measured energy. Pulse output pins E1 and E2 can be set to lower frequencies to directly drive a stepper motor or a mechanical counter or interface a microcontroller or infrared LED. The FOUT pulse output pin is set to max fre- quency of 10 kHz. With full scale inputs on both the current and voltage channels FOUT will output pulses with an average frequency of 10 kHz. x VIN± IIN± PGA Gain Select HPF Select Freq Select Energy to Pulse Rate Converter E1 E2 FOUT Calibration Digital Filters Digital Filters 4th Order ∆Σ Modulator 2nd Order ∆Σ Modulator PGA 10x x On-Chip Configuration Output Mode Select HPF HPF Figure 1. Data Flow |
Аналогичный номер детали - CS5462 |
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Аналогичное описание - CS5462 |
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