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CS5461_0408 Fiches technique(PDF) 5 Page - Cirrus Logic |
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CS5461_0408 Fiches technique(HTML) 5 Page - Cirrus Logic |
5 / 45 page CS5461 DS546F2 5 1. GENERAL DESCRIPTION The CS5461 is a CMOS monolithic power measurement device with a real power/energy computation en- gine. The CS5461 combines two programmable gain amplifiers, two ∆Σ modulators, two high-rate filters, system calibration, and calculation functions. The device provides instantaneous voltage and current data samples and calculates average (real) power, VRMS, IRMS, and instantaneous power data samples. The CS5461 functionality is optimized for power measurement applications and is optimized to interface to a shunt or current transformer for current measurement, and to a resistive divider or potential transform- er for voltage measurement. To accommodate various input voltage levels from a multitude of current sen- sors, the CS5461’s current channel has a front-end-programmable gain amplifier (PGA), which allows for two available full-scale differential input signal ranges on the current channel: 100 mVP-P and 500 mVP-P, while the voltage channel has a set input range of 500 mVP-P. With single +5 V (common-mode) supply across VA+/VA-, both of the CS5461’s input channels can accommodate (common-mode + signal) levels between -0.25 V and VA+. This allows for a completely bipolar differential input configuration. The com- mon-mode voltage level of the differential input signals can be anywhere between the supply voltage levels on the VA+/VA- pins, as long as enough voltage margin is left over so that the addition of the differential signals will not cause the total swing to go below -0.25 V or above +5 V. The CS5461 includes two high-rate digital filters, which decimate the output from the two ∆Σ modulators. These filters integrate the output of the ∆Σ modulators for both channels to yield instantaneous voltage and current waveform output data at a (MCLK/K)/1024 output word rate (OWR). To facilitate communication to a microcontroller, the CS5461 includes a simple three-wire serial interface which is SPI™ and Microwire™ compatible. |
Numéro de pièce similaire - CS5461_0408 |
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Description similaire - CS5461_0408 |
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