 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
CS5467 Datasheet(PDF) 14 Page - Cirrus Logic |
|
|
|||||||||||||||||||||||||||||
CS5467 Datasheet(HTML) 14 Page - Cirrus Logic |
|
|
14 / 46 page  CS5467 14 DS714A1 ADVANCE RELEASE 4. THEORY OF OPERATION The CS5467 is a four-channel analog-to-digital convert- er (ADC) followed by a computation engine that per- forms power calculations and energy-to-pulse conversion. The data flow for the voltage and current channel measurement and the power calculation algo- rithms are depicted in Figures 3, 4, and 5. The CS5467 analog inputs are structured with two Cur- rent channels and two Voltage channels, and are opti- mized to simplify interfacing to various sensing elements. As shown in Figures 3 and 4, the current and voltage channels are fully independent. The voltage-sensing elements introduces a voltage waveform on the two voltage channel inputs VIN ± and VIN2 ±, which is subject to a gain of 10x. A second-order delta-sigma modulator samples the amplified signal for digitization. Simultaneously, the current-sensing elements introduce a voltage waveform on the two current channel inputs IIN ± and IIN2±, which is subject to the two selectable gains of the programmable gain amplifier (PGA). The amplified signals are sampled by a fourth-order delta-sigma modulator for digitization. The converters sample at a rate of MCLK/8. The over-sampling pro- vides a wide dynamic range and simplified anti-alias fil- ter design. 4.1 Digital Filters The decimating digital filters on the four channels are Sinc3 filters followed by 3rd-order IIR filters. The sin- gle-bit data is passed to the low-pass decimation filter and output at a fixed word rate. The output word is passed to an IIR filter to compensate for the magnitude roll off of the low-pass filtering operation. An optional digital high-pass filter (HPF in Figures 3 and 4) removes any DC component from the selected signal path. By removing the DC component from the voltage and/or the current channel, any DC content will also be removed from the calculated active power as well. With both HPFs enabled the DC component will be removed VOLTAGE SINC3 + X Vgn CURRENT SINC3 + X I gn DELAY REG I DCoff V DCoff PGA + + Σ Σ Control Register Digital Filter Digital Filter HPF 2nd Order ∆Σ Modulator 4th Order ∆Σ Modulator x10 X X 7 DELAY REG HPF VQ 0 1 2 2322 ... X X X Q 2 π X V P I VHPF IHPF 65 ε APF HPF APF IIR 3 ... Operational Modes Register IIR SYS Gain SYS Gain PC[6] PC[5] PC[4] PC[3] PC[2] PC[1] PC[0] PC[7] REGISTER NAMES INDICATED IN SHADED AREAS. IIR Figure 3. Data Measurement Flow Diagram 2nd Order ∆Σ Modulator Control Register + X V2gn + X I2gn I2 dcoff V2 dcoff PGA + + Σ Σ HPF 4th Order ∆Σ Modulator HPF V2Q 0 1 2 2322 ... X X X Q2 π X V2 P2 I2 VHPF IHPF 87 ε APF HPF APF 3 CURRENT 2 ... Operational Modes Register SINC3 SINC3 DELAY REG Digital Filter Digital Filter X X 7 DELAY REG IIR IIR SYS Gain SYS Gain IIR PC[6] PC[5] PC[4] PC[3] PC[2] PC[1] PC[0] PC[7] REGISTER NAMES INDICATED IN SHADED AREAS. X10 VOLTAGE 2 Figure 4. Data Measurement Flow Diagram |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
