Cirrus-logic CS5467 Manual de usuario

Copyright  Cirrus Logic, Inc. 2011(All Rights Reserved)http://www.cirrus.comCS5467Four-channel Power/Energy ICFeatures & Description• Energy Line

CS546710 DS714F3DIGITAL CHARACTERISTICS• Min / Max characteristics and specifications are guaranteed over all Recommended Operating Conditions.• Typi

CS5467DS714F3 11SWITCHING CHARACTERISTICS• Min / Max characteristics and specifications are guaranteed over all Recommended Operating Conditions.• Ty

CS546712 DS714F3t1t2t3t4t5MSBMSB-1LSBMSBMSB-1LSBMSBMSB-1LSBMSBMSB-1LSBCommand Time 8 SCLKs High Byte Mid Byte Low ByteCSSCLKSDIt10t9RESETSDOSCLKCSLast

CS5467DS714F3 13SWITCHING CHARACTERISTICS (Continued)Notes: 19. Pulse output timing is specified at DCLK = 4.096 MHz, E2MODE = 0, and E3MODE[1:0] = 0.

CS546714 DS714F34. SIGNAL PATH DESCRIPTION The data flow for voltage and current measurement andthe other calculations are shown in Figures 3, 4, an

CS5467DS714F3 154.4 DC Offset and Gain CorrectionThe system and chip inherently have gain and offset er-rors which can be removed using the gain and

CS546716 DS714F34.8 Power and Energy ResultsThe instantaneous voltage and current samples aremultiplied to obtain the instantaneous power (P1, P2)(se

CS5467DS714F3 174.9 Peak Voltage and CurrentPeak current (I1PEAK, I2PEAK) and peak voltage(V1PEAK, V2PEAK) are the largest current and voltagesample

CS546718 DS714F35. PIN DESCRIPTIONS5.1 Analog PinsThe CS5467 has four differential inputs: VIN1VIN2IIN1, and IIN2 are the voltage1, voltage2,

CS5467DS714F3 195.2.5 Serial InterfaceThe CS5467 provides 5 pins, SCLK, SDI, SDO, CS, andMODE for communication between a host microcon-troller or se

CS54672 DS714F3TABLE OF CONTENTS1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CS546720 DS714F36. SETTING UP THE CS54676.1 Clock DividerThe internal clock to the CS5467 needs to operatearound 4 MHz. However, by using the interna

CS5467DS714F3 21E3MODE[1:0] in the Modes register when E1MODE isnot enabled.When both E2MODE bits are high, the E1MODE bitsare enabled, allowing activ

CS546722 DS714F3For each enabled input channel, the measured value isrectified and compared to the associated level register.Over the duration window,

CS5467DS714F3 237. USING THE CS54677.1 InitializationThe CS5467 uses a power-on-reset circuit (POR) toprovide an internal reset until the analog volt

CS546724 DS714F37.4 Command InterfaceCommands and data are transferred most-significant bit(MSB) first. Figure 1 on page 12, defines the serial portt

CS5467DS714F3 257.6 CommandsAll commands are 1 byte (8 bits) long. Many command values are unused and should NOT be written by the application progr

CS546726 DS714F37.6.4 Calibration The CS5467 can perform gain and offset calibrations using either DC or AC signals. Proper input levels must be appl

CS5467DS714F3 277.6.5 Register Read and Write Read and Write commands provide access to on-chip registers. After a Read command, the addressed data c

CS546728 DS714F3Page1 RegistersAddressRA[4:0] Name Description0 00000 I1OFFCurrent DC Offset Channel 11 00001 I1GAINCurrent Gain Channel 12 00010 V1OF

CS5467DS714F3 298. REGISTER DESCRIPTIONS1. “Default” = bit states after power-on or reset2. DO NOT write a “1” to any unpublished register bit.3. DO N

CS5467DS714F3 35.1.4 Voltage Reference Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185.1.5 Voltage Reference Output .

CS546730 DS714F38.2.2 Instantaneous Current (I1, I2), Voltage (V1, V2), and Power (P1, P2)Address: 1 (I1), 2 (V1), 3 (P2), 7 (I2), 8 (V2), 9 (P2)I1 (

CS5467DS714F3 318.2.7 Peak Current (I1PEAK, I2PEAK ) and Peak Voltage (V1PEAK, V2PEAK )Address: 18 (I1PEAK), 19 (V1PEAK), 22 (I2PEAK), 23 (V2PEAK) Pe

CS546732 DS714F38.2.12 Internal Status (Status) and Interrupt Mask (Mask)Address: 15 (Status); 26 (Mask)Default = 1 (Status), 0 (Mask)The Status reg

CS5467DS714F3 338.2.13 Control (Ctrl) – Address: 28 Default = 0PC[7:0] Phase compensation for channel 2. Sets a delay in voltage relative to current.

CS546734 DS714F38.3 Page 1 Registers8.3.1 DC Offset for Current (I1OFF , I2OFF ) and Voltage (V1OFF , V2OFF )Address: 0 (I1OFF ), 2 (V1OFF ), 7 (I2O

CS5467DS714F3 358.3.5 Mode Control (Modes) – Address: 16 Default = 0VFIX Use internal RMS voltage reference instead of voltage input for average acti

CS546736 DS714F38.3.6 Line to Sample Frequency Ratio (Epsilon) – Address: 17 Default = 0.0125 (4.0 kHz x 0.0125 or 50 Hz)Epsilon is the ratio of the

CS5467DS714F3 378.3.11 Temperature Gain (TGAIN ) – Address: 22 Default = 0x2F02C3Refer to 6.13 Temperature Measurement on page 22 for more informatio

CS546738 DS714F38.3.16 System Gain (G) – Address: 28 Default = 1.25System Gain (G) is applied to all channels. By default, G = 1.25, but can be finel

CS5467DS714F3 398.4 Page 2 Registers8.4.1 Voltage Sag and Current Fault Duration (V1SagDUR , V2SagDUR , I1FaultDUR , I2FaultDUR )Address: 0 (V1SagDU

CS54674 DS714F39.1.3 Calibration Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 419.1.4 Temperature Sensor Cali

CS546740 DS714F39. SYSTEM CALIBRATION9.1 Calibration The CS5467 provides DC offset and gain calibrationthat can be applied to the voltage and current

CS5467DS714F3 419.1.2 Gain CalibrationDuring gain calibration, a full-scale reference signalmust be applied to the meter or optionally, scaled to the

CS546742 DS714F310. E2PROM OPERATIONThe CS5467 can accept commands from a serialE2PROM connected to the serial interface instead of ahost microcontrol

CS5467DS714F3 4311. BASIC APPLICATION CIRCUITSFigure 14 shows the CS5467 configured to measurepower in a single-phase, 3-wire system while operatingin

CS546744 DS714F312. PACKAGE DIMENSIONSNotes: 1. “D” and “E1” are reference datums and do not included mold flash or protrusions, but do include mold

CS5467DS714F3 4513. ORDERING INFORMATION 14. ENVIRONMENTAL, MANUFACTURING, & HANDLING INFORMATION* MSL (Moisture Sensitivity Level) as specified

CS546746 DS714F315. REVISION HISTORY Revision Date ChangesPP1 FEB 2007 Initial release.PP2 FEB 2007Corrections to implicitly state that temperature me

CS5467DS714F3 51. OVERVIEWThe CS5467 is a CMOS power measurement integrated circuit utilizing four  analog-to-digital convert-ers to measure two lin

CS54676 DS714F32. PIN DESCRIPTIONClock GeneratorCrystal OutCrystal In1,28XOUT, XIN — Connect to an external quartz crystal. Alternatively, an externa

CS5467DS714F3 73. CHARACTERISTICS & SPECIFICATIONSRECOMMENDED OPERATING CONDITIONSANALOG CHARACTERISTICS• Min / Max characteristics and specificat

CS54678 DS714F3ANALOG CHARACTERISTICS (Continued)Notes: 3. Applies before system calibration.4. All outputs unloaded. All inputs CMOS level.5. Measure

CS5467DS714F3 9VOLTAGE REFERENCENotes: 8. The voltage at VREFOUT is measured across the temperature range. From these measurements the following formu