BOARD EVAL FOR CS5467 ADC

CDB5467U

Manufacturer Part NumberCDB5467U
DescriptionBOARD EVAL FOR CS5467 ADC
ManufacturerCirrus Logic Inc
TypeA/D
CDB5467U datasheets
 


Specifications of CDB5467U

Main PurposePower Management, Energy/Power MeterEmbeddedYes, MCU, 8-Bit
Utilized Ic / PartCS5467Primary AttributesWatt-Hour Meter
Secondary AttributesGraphical User Interface, SPI™ & USB InterfacesProductData Conversion Development Tools
Maximum Clock Frequency4 MHzInterface TypeUSB
Supply Voltage (max)5 VSupply Voltage (min)3.3 V
For Use With/related ProductsCS5467Lead Free Status / RoHS StatusContains lead / RoHS non-compliant
Other names598-1555
CDB-5467U
  
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Four-channel Power / Energy IC
Features
& Description
• Energy Linearity: ±0.1% of Reading over 1000:1
Dynamic Range
• On-chip Functions:
- Voltage and Current Measurement
- Active, Reactive, and Apparent Power/Energy
- RMS Voltage and Current Calculations
- Current Fault and Voltage Sag Detection
- Calibration
- Phase Compensation
- Temperature Sensor
- Energy Pulse Outputs
• Meets Accuracy Spec for IEC, ANSI, & JIS
• Low Power Consumption
• Voltage Tamper Correction
• Ground-referenced Inputs with Single Supply
• On-chip 2.5 V Reference (25 ppm / °C typ.)
• Power Supply Monitor Function
• Three-wire Serial Interface to Microcontroller or
2
E
PROM
• Power Supply Configurations
GND: 0 V, VA+: +5 V, VD+: +3.3 V to +5 V
VA+
IIN1+
PGA
IIN1-
VIN1+
x10
VIIN1-
IIN2+
PGA
IIN2-
VIN2+
x10
VIN2-
VREFIN
x1
Voltage
VREFOUT
Reference
AGND
http://www.cirrus.com
Description
The CS5467 is a watt-hour meter on a chip. It
measures line voltage and current and calcu-
lates active, reactive, apparent power, energy,
power factor, and RMS voltage and current.
An internal RMS voltage reference can be used
if
voltage
tampering.
Four ∆Σ analog-to-digital converters are used to
measure two voltages and two currents. Option-
ally, voltage2 channel can be used for
temperature measurement.
The CS5467 is designed to interface to a variety
of voltage and current sensors.
Additional features include system-level calibra-
tion, voltage sag and current fault detection,
peak detection, phase compensation, and ener-
gy pulse outputs.
ORDERING INFORMATION
See
Page
RESET
4th Order ∆Σ
Digital
HPF
Modulator
Filter
Option
2nd Order ∆Σ
Digital
HPF
Modulator
Filter
Option
4th Order ∆Σ
Digital
HPF
Filter
Modulator
Option
2nd Order ∆Σ
Digital
HPF
Modulator
Filter
Option
Temperature
System
Power
/K
Sensor
Clock
Monitor
PFMON
Copyright © Cirrus Logic, Inc. 2007
(All Rights Reserved)
CS5467
measurement
is
disabled
45.
VD+
MODE
CS
SDI
SDO
Serial
SCLK
Interface
Power
INT
Calculation
Engine
E1
E-to-F
E2
E3
Calibration
Clock
Generator
XIN
XOUT CPUCLK
DGND
by
MAR ‘07
DS714F1

CDB5467U Summary of contents

  • Page 1

    Four-channel Power / Energy IC Features & Description • Energy Linearity: ±0.1% of Reading over 1000:1 Dynamic Range • On-chip Functions: - Voltage and Current Measurement - Active, Reactive, and Apparent Power/Energy - RMS Voltage and Current Calculations - Current ...

  • Page 2

    Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

  • Page 3

    Voltage Reference Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5.1.5 ...

  • Page 4

    Calibration Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

  • Page 5

    OVERVIEW The CS5467 is a CMOS power measurement integrated circuit utilizing four ∆Σ analog-to-digital convert- ers to measure two line voltages and two currents. Optionally, voltage2 channel can be used for temper- ature measurement. It calculates active, reactive, and ...

  • Page 6

    PIN DESCRIPTION Crystal Out CPU Clock Output Positive Digital Supply Digital Ground Serial Clock Serial Data Ouput Chip Select Mode Select Differential Voltage Input Differential Voltage Input Voltage Reference Output Voltage Reference Input Differential Voltage Input Differential Voltage Input ...

  • Page 7

    CHARACTERISTICS & SPECIFICATIONS RECOMMENDED OPERATING CONDITIONS Parameter Positive Digital Power Supply Positive Analog Power Supply Voltage Reference Specified Temperature Range ANALOG CHARACTERISTICS • Min / Max characteristics and specifications are guaranteed over all • Typical characteristics and specifications are ...

  • Page 8

    ANALOG CHARACTERISTICS Parameter Analog Inputs (Voltage Inputs) Differential Input Range Total Harmonic Distortion Crosstalk from Current inputs at Full Scale Input Capacitance Effective Input Impedance Noise (Referred to Input) Offset Drift (Without the High-pass Filter) Gain Error Temperature Temperature Accuracy ...

  • Page 9

    VOLTAGE REFERENCE Parameter Reference Output Output Voltage Temperature Coefficient Load Regulation Reference Input Input Voltage Range Input Capacitance Input CVF Current Notes: 8. The voltage at VREFOUT is measured across the temperature range. From these measurements the following formula is ...

  • Page 10

    DIGITAL CHARACTERISTICS • Min / Max characteristics and specifications are guaranteed over all • Typical characteristics and specifications are measured at nominal supply voltages and °C. • VA ±5%; AGND = DGND = ...

  • Page 11

    SWITCHING CHARACTERISTICS • Min / Max characteristics and specifications are guaranteed over all • Typical characteristics and specifications are measured at nominal supply voltages and °C. • VA ±5% VD+ = 3.3 V ±5% ...

  • Page 12

    ...

  • Page 13

    SWITCHING CHARACTERISTICS Parameter E1, E2, and E3 Timing Period Pulse Width Rising Edge to Falling Edge E2 Setup to E1 and/or E3 Falling Edge E1 Falling Edge to E3 Falling Edge Notes: 19. Pulse output timing is specified at DCLK ...

  • Page 14

    FGA 1 Figure 3. Signal Flow for V1, I1, P1, Q1 Measurements 4. SIGNAL PATH DESCRIPTION The data flow for voltage and current measurement and the other calculations are shown in Figures 3, 4, and 5. 4.1 Analog-to-Digital Converters Voltage1 ...

  • Page 15

    DC Offset and Gain Correction The system and chip inherently have gain and offset er- rors which can be removed using the gain and offset registers. (See Section 9. System Calibration 40). Each measurement channel has its own registers. ...

  • Page 16

    P1 (P2 ) OFF OFF 4.8 Power and Energy Results The instantaneous voltage and current samples are multiplied to obtain the instantaneous power ( (see Figure 3 and 4). The product is then averaged over N ...

  • Page 17

    Peak Voltage and Current Peak current ( and peak voltage PEAK PEAK ( are the largest current and voltage PEAK PEAK samples detected in the previous low-rate interval. 4.10 Power Offset ...

  • Page 18

    PIN DESCRIPTIONS 5.1 Analog Pins The CS5467 has four differential inputs: VIN1 ±, VIN2 ±, IIN1 ± , and IIN2 ± are the voltage1, voltage2, current1, and current2 inputs, respectively. A single-ended power fail monitor input, voltage reference input, ...

  • Page 19

    Serial Interface The CS5467 provides 5 pins, SCLK, SDI, SDO, CS, and MODE for communication between a host microcontrol- 2 ler or serial E PROM and the CS5467. MODE is an input that, when high, indicates to the 2 ...

  • Page 20

    SETTING UP THE CS5467 6.1 Clock Divider The internal clock to the CS5467 needs to operate around 4 MHz. However, by using the internal clock di- vider, a higher crystal frequency can be used. This is im- portant when ...

  • Page 21

    E3MODE[1:0] in the Modes register when E1MODE is not enabled. E3MODE1 E3MODE0 0 0 Total Reactive Energy 0 1 Power Fail Monitor Total Apparent Energy Table 5. E3 Pin Configuration When both E2MODE bits are high, ...

  • Page 22

    For each enabled input channel, the measured value is rectified and compared to the associated level register . Over the duration window, the number of samples above and below the level are counted. If the number of samples below the ...

  • Page 23

    USING THE CS5467 7.1 Initialization The CS5467 uses a power-on-reset circuit (POR) to provide an internal reset until the analog voltage reach- es 4.0 V. The RESET input pin can also be used by the application circuit to reset ...

  • Page 24

    Command Interface Commands and data are transferred most-significant bit (MSB) first. Figure 1 on page 12, defines the serial port timing. Commands are clocked in on SDI using SCLK. They are a single byte (8 bits) long and fall ...

  • Page 25

    Commands All commands are 1 byte (8 bits) long. Many command values are unused and should NOT be written by the application program. All commands except register reads, register writes, or synchronizing commands will abort any conversion, calibration, or ...

  • Page 26

    Calibration CAL5 CAL4 CAL3 CAL2 CAL1 CAL0 The CS5467 can perform gain and offset calibrations using either signals. Proper input levels must be applied to the current inputs and ...

  • Page 27

    Register Read and Write W/R RA4 RA3 RA2 Read and Write commands provide access to on-chip registers. After a Read command, the addressed data can be clocked out the SDO pin by SCLK. ...

  • Page 28

    Page1 Registers Address RA[4:0] Name 0 00000 I1 1 00001 I1 2 00010 V1 3 00011 V1 4 00100 P1 5 00101 I1 6 00110 V1 7 00111 I2 8 01000 I2 9 01001 V2 10 01010 V2 11 01011 ...

  • Page 29

    REGISTER DESCRIPTIONS 1. “Default” = bit states after power-on or reset 2. DO NOT write a “1” to any unpublished register bit NOT write to any unpublished register address. 8.1 Page Register 8.1.1 Page Address: 31, Write-only, ...

  • Page 30

    Instantaneous Current (I1, I2), Voltage (V1, V2), and Power (P1, P2) Address MSB 0 -1 ...

  • Page 31

    Peak Current ( PEAK Address PEAK MSB -( Peak current PEAK PEAK samples with the greatest magnitude ...

  • Page 32

    Internal Status (Status) and Interrupt Mask (Mask) Address Status ); 26 ( Mask ) 23 22 DRDY I2OR V2OR 15 14 E2OR I1ROR V1ROR 7 6 TUP V2OD I2OD Default = 1 ( Status ), 0 ( ...

  • Page 33

    Control (Ctrl) Address: 28 – PC7 PC6 I1gain Default = 0 PC[7:0] Phase compensation for channel 2. Sets a delay in voltage relative to current. Phase is signed and ...

  • Page 34

    Page 1 Registers 8.3.1 DC Offset for Current (I1 Address OFF OFF MSB -( Default = 0 DC offset registers I1 & ...

  • Page 35

    Mode Control (Modes) – VFIX E1MODE1 E1MODE0 7 6 IHPF2 VHPF1 IHPF1 Default = 0 VFIX Use internal RMS voltage reference instead of voltage input for average active power Use voltage ...

  • Page 36

    Line to Sample Frequency Ratio (Epsilon) MSB -( Default = 0.0125 (4.0 kHz x 0.0125 or 50 Hz) Epsilon is the ratio of the input line frequency to the ...

  • Page 37

    Temperature Gain (T GAIN MSB Default = 0x2F02C3 Refer to 6.13 Temperature Measurement 8.3.12 Temperature Offset (T OFF MSB -( ...

  • Page 38

    System Gain (G) Address: 28 – MSB -( Default = 1.25 System Gain ( applied to all channels. By default 1.25, but can be ...

  • Page 39

    Page 2 Registers 8.4.1 Voltage Sag and Current Fault Duration (V1Sag Address V1Sag ), 8 ( V2Sag DUR MSB Default = 0 Voltage sag duration, V1Sag the count ...

  • Page 40

    SYSTEM CALIBRATION 9.1 Calibration The CS5467 provides DC offset and gain calibration that can be applied to the voltage and current measure- ments, and AC offset calibration which can be applied to the voltage and current RMS calculations. Since ...

  • Page 41

    Gain Calibration During gain calibration, a full-scale reference signal must be applied to the meter or optionally, scaled to the VIN1 ± ( VIN2 ±) , IIN1 ± (IIN2 ±) pins of the CS5467 reference must be ...

  • Page 42

    E PROM OPERATION The CS5467 can accept commands from a serial 2 E PROM connected to the serial interface instead of a host microcontroller. A high level (logic 1) on the MODE 2 input indicates that an E ...

  • Page 43

    BASIC APPLICATION CIRCUITS Figure 14 shows the CS5467 configured to measure power in a single-phase, 3-wire system while operating in a single-supply configuration. In this diagram, current 500 Ω ...

  • Page 44

    PACKAGE DIMENSIONS 28L SSOP PACKAGE DRAWING TOP VIEW INCHES DIM MIN 0.002 A2 0.064 b 0.009 D 0.390 E 0.291 E1 0.197 e 0.022 L 0.025 ∝ 0° Notes: 1. “D” ...

  • Page 45

    ORDERING INFORMATION Model CS5467-IS CS5467-ISZ (lead free) 14. ENVIRONMENTAL, MANUFACTURING, & HANDLING INFORMATION Model Number CS5467-IS CS5467-ISZ (lead free) * MSL (Moisture Sensitivity Level) as specified by IPC/JEDEC J-STD-020. DS714F1 Temperature -40 to +85 °C Peak Reflow Temp MSL ...

  • Page 46

    REVISION HISTORY Revision Date PP1 FEB 2007 Initial release. PP2 FEB 2007 Corrections to implicitly state that temperature measurement is a secondary func- tion of voltage2 channel. Updated typical connection diagram. Changed Phase Compensation Range from ±2.8° to ±5.4°. ...