CDB5467U Cirrus Logic Inc, CDB5467U Datasheet
CDB5467U
Specifications of CDB5467U
CDB-5467U
Related parts for CDB5467U
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°. ...