CDB5466U CIRRUS | Alldatasheet
Document overview
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Technical content
Features
zActive Energy-to-Pulse Conversions zSimple Configuration Jumpers – Current Channel Gain – High-pass Filter – Energy-to-pulse Output Frequency z Energy Pulses – Collected by On-board Microcontroller – Available on External Header – Viewable via LEDs zMultiple Supply Voltage Selections zUSB Communication with PC zOn-board Voltage Reference General Description The CS5466 is a low cost power/energy IC with pulse output for power measurement solutions. The CDB5466U Evaluation Board is an inexpensive tool designed to evaluate the functionality and perfor- mance of the CS5466. The evaluation board is designed to output energy-to- pulse conversions upon power-up. The CS5466 data sheet should be read and consulted when using the CDB5466U evaluation board. The evaluation board includes a microcontroller with a USB interface. The microcontroller and GUI (Graphi- cal User Interface) provide a means to quickly register and evaluate the CS5466’s energy-to-pulse outputs.
ORDERING INFORMATION
MAY ‘05 DS676DB1
calculate energy for single phase, 2- or 3-wire power metering applications with minimal external components. until the supply reaches the proper level. The CDB5466U is shipped with a CS5466-ISZ device located at U6. Figure 1. CDB5466U Assembly Drawing
The CDB5466U evaluation board is partitioned into two main sections - analog and digital. The analog section con- sists of the CS5466 and a precision voltage reference that operates from a single +5 V power supply. The digital section consists of the microcontroller, the reset circuitry, and the USB interface. The digital section can operate from a +5 V or +3.3 V power supply. The evaluation board is epuipped with power supply connections that accommodate all of the various supply options of the CS5466. The evaluation board is designed to output energy-to-pulse conversions upon power-up. Software that runs on a PC provides a GUI (Graphical User Interface) as a means to quickly register and evaluate the CS5466’s energy-to-pulse outputs. To accomplish this, the board comes equipped with USB drivers and cable which physically interfaces the evaluation board to the PC. The software provides easy access to the energy outputs E1, E2, and FOUT and pro- vides a means to display and evaluate the performance of the CS5466. 1.2.1 Analog Section The CDB5466U evaluation board provides screw-type terminals (J23 and J27) to connect input signals to the volt- age and current channels. The screw terminals are labeled as VIN+, VIN-, IIN+, and IIN-. A simple R-C network at each channel input provides a simple anti-alias filter. The evaluation board provides three voltage reference options for VREFIN to the CS5466. The three voltage refer- ence options include: VREFOUT from the CS5466, the on-board +2.5 V reference, and external REF+ (screw ter- minal J14). Table 1 and Table 2 illustrate the options available for VREFIN. With a jumper on J25 in the position labeled VREFOUT, the reference is supplied by the on-chip voltage reference. With a jumper on J25 in the position labeled VREF, the reference is supplied by an off-chip voltage reference. Table 2 illustrates the options available for VREF. With a jumper on J12 in position LT1019, the LT1019 provides a +2.5 V reference (the LT1019 was chosen for its low drift - typically 5ppm/°C). By setting the jumper on J12 to posi- tion REF+, an external voltage reference is supplied via screw terminal J14’s REF+ input. The three input signal options for the voltage (VIN±) and current (IIN±) channel input include: an external signal (screw terminals J23 and J27), GND or VREF. Table 3 illustrates the options available. By installing jumpers on J17 Reference
Description
Reference (25ppm/°C) VREF Selects External or LT1019 Reference(J12) Table 1. Internal Voltage Reference Selection for VREF (5ppm/°C) REF+ Selects External Reference Source (J6) Table 2. External Voltage Reference Selection for VREF
to position VIN+, J22 to position VN-, J24 to position IIN+ and J26 to position IIN-, the input voltage signal is supplied from the screw terminals J23 and J27. With a jumper on J17, J22, J24 and J26 in the GND position, the inputs are connected to analog ground (AGND). With a jumper on J17, J22, J24 and J26 in position VREF, the inputs are con- nected to the reference voltage selected on J12. 1.2.2 Digital Section The digital section contains the microcontroller, USB interface, JTAG header, reset circuitry, and an external inter- face header (J11). The microcontroller interfaces the energy pulses, E1, E2, and FOUT output by the CS5466 with the USB connection to the PC. The microcontroller also provides a hardware reset to the CS5466, which is level shifted to support both +3.3 V and +5 V digital operation. Interface header, J11, is provided to allow the CDB5466U to be connected to an external energy registration device. The energy output pins E1, E2, FOUT and NEG are routed to LEDs which provide a simple visual check of the energy output pulses. Jumpers J10, J13, J15 and J16 are equipped at the factory with jumpers to enable the LEDs. 1.2.2.1 Current Channel Gain To accommodate different current-sensing elements the current channel incorporates a programmable gain that can be set to one of four input ranges. Input pins IGAIN1 and IGAIN0 define the four gain selections and corresponding maximum input signal level. Jumpers J31 and J32 define the state of IGAIN1 and IGAIN0, respectively. Table 4 il- lustrates the options available. With jumpers J31 = J32 = GND the gain is set to 10x. With jumpers J31 = GND and J32 = VD+ the gain is set to 50x. With jumpers J31 = VD+ and J32 = GND the gain is set to 100x. With jumpers J31 = VD+ and J32 = VD+ the gain is set to 150x. INPUT VIN± or IIN± Selects External Signal VIN± or IIN± Selects External Signal GND Selects Grounding the Input VREFIN Selects Reference Source Table 3. Voltage and Current Channel Input Signal Selection
(real) power. Input pin HPF defines the three options, and J33 defines the state of the HPF pin. – HPF is enabled in the voltage channel when jumper J33 = GND. – HPF is enabled in the current channel when pin HPF is connected to pin FOUT. – High-Pass Filter (HPF) is disabled when jumper J33 = VD+. of 8000 Hz. The FOUT output is available on header J11, pin 5. Table 4. Current Channel PGA Selection Table 5. HPF Option Selection
the frequency of E1 with active-low alternating pulses. Table 6 illustrates the options available. J30, if the maximum peak differential signal applied to both channels is a sine wave with zero phase shift. Table 6. Energy Output Frequency
or VD+_EXT binding post (J5). Table 7. Power Supply Connections
run under Windows® 2000 or Windows® XP. Cirrus Logic WEB site at http://www.cirrus.com/industrialsoftware and refer to application note AN278. is powered on, the software program can be launched. software’s title, revision number, copyright date, etc. See Figure 2. Figure 2. CDB5466U Start-up Window munication with the CDB5466U evaluation board the Menu item will become available.
In the CS5466 Pulse Rate Output Window, the Pulse Count, Frequency, Average Freq and Standard Deviation are displayed for the three energy-to-pulse outputs. Count Span: The Count Span entry allows for a time period to be specified for counting the energy pulses output by the CS5466. The Count Span is a decimal number having a range of 0.18 < Count Span < 167,772, with units of seconds. Periods to Average: The Periods to Average entry allows an average to be performed on the pulses counted during the specified Count Span. The Periods to Average is an integer with a range of 1 < Periods to Average < 10,000. Reset DUT: When this button is selected, the evaluation software will request the microcontroller to hardware reset the CS5466. The CS5466 will perform a reset as discussed in the CS5466 data sheet. Start/Stop: Initially the Stop button is hidden. When the Start button is selected, the evaluation software will instruct the microcontroller to start counting the energy-to-pulse outputs from the CS5466. At this time the Start button is disabled and the Stop button will appear. The evaluation software will then collect the Pulse Count over a duration of time specified (in seconds) by the Count Span. The counted pulses will then be averaged over the specified Pe- riods to Average entry. The Pulse Count and calculated Frequency, Average Freq and Standard Deviation will be displayed at the end of the cycle.
Figure 7. Analog Inputs
Figure 8. CS546x and Socket
Figure 9. CS5462 and CS5466 Configuration
Figure 10. Microcontroller and USB Interface
Figure 1. Topside Layer
Figure 1. Bottomside Layer
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