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VIN+

VIN-

IIN+

IIN-

REF+

+2.5 V

Reference

CS5466

VREFOUT

VREFIN

FOUT

NEG

CONFIGURATION JUMPERS

IGAIN0

IGAIN1

FREQ0

FREQ1

C8051F320

Microcontroller

USB

HPF

XIN

XOUT

4.096MHz

FREQ2

VIN+

VIN-

IIN+

IIN-

E1 E2 FOUT NEG

VREF SOURCE

Vu+ EXT

VD+ EXTGND

+5V

CDB5466U

CDB5466U Evaluation Board

Features

 Active Energy-to-Pulse Conversions

 Simple Configuration Jumpers

– Current Channel Gain

– High-pass Filter

– Energy-to-pulse Output Frequency

 Energy Pulses

– Collected by On-board Microcontroller

– Available on External Header

– Viewable via LEDs

 Multiple Supply Voltage Selections

 USB Communication with PC

 On-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

CDB5466U Evaluation Board

MAY ‘05

DS676DB1

Summary of content (21 pages)

PAGE 1
\ CDB5466U CDB5466U Evaluation Board Features 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 performance of the CS5466. Active Energy-to-Pulse Conversions Simple Configuration Jumpers – Current Channel Gain – High-pass Filter – Energy-to-pulse Output Frequency The evaluation board is designed to output energy-topulse conversions upon power-up.
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CDB5466U TABLE OF CONTENTS 1. 2. 3. 4. LIST OF FIGURES .................................................................................................................... 2 LIST OF TABLES ...................................................................................................................... 2 HARDWARE ............................................................................................................................. 3 1.1 Introduction ............................................
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CDB5466U 1. HARDWARE 1.1 Introduction The CS5466 is a low cost power measurement solution combining two ∆Σ analog-to-digital converters (ADCs), an energy-to-frequency converter, and energy pulse outputs on a single chip. It is designed to accurately measure and calculate energy for single phase, 2- or 3-wire power metering applications with minimal external components.
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CDB5466U The CDB5466U evaluation board is partitioned into two main sections - analog and digital. The analog section consists 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.
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CDB5466U 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 connected to the reference voltage selected on J12.
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CDB5466U Maximum Input Range IGAIN1 IGAIN0 J31 J32 VD+ IGAIN1 O GND O (Default) VD+ IGAIN0 O GND O (Default) ±250mV 10x ±50mV 50x VD+ IGAIN1 GND O O VD+ IGAIN0 GND O O ±25mV 100x VD+ IGAIN1 GND O O VD+ IGAIN0 GND O O ±16.67mV 150x VD+ IGAIN1 GND O O VD+ IGAIN0 GND O O Table 4. Current Channel PGA Selection 1.2.2.2 High-pass Filter By removing the offset from either channel, no error component will be generated at DC when computing the active (real) power.
PAGE 7
CDB5466U 1.2.2.4 Selecting Frequency of E1 and E2 The pulse rate on E1 and E2 can be set to one of four frequency ranges. Input pins FREQ1 and FREQ0 determine the maximum frequency on E1 and E2 for sine wave inputs with zero phase shift. The frequency of E2 is equal to the frequency of E1 with active-low alternating pulses. Table 6 illustrates the options available.
PAGE 8
CDB5466U 1.2.3 Power Supply Section Table 7 illustrates the power supply connections to the evaluation board. The +5 binding post (J3) supplies the positive analog supply (VA+) for the CS5466 and the +2.5 V reference. The VD+_EXT binding post (J5) supplies the digital section of the CS5466 (VD+) and level shifters. Jumper J8 allows the VD+ supply to be sourced from the VD+_EXT binding post (J5), the +5 V binding post (J3), or the regulated +3.3 V supply derived from the microcontroller.
PAGE 9
CDB5466U 2. SOFTWARE The evaluation board comes with a USB cable to link the evaluation board to the PC. The evaluation software is available for download on the Cirrus Logic web site at http://www.cirrus.com/industrialsoftware and is designed to run under Windows® 2000 or Windows® XP. 2.1 Installation Procedure The CDB5466U is designed to perform active energy measurement and output energy pulse registration upon powering up. Evaluation software is available to aid in registering energy pulse outputs.
PAGE 10
CDB5466U 2.2.1.1 Setup Setup presents the communication connections available to the CDB5466U Evaluation Board. The CDB5466U has one connection option available, USB. As depicted in Figure 2, if the USB setup is selected, the evaluation software will poll the CDB5466U, verifying the serial communication link is ready. At this point USB is checked indicating that the PC has successfully communicated with the CDB5466U Evaluation Board.
PAGE 11
CDB5466U 2.2.1.3 Menu Menu allows one selection option, Pulse Rate Window. The Pulse Rate Window provides a means to register the energy-to-pulse outputs. See Figure 5. Figure 5. CDB5466 Evaluation Board Upon selecting Pulse Rate Window, the CS5466 Pulse Rate Output Window will appear. 2.2.2 CS5466 Pulse Rate Output Window The Pulse Rate Output Window provides a means to access the E1, E2 and FOUT pin of the CS5466. See Figure 6. Figure 6.
PAGE 12
CDB5466U 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.
PAGE 13
CDB5466U Figure 7. Analog Inputs 3.
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Figure 8.
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Figure 9.
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Figure 10.
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DS676DB1 Figure 1. Silk Screen Figure 11.
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CDB5466U Figure 1. Topside Layer 4.
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Figure 1.
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CDB5466U 20 DS676DB1
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CDB5466U Contacting Cirrus Logic Support For all product questions and inquiries contact a Cirrus Logic Sales Representative. To find one nearest you go to www.cirrus.com IMPORTANT NOTICE Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied).