CN0188 Evaluation Board Guide

Overview

CN0188 is a circuit that monitors current in individual channels of −48 V to better than 1% accuracy. The load current passes through a shunt resistor, which is external to the circuit. The shunt resistor value is chosen so that the shunt voltage is approximately 50 mV at maximum load current. The entire circuit operates on a single +3.3 V supply.

The AD7171 is a very low power, 16-bit, analog-to-digital converter (ADC). It contains a precision, 16-bit, Σ-Δ ADC and an on-chip oscillator. The measurement result from AD7171 is provided as a digital code utilizing a simple 2-wire, SPI-compatible serial interface. Optional galvanic isolation is provided by the ADUM5402 quad channel isolator. In addition to isolating the output data, the digital isolator can also supply isolated +3.3 V for the circuit.

The ADA4051-2 is a CMOS, micropower, zerodrift operational amplifier utilizing an innovative chopping technique. This amplifier feature rail-to-rail input/output swing and extremely low offset voltage while operating from a 1.8 V to 5.5 V power supply.

The ADR381 is precision 2.500 V band gap voltage reference featuring high accuracy, high stability, and low power consumption in a tiny footprint. It is a micropower, low dropout voltage (LDV) device that provides a stable output voltage from supplies as low as 300 mV above the output voltage.

The EVAL-CN0188-SDPZ Board connects to ADI’s System Demonstration Platform (SDP) and is powered by a +6 V supply or +6 V “wall wart”.

Required Equipment

EVAL-CN0188-SDPZ Evaluation Board
EVAL-SDP-CB1Z Controller Board (SDP-B Board)
CN0188 Evaluation Software
Power Supply
- 6 V or 6 V Wall wart
PC with the following Minimum Requirements
- Windows 7 (32-bit), Windows Vista (32-bit) or Windows XP
- USB interface
Shunt resistor with maximum voltage of 50 mV at the maximum load current
Electronic load

General Setup

Block assignments

Do not connect the USB cable to the Mini-USB connector on the SDP board before turning on the dc power supply for the EVAL-CN0188-SDPZ.

Installing the Evaluation Software

Extract the file CN0188_Evaluation_Software.zip and open the file setup.exe.

NOTE: It is recommended that you install the CN0188 Evaluation Software to the default directory path C:\Program Files (x86)\Analog Devices\CN0188\ and all National Instruments products to C:\Program Files\National Instruments\
Click Next to view the installation review page
Click Next to start the installation
Upon completion of the installation of the CN-0188 Evaluation Software, the installer for the ADI SDP Drivers will execute.

NOTE: It is recommended that you close all other applications before clicking “Next”. This will make it possible to update relevant system files without having to reboot your computer.
Press “Next” to set the installation location for the SDP Drivers.

It is recommended that you install the drivers to the default directory path
C:\Program Files\Analog Devices\SDP\Drivers
Press “Install” to install the SDP Drivers and complete the installation of all software. Click “Finish” when done.