MAXREFDES24# datasheet, PDF - EEWORLD Datasheet

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MAXREFDES24#: DescriptionREFERENCE DESIGN ALAMEDA; CategoryDevelopment board/suite/development tools; File Size448KB，11 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html; Environmental Compliance

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MAXREFDES24# Overview

REFERENCE DESIGN ALAMEDA

MAXREFDES24# Parametric

Parameter Name	Attribute value
type	interface
Function	sensor signal conditioner
Embedded	-
IC/parts used	MAX5134
Main attributes	Pmod™ compatible
What's included	plate
Auxiliary properties	-

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Alameda (MAXREFDES24#): 4-Channel Analog Output - Reference Schematic - Maxim

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Keywords:

Alameda MAXREFDES24, analog output, programmable logic controllers, industrial control and

automation

Related Parts

REFERENCE SCHEMATIC 5839

ALAMEDA (MAXREFDES24#): 4-CHANNEL ANALOG OUTPUT

May 06, 2014

Abstract: The Alameda (MAXREFDES24#) subsystem reference design features four dense, highly accurate

analog outputs in a compact, galvanically isolated form factor. Each channel provides current or voltage. This

design uniquely fits in programmable logic controllers (PLC), distributed control systems (DCS), and other

industrial applications. Hardware, firmware design files, and lab measurements are provided for rapid

prototyping and development. The board is also available for purchase.

Introduction

Alameda connects to Pmod-compatible field-programmable gate array

(FPGA)/microcontroller development boards. Alameda requires a 3.3V supply

voltage from the

Pmod

connector and uses the

SPI

pin assignments as

illustrated on the right.

The power requirements are shown in

Table 1.

Note that the external +24V

power supply is required for full system operation. The currently supported

platforms and ports are shown in

Table 2.

Table 1. Power Requirements for the Alameda Subsystem Reference Design

Power Name

Input Voltage (V)

Input Current (mA, typ)

3.3V Pmod Power Supply

3.3

+24V

18 to 32

140

Table 2. Supported Platforms and Ports

Supported Platforms

Communication Ports

Physical Support Ports

-6)

LX9 platform (Spartan

J5 (no electrical connection)

-7020)*

ZedBoard platform (Zynq

JB1

JA1 (no electrical connection)

*Tested with ZedBoard Rev C.

The MAX15500 (U1–U4) is a single-channel, low-cost, precision analog current/voltage output conditioner

developed to meet the requirements of PLCs and other industrial control and automation applications. The

MAX15500 operates from a ±15V to ±32.5V power-supply range.

The MAX15500 can generate both unipolar and bipolar current and voltage outputs. In current mode, the

device produces currents of -1.2mA to +24mA or -24mA to +24mA. In voltage mode, the device produces

voltages of -0.3V to +6V, -0.6V to +12V, or ±12V. To allow for overrange and underrange capability in

unipolar mode, the

transfer

function of the MAX15500 is offset so that when the voltage at AIN is 5% of full

scale, IOUT is 0mA and VOUT is 0V. Once VAIN attains full scale, VOUT or IOUT becomes full scale +5% or

+20% depending on the state of FSMODE.

The MAX15500 protects against overcurrent and short-circuit conditions when OUT goes to ground or a

voltage up to ±32.5V. The device also monitors for overtemperature and supply brownout conditions. The

supply brownout threshold is programmable between ±10V and ±24V in 2V increments. The MAX15500

provides extensive error reporting of short-circuit, open-circuit, brownout, and overtemperature conditions

through the SPI interface and an additional

open-drain

interrupt output (ERROR). The MAX15500 also

includes an analog 0 to 3V output (MON) to monitor the load condition at OUT.

The MAX5134 (U5) is a quad 16-bit, buffered voltage-output, high-linearity DAC. The device features 4-

channel, very low deadband (0.02V max) rail-to-rail outputs. For most applications, no negative biasing

power supply is required.

The MAX6126 (U6) drives the analog output conditioners and the DAC's reference inputs with an ultra-high-

precision 4.096V voltage reference with 0.02% initial accuracy and a 3ppm/°C maximum

temperature

coefficient (tempco).

The DAC's outputs directly drive the conditioners' inputs with no external components, making the interface

simple.

The MAX17498B (U8) provides an isolated, functional insulation class power solution that accepts single

+18V to +32V DC voltage and converts it to ±24V and +8V using an isolation transformer in flyback

architecture. Post-regulation is accomplished using the MAX1659 LDO (U9) for the 5V output.

Data isolation between the subsystem and the controller is accomplished using the MAX14850 (U7) digital

data isolator. The combined power and data isolation achieved is 600V

RMS

Detailed Description of Firmware for LX9 and ZedBoard

Platforms

Table 2 shows the currently supported platforms and ports. Support for additional platforms may be added

periodically under Firmware Files in the All Design Files section.

The Alameda firmware released for the LX9

development kit

targets a Microblaze

™

soft-core microcontroller

placed inside a Xilinx

Spartan-6 FPGA. The Alameda firmware also supports the ZedBoard kit and targets

an ARM

Cortex

-A9 processor placed inside a Xilinx Zynq system-on-chip (SoC).

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