Analog.com Analog Dialogue Wiki 简体中文
EngineerZone
EngineerZone
  • Log In
  • Site
  • Search
  • User
  • Support

    Popular Forums

    • RF and Microwave
    • Power Management
    • Video
    • FPGA Reference Designs
    • Precision ADCs
    • Linux Software Drivers
    • SigmaDSP Processors & SigmaStudio Dev. Tool

    Product Forums

    • A2B
    • Amplifiers
    • Analog Microcontrollers
    • Clock and Timing
    • Data Converters
    • Direct Digital Synthesis (DDS)
    • Energy Monitoring and Metering
    • Interface and Isolation
    • MEMS Inertial Sensors
    • Processors and DSP
    • Switches/Multiplexers
    • Temperature Sensors
    • Voltage References
    View All

    Application Forums

    • Audio
    • Automated Test Equipment (ATE)
    • Condition-Based Monitoring
    • Depth, Perception & Ranging Technologies
    • Embedded Vision Sensing Library
    • Motor Control Hardware Platforms
    • Optical Sensing
    • Precision Technology Signal Chains Library
    • Video
    • Wireless Sensor Networks Reference Library

    Design Center Forums

    • ACE Evaluation Software
    • ADEF System Platforms
    • Design Tools and Calculators
    • FPGA Reference Designs
    • Linux Software Drivers
    • Microcontroller no-OS Drivers
    • Reference Designs
    • Signal Chain Power (SCP)
    • Software Interface Tools
    • System Demonstration Platform (SDP) Support
  • Learn

    Highlighted Webinar

    Audio Design Solutions for Augmented and Virtual Reality (AR/VR) Glasses

    Recent Discussions

    • Standalone Data logging using ADALM2000
    • About sdr.tx(). Can I change the transmitter frequency after call this function?
    • About the values of CurV1,2 displayed in the cursors frame of scopy.
    • Purpose of "Load" in Scopy signal generator configuration GUI
    • about the transient response experiment example of RL Circuit using adalm2000

    Places

    • ADI Education Home
    • ADI Education China
    • ADI Education India
    • ADI Education Philippines
    • StudentZone (Analog Dialogue)
    • Virtual Classroom

    Latest Webinars

    • Audio Design Solutions for Augmented and Virtual Reality (AR/VR) Glasses
    • Robust Industrial Motor Encoder Signal Chain Solutions
    • Precision Low Power Measurement Solutions for Intelligent Edge
    • Advantages of Integrating Digital Power System Management (DPSM) into your Design
    • Optimizing GaN and GaAs RF Amplifier Performance Using Novel Biasing Techniques
    View All Webinars
  • Community Hub

    Challenge Yourself!

      KCC's Quizzes AQQ231 about Birthdays and Cake Candles
    View All

    Places

    • Community Help
    • Logic Lounge

    Resources

    • EZ Code of Conduct
    • Getting Started Guide
    • ADI: Words Matter
    • Community Help Videos
    View All
  • Blogs

    Highlighted Blogs

    Understanding Public Key Infrastructures

     

    Share Your Insights! How Can We Improve Your Engineering Design Needs?

    Latest Blogs

    • 10BASE-T1L Makes Powering Intelligent Field Instruments Painless
    • Using Python To Control The Pluto Radio And Plot Data
    • Resistance is NOT Futile
    • What is The Continuity of Engineering?
    • Move Over Sensors: Actuators Are Entering The Smart Factory Stage
    Read All Blogs

    ADI Blogs

    • EZ Spotlight
    • The Engineering Mind
  • Partners

    Electronic Design Services - PartnerZone

    • Boston Engineering
    • Calian, Advanced Technologies
    • Colorado Engineering Inc. (DBA CAES AT&E)
    • Clockworks Signal Processing
    • Epiq Solutions
    • Fidus
    • PalmSens
    • Richardson RFPD
    • Tri-Star Design, Inc.
    • VadaTech
    • Vanteon
    • X-Microwave
    View All
Precision DACs
  • Data Converters
Precision DACs
Documents AD5422: 3 pin SPI interface
  • Forums
  • File Uploads
  • FAQs/Docs
  • Members
  • Tags
  • More
  • Cancel
  • +Documents
  • +AD3552R: FAQ
  • +AD420: FAQ
  • +AD421: FAQ
  • +AD5024: FAQ
  • +AD5060: FAQ
  • +AD5065: FAQ
  • +AD5115: FAQ
  • +AD5116: FAQ
  • +AD511: FAQ
  • +AD5121: FAQ
  • +AD5141: FAQ
  • +AD5142: FAQ
  • +AD5160: FAQ
  • +AD5161: FAQ
  • +AD5203: FAQ
  • +AD5206: FAQ
  • +AD5222: FAQ
  • +AD5232: FAQ
  • +AD5235: FAQ
  • +AD5243: FAQ
  • +AD5245: FAQ
  • +AD5248: FAQ
  • +AD524: FAQ
  • +AD5251: FAQ
  • +AD5252: FAQ
  • +AD5254: FAQ
  • +AD5258: FAQ
  • +AD5259: FAQ
  • +AD5263: FAQ
  • +AD5270: FAQ
  • +AD5271: FAQ
  • +AD5272: FAQ
  • +AD527x: FAQ
  • +AD5290: FAQ
  • +AD5292: FAQ
  • +AD5293: FAQ
  • +AD5301: FAQ
  • +AD5318: FAQ
  • +AD5321: FAQ
  • +AD5323: FAQ
  • +AD5325: FAQ
  • +AD5331: FAQ
  • +AD5338: FAQ
  • +AD53500: FAQ
  • +AD5363: FAQ
  • +AD536x: FAQ
  • +AD5370: FAQ
  • +AD5383: FAQ
  • +AD5384: FAQ
  • +AD5405: FAQ
  • +AD5412: FAQ
  • +AD5413: FAQ
  • +AD5420: FAQ
  • +AD5421: FAQ
  • -AD5422: FAQ
    • AD5422: HART compatability
    • AD5422: What is the role of R27 Socket in AD5422's EVB?
    • AD5422: 3 pin SPI interface
    • AD5422_SPI daisy chain reading
    • AD5422 - Connecting multiple DVCC outputs together
  • +AD5429: FAQ
  • +AD5439: FAQ
  • +AD5440: FAQ
  • +AD5443: FAQ
  • +AD5446: FAQ
  • +AD5449: FAQ
  • +AD548B: FAQ
  • +AD549: FAQ
  • +AD5522: FAQ
  • +AD5544: FAQ
  • +AD5546: FAQ
  • +AD5553: FAQ
  • +AD5554: FAQ
  • +AD5556: FAQ
  • +AD557: FAQ
  • +AD5592R: FAQ
  • +AD5593R: FAQ
  • +AD5623R: FAQ
  • +AD5627: FAQ
  • +AD5640: FAQ
  • +AD565A: FAQ
  • +AD5660: FAQ
  • +AD5662: FAQ
  • +AD5664: FAQ
  • +AD5668: FAQ
  • +AD5669R: FAQ
  • +AD5696R: FAQ
  • +AD5700: FAQ
  • +AD5722R: FAQ
  • +AD5724: FAQ
  • +AD574: FAQ
  • +AD5750: FAQ
  • +AD5755: FAQ
  • +AD5761: FAQ
  • +AD5764: FAQ
  • +AD5780: FAQ
  • +AD5791: FAQ
  • +ad667: FAQ
  • +AD674: FAQ
  • +AD688: FAQ
  • +AD693: FAQ
  • +AD694: FAQ
  • +AD698: FAQ
  • +AD8403: FAQ
  • +AD8842: FAQ
  • +AD9913: FAQ
  • +ADG506ATE: FAQ
  • +DAC Communication Troubleshooting: FAQ
  • +DAC Daisy Chain: FAQ
  • +DAC Power-up sequence and Biasing: FAQ
  • +DAC SPI: FAQ
  • +DAC8800: FAQ
  • +GENERAL: FAQ
  • +nanoDAC+: FAQ
  • +Precision Technology Learning Modules
  • +LTC2688: FAQ

AD5422: 3 pin SPI interface

Q 

Regarding AD5422:

Why does its SPI interface not have a chip select pin?

There is a LATCH pin but it doesn't make the system SPI compatible.

Without a chip select pin it impossible to use a device on a SPI bus together
with other SPI devices. (without additional logic)

SCLK and MOSI must be ignored and MISO must go tristate when the device is not
selected. (That is SPI standard)

Questions:

1)
Do you have special devices to make AD5422 fully SPI compatible?

(We could manage it with external logic or a GAL for multiple AD5422 devices
but that has other dissadvantages (in production) we don't want to deal with)

2)
Is there a replacement for the AD5422 that is fully SPI compatible
(including chip select,same features, same accuracy)?

 

A 

The AD5422 will operate on an SPI bus. The LATCH signal can be operated as a CS
signal and used to frame the serial data as shown below.From the point of view
of the AD5422, the rising edge of the LATCH signal is the important event that
latches data into the AD5422, however it does not matter when the LATCH signal
returns low, for SPI compatibility the LATCH signal can be brought low before
the first clock edge and then brought high after the 24th clock edge. There is
no maximum specification on timing parameter t8.

By default the SDO pin (MISO) is tri-state. It will enable if a read is
requested of the AD5422 and tri-state again once the read operation is complete.
When the LATCH signal is brought high the previous 24 bits to be clocked on the
bus will be latched by the AD5422. A write operation tot he AD5422 can be
performed as follows; bring LATCH low, clock 24 bits of data, bring LATCH high.
  • ad5422
  • Share
  • History
  • More
  • Cancel
Related
Recommended
Social
Quick Links
  • About ADI
  • ADI Signals+
  • Analog Dialogue
  • Careers
  • Contact us
  • Investor Relations
  • News Room
  • Quality & Reliability
  • Sales & Distribution
  • Incubators
Languages
  • English
  • 简体中文
  • 日本語
Newsletter

Interested in the latest news and articles about ADI products, design tools, training and events? Subscribe today!

Sign Up
Analog Logo
©1995 - 2023 Analog Devices, Inc. All Rights Reserved
沪ICP备09046653号-1
  • Sitemap
  • Legal
  • Privacy & Security
  • Privacy Settings
EngineerZone Uses cookies to ensure you get the best experience in our community. For more information on cookies, please read our Privacy & Security Statement.