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

    Multidimensional Simulations of Beamformers and other RF Integrated Circuits in Keysight SystemVue

    Recent Discussions

    • Issue running built programs on Pluto
    • Activity: Simple Op Amps, For ADALM1000 Fig. 1.3 Buffering example
    • ADALM-PLUTO [NETWORK] vs [USB_ETHERNET]
    • Using buffer size different from 2**n
    • ADALM1000 Pixelpulse feature Source Voltage / Measure Current explanation

    Places

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

    Latest Webinars

    • Multidimensional Simulations of Beamformers and other RF Integrated Circuits in Keysight SystemVue
    • Improve Smart Building Energy Efficiency with Industrial Ethernet Controlled Air Conditioning (HVAC) Systems
    • Sustainable Motion Control Solutions for High Performance Servo Drives
    • Audio Design Solutions for Augmented and Virtual Reality (AR/VR) Glasses
    • Robust Industrial Motor Encoder Signal Chain Solutions
    View All Webinars
  • Community Hub

    Challenge Yourself!

      KCC's quizzes AQQ235 about a bipolar common emitter amplifier - a kind proposal from our colleague Martin Walker
    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

    Hardware Holds The Key To Making Industrial Systems IEC 62443 Compliant

     

    Behind the Scenes of DIYRadio Blogs: An Introduction

    Latest Blogs

    • Empowering Surveillance Cameras To Capture A Scene Without Being Heard
    • Mastering The Metrics Makes Specifying Encoders Simpler
    • Understanding Secret Key Cryptography Without Formulas
    • 3 Reasons Why IO-Link is Changing Smart Factory Decision Making
    • EMC Mitigation: The Finer Points of Ferrite Beads
    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
8052 Core Products
  • Analog Microcontrollers
8052 Core Products
Documents My customer has some technical problems/questions about ADuC848.
  • Q&A
  • Docs/FAQs
  • Members
  • Tags
  • More
  • Cancel
  • Documents
  • +ADuC812: FAQ
  • +ADUC814: FAQ
  • +ADUC816: FAQ
  • +ADUC824: FAQ
  • +ADuC831: FAQ
  • +ADUC832: FAQ
  • +ADUC834: FAQ
  • +ADuC836: FAQ
  • +ADuC83x: FAQ
  • +ADUC841: FAQ
  • +ADuC842: FAQ
  • +ADUC845: FAQ
  • +ADuC847: FAQ
  • -ADUC848: FAQ
    • My customer has some technical problems/questions about ADuC848.
    • ADUC848: Configuration of current source IEXC[0|1]
    • ADUC848: Converting a small bipolar signal.
    • ADUC848: Is there a single device with supply range 2.7 to 5.5 V?
    • Aduc848: Verify in hardware that program has been succesfully load into chip
    • Which is the maximum value of the external clock  for the PWM on ADuc848?
  • +ADuC84x: FAQ
  • +ADUC8xx: FAQ
  • +ADUCXX: FAQ

My customer has some technical problems/questions about ADuC848.

Q 

My customer  has some technical problems/questions about ADuC848.

They used ADuC836 earlier but now trying to use ADuC848BS62-5. They save
content of the RAM (60 byte/ 15 page) at the EEPROM data memory when power
down. They
did not have any problem with ADuC836 but they can save only 20 byte / 5 page
using ADuC848. And, they need our help to solve the problem.

Please find some working informations below.

Supply voltage (DVdd, AVdd) : 5 Volts
Capacitor connected to power supply : 470 micro Farads
Only ADuC848 draws required currents, the others no.
PLLCON = 00000001B ( Core Clock = 6.29 MHz )
PSMCON = 11000001B ( DVdd, AVdd trip point = 4,63V )

FLASH/EE Data-Memory erased when power-on.

Only write operation done When PSM-INTERRUPT accepted.

 

A 

When the system supply is removed, the Power Supply Monitor (set to 4.63V)
triggers an interrupt which starts the subroutine to save the RAM values to
EEPROM data memory.

The difference between the ADuC848 and the ADuC836 in this regard is that the
ADuC848 comes in two voltage grades, 3V and 5V indicated by the -3 ro -5 at the
end of the part number.

The 5V part, which you are using, has a hardware power-on reset circuit whose
threshold is fixed at 4.63V.

Since the highest threshold for the power supply monitor is also 4.63V, the
Power supply Monitor function cannot be used with the 5V version of the ADuC848
- see page 68 of the ADuC848 datasheet. In fact the part will receive a
hardware reset at around the same voltage as the Power supply monitor is
triggered so there will be little or no time for any last minute processing to
take place.

A common solution, to receive advanced warning of a power down event, is to
obtain the interrupt signal from BEFORE the voltage regulator. Devices like our
ADM708 obtain a power fail signal from before the regulator and therefore give
you some extra time to store the RAM values into EEPROM.

  • aduc8xx
  • aduc8x
  • aduc848
  • 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.