Embedded Systems Conference
Breaking News
Comments
Max The Magnificent
User Rank
Author
Is that a WOM in your pocket (or are you just pleased to see me)?
Max The Magnificent   1/31/2014 9:42:15 AM
NO RATINGS
@Antedeluvian: Thanks for this blog -- I must admit that I'd never thought of doing this, by which I mean reading back from the display to make sure it was up and running (or in your case just monitoring the BF signal).

I'm not sure if my Adafruit display supports reading back -- I'll have to check -- but I'll certainly incorporate some tests based on your blog into any future equipment I design involving displays.

 

 

elizabethsimon
User Rank
Author
Re: Is that a WOM in your pocket (or are you just pleased to see me)?
elizabethsimon   2/3/2014 12:42:38 PM
NO RATINGS
It's a good chance that the Adafruit display supports readback. In my experience with this type of display, they are almost always HD44780 types (even if they use a"newer" chip made by a different vendor).


In my day job, I work on products that need to be very reliable. A few years ago, I was assigned to qualify some new LCD displays because the driver IC had changed. I discovered that in some of our older products the new displays had a tendency to go blank when zapped with ESD. The vendor was able to fix the problem with better shielding and a different IC but it would have saved a lot of trouble if the firmware guys back then had used a periodic readback to check the health of the display...

 

David Ashton
User Rank
Author
Vagaries of displays
David Ashton   1/31/2014 5:48:51 PM
NO RATINGS
Aubrey... "Am I being overly cautious?" 

Depends.  If the display is for an LCR meter (for example) then yes, if it does not work the operator can just power it off and on.  But if it is used in a piece of medical equipment, or a critical process control application, then these techniques are very good to know.   Thanks as always for an informative article.

I recently got some BIIIIG vacuum fluorescent 4 x 20 character displays which I described in my recent article here.  I thought they'd be standard HD44780 types - NOT!  Very strange things - most control codes were actually input as text but in the 00h-20h range (much like the old printers).  They DID have a control line but it was only used for a couple of things - resetting the display for example.  But they are lovely displays.  Useful for impressing Veeps, amongst other things :-)

antedeluvian
User Rank
Author
Most popluar 4 bit micro
antedeluvian   1/31/2014 6:10:53 PM
NO RATINGS
I often see discussions of the most popular computer architecture- 8 bits/16 and 32 bits, but I don't ever recall seeing ann passion being expended on 4 bit devices. My bet would be for the HD44780 just based on the time it has been available and the sheer number of displays that have been produced.



Top Comments of the Week
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Awesome 3D Electronic Sculptures
Max Maxfield
10 comments
I recently received an email from someone we'll call Martin (because that's his name). Martin's message was short and sweet. In its entirety it read: "You need to see this!"

Jack Ganssle, Embedded.com

Processor Pinups
Jack Ganssle, Embedded.com
4 comments
My wife and I joke about our “adult” magazines. For her, those are the publications about beading. For me, they’re tool catalogs and Fine Woodworking magazine. The latter ...

Rajaram Regupathy, Cypress Semiconductor

Add USB Battery Charging Protocols to an Android-Based Design
Rajaram Regupathy, Cypress Semiconductor
Post a comment
Editorial Note: Excerpted from Unboxing Android: A hands on approach with real world examples, by Rajaram Regupathy, the author takes you through the process incorporating effective power ...

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
16 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Doug Bailey, VP of marketing at Power Integrations, gives a ...
See how to ease software bring-up with DesignWare IP ...
DesignWare IP Prototyping Kits enable fast software ...
This video explores the LT3086, a new member of our LDO+ ...
In today’s modern electronic systems, the need for power ...
Radio
LATEST ARCHIVED BROADCAST
EE Times Senior Technical Editor Martin Rowe will interview EMC engineer Kenneth Wyatt.
Flash Poll