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Quick Links Categories Recent Discussions. But I also have some questions and problems to resolve in getting other commands to function properly and getting multiple commands to work together. I built a programmer board for this chip and have successfully stored and played various sound messages using the push buttons in isd11740 mode.

I have also used stand-alone mode under control datasheeg the SX28 controlling the button inputs. But my real need is to become fluent with each command in SPI mode. SPI mode offers seamless transitions between sound messages using a buffer which is the feature I require in my application. When the current sound completed, the other ISD picked up seamlessly. I have searched the SX forum and the web in general with no hits on this subject.

But for some datasjeet, I have difficulty putting commands together single-stepping to observe register results. When I put them together the expected results fail.

Thanking you for having read this far…and hoping you might be further up the trail. SRC SX forum code Comments 26 Comments sorted by Date Added Votes. I found my problem as to why I could osd1740 execute one ISD command after another. But it did take the effort to write and post my initial forum submission.

Almost like reading a quote from my posting! That thought led me to consider the SS line, the Slave Select signal. I do have to say, however, that there is a case that kept me from understanding this long ago. This one still confuses me. Datashfet can now step through all the commands I have worked with, one after another, and all MISO data reports correctly.

I extend my apologies to those who may datashet labored through my post. However, as I said, I feel it was fundamental to catching my misunderstanding. I can now datasehet for the night and finally sleep – instead of counting bits and bytes! Hello, I was wondering how you built your interface.

Is there a schematic available. I’m trying my own little prodject and I want good quality sound. This should have everything you need to make it work plus a little extra. You just need to add the new commands for your chip.

ISD1700 Series ChipCorder

Looks like it has a few different commands, but the rest appears to work the same. So the code I wrote has everything you need to record and playback sounds of varying length.


I, too, have been experimenting with the ISD series. I’ve attached a WIP program that may help you get connected. I have been “out” for a while and have not seen your request. Below are links that I found helpful. The second one is the actual 17 page document with photos and schematic for a programmer.

I laid out my components for a PCB in a different manner than the photo shows. There is no PCB artwork in this doc. I wanted to get my bypass caps closer to the power pins than what I saw in the photo. However, it probably is not necessary to build one.

All I do now is use the ISD on a bread board and activate the pins directly if I want to use push-button control. The pins have built-in pull-up resisters. I have not been too happy with the volume level from the chip.

Note that the chip has an eight level stepping volume control. I have not been able to get back to working on the audio level aspect and hope that I might be doing something wrong and the chip will perform better when I datashewt better acquainted with it. I would like to hear from anyone who uses this chip and has had satisfactory experience with the audio volume. After a long delay I am back working with the ISD17xxx series and finally having some luck.

What’s odd — for my application, anyway — is that you cannot write the Play Pointer directly. In my app I want to play one of N segments that are stored in the device without knowing the specific address of that segment.

I’ve attached my latest “lab” code; it seems to work as I intended.

Hello, Am working on my senior project and am having a hard time figuring out how to control the ISD This is in response to a PM that came to me recently and I thought it would be better handled in the forum.

Basically, the question was asked as to how to start to learn to program the ISD series devices. Here are my thoughts based on my personal experience last year. I have been away from the chip for a year, so this has been a good review for me as I now have to get back to this aspect of my project. Seriously, have a copy by your computer, by your bed, and in the bathroom. This is as basic a plan as can be given. If you skip this you are on your own. This is not the easiest chip to learn.

These will be handy to have right next to as you will be thumbing through the rest of the manual all the time while still referring to these pages. As you write code and debug, keep rereading these rules. Highlight the key question in each rule so you can easily and quickly scan over them as you debug.


They are a checklist. You will do well also. I did make a programmer that worked successfully, but felt that I did not really have to do so. I ended up just using my design board for both standalone mode and SPI mode.

What I highly recommend: I’m from the old school.

I programmed assembly language and machine language back in the sixties just after we got radio and heard about TV. I like to see the bits — every one of them! When they are there…and when they are not there. You will be comparing your results with the timing diagrams in section Some are error indicators. Some let you know that everything went well or is normal. I put all my manual in a three ring binder with section ied1740.

This made referencing very easy. All the extra copies of special pages I had right before me or posted on a board in EASY reading distance.

If you can not retrieve the Device ID, well, keep trying. This was my journey into the ISD series.

CCS :: View topic – Spi comm with ISD

Hope datashewt will share their thoughts and that this has been a help to someone else. Thank you so much. But it seem really hard to use this dahasheet. Anyway, I will try my best and look at datashete datasheet again, again and again.

But for step 6, we need to design our own board? At first I thought we can just apply the circuit given in datasheet section 15 typical application circuit except the programming part. As for the section 7 in datasheet analog path configuration, actually is it related dwtasheet SPI? How to configure it? I just feel like it is something extra and don’t know what is it. You do not have to build a programmer. It was just easier for me to datasheeet the standalone mode first, then the SPI mode with the assembly programming of the SX I also wanted to pay close attention to the power routing on my PCB for the separate analog and digital power pins and their respective bypass caps.

Building the programmer gave me a chance to check out my design. As far as the analog paths: You can go with the default settings unless there is something in your design that dictates otherwise. Take note of the speaker output choices and the vol control bits D0-D2 in the APC register page 17 – Hope this helps some. It is a challenging chip. But we need to get better acquainted with sound for the SX. Dear Thomas, Thank you so much.

Get what you mean.