![]() The DAC8531 is available in both MSOP-8 and 3x3 SON-8 (same size as QFN) packages. The power consumption is 2mW at 5V reducing to 1 µW in power-down mode. The low power consumption of this part in normal operation makes it ideally suited to portable battery-operated equipment. The DAC8531 contains a power-down feature, accessed over the serial interface, that reduces the current consumption of the device to 200nA at 5V. The DAC8531 incorporates a power-on reset circuit that ensures that the DAC output powers up at 0V and remains there until a valid write takes place to the device. The DAC8531 requires an external reference voltage to set the output range of the DAC. The DAC8531 uses a versatile three-wire serial interface that operates at clock rates up to 30MHz and is compatible with standard SPI, QSPI, Microwire, and Digital Signal Processor (DSP) interfaces. Its on-chip precision output amplifier allows rail-to-rail output swing to be achieved. The DAC8531 is a low-power, single, 16-bit buffered voltage output Digital-to-Analog Converter (DAC). PACKAGES: MSOP-8 and 3x3 SON-8 (same size as QFN)Īll trademarks are the property of their respective owners.ON-CHIP OUTPUT BUFFER AMPLIFIER, RAIL-TO-RAIL OPERATION.LOW-POWER SERIAL INTERFACE WITH SCHMITT-TRIGGERED INPUTS.Force sensor reading 0 -> no pressure Force sensor reading 0 -> no pressure Force sensor reading 132 -> light touch Force sensor reading 147 -> light touch Force sensor reading 394 -> light squeeze Force. Obviously not the fastest as I was still using digitalWrite, haha. Click Upload button on Arduino IDE to upload code to Arduino. * write to the MCP4922 channel 0 or 1, int value will be masked */ simplest fastest MCP4922 testĭacWrite(0, cUp) // channel B will be skewed! measure it. I don't typically leave sketches around that don't function. I suggest you build a small circuit on a breadbox or otherwise and get the simplest thing working. I would rather strukkle with my own code than figure out someone's library. Evidently I knew more about SPI at the moment and just rolled my own interface to the DAC.īTW last time I used SPI I did not use the SPI library. I should say I have experimented with it and deployed it in local noncritical projects. I poked around because I have used some MCP49X variant. ( Sorry, just working towards my "thumb's up" badge, 99 to go, but sincere) Here is a screen capture from the MPX and photo from the PCB. I've searched around the new and at some posts there was a mention that SPI codes/libraries that are ment for UNO wouldn't work with Mega due that the MOSI, SCK and SPI SS are on the different pins and those would need to be addressed with software SPI in some cases. I just can't figure out what I'm doing wrong since the very simple DAC library code won't work. Now I know that the MCP4921 is active on LOW so I have to make some fixes but those I can handle. I made a mistake thinking that the DAC is active on HIGH CS signal so I could easily feed it to dacs with MPX. ![]() I've build Analog Polysynth voice pcb's and other synth clones for the past 10 years and I thought I can handle this But I have to say, I'm more familiar with the analog world than with the digital hardware and coding, so this I'm just learning butI thought I can get the Dacs to work.ĭAC's are driven by 4051 multiplexer that feeds the CS signal from arduino. Hi alto777 and thank you for the comments Is there something with the Arduino Megas default SPI pins that it won't correspond to the MCP492x library settings? (I put the delays to make the measuring easier). And the voltages at DAC pin 4 (MOSI 51) and DAC pin 3 (SCK 52) show swing between 0-40 mV. I dont have a scope but I measured with multimeter that the DAC pin 2 (from pin 53 SS) is at 4,97V and swinging. ( GitHub - michd/Arduino-MCP492X: MCP4921/MCP4922 Digital to analog converter Arduino library, using SPI.h library)Īnd I've put the following lines to my code but it won't work:Īnd in the program code: myDac.analogWrite(2048) I've mostly noodled with the MCP492x library : I've hardwired the MCP4921 DACs to Arduinos MOSI (51), SCK (52) and (SPI)SS (53) and I've tried several Arduino MCP4921 libraries but the result is the same. I have eight MCP421 DACs on the board and thought these are a cakewalk with libraries and all but no. Everything else on the circuitry works but I'm stuck with the most annoying part. My ambitious project is to build Midi to CV for 8 voices and I've drawn the schematics, got the PCB and it's now populated. I'm new to the Forum but a long time user of Arduino and I've been here on the site many times for troubleshooting my code with your help.
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