DigitalDeath
Junior Member level 1
Hello everyone,
This AD5142 IC has me stumped. I have tried every combination I can come up with and there is nothing I can do to make it work.
Here's the schematic:
Here's the actual layout with the programming probe pads with the corresponding microcontroller controller terminals:
Here are the signals being sent for writting a 1 to pot 0:
I have tried floating -INDEP, connecting to to ground and to +5V. I have tried all 4 modes of SPI_MODE0 to SPI_MODE3
Here's a sample of a simple program I've tried:
This code on SPI mode 0 works perfectly fine on an AD5204 that used raising edge clock from the same family.
Here's a link to the 5142 Datasheet.
And here's the pinout:
When turned on the wiper starts in the middle of the pot range as expected by default from factory but I can't get it to respond in any way.
I made a circuit with only the IC and no luck, I even soldered small wires to each pin to the IC by itself to make sure the connections were correct but no luck.
I tried the code with another IC from the same family and it worked perfectly fine.
This code on SPI mode 0 works fine on an AD5204 that uses raising edge clock from the same family.
I know it'll be some tiny little detail I forgot or missed that will make it work but I'm stumped right now.
Any help will be appreciated.
This AD5142 IC has me stumped. I have tried every combination I can come up with and there is nothing I can do to make it work.
Here's the schematic:
Here's the actual layout with the programming probe pads with the corresponding microcontroller controller terminals:
Here are the signals being sent for writting a 1 to pot 0:
I have tried floating -INDEP, connecting to to ground and to +5V. I have tried all 4 modes of SPI_MODE0 to SPI_MODE3
Here's a sample of a simple program I've tried:
Code:
#include <SPI.h>
void setup() {
// pin 10 is the slave select for the digital pot
pinMode( SS, OUTPUT); // set the slaveSelectPin as an output
digitalWrite(SS, HIGH); // take the SS pin high to de-select the chip
// MISO input needs to be ;ulled up for the AD5142
pinMode( MISO, INPUT_PULLUP);
SPI.begin(); // initialize SPI
// set SPI speed to 500 kHertz, MSB, NORMAL LOW CLK and FALLING EDGE
SPI.beginTransaction (SPISettings (500000, MSBFIRST, SPI_MODE1));
// make sure the control register is correct:
digitalWrite(SS, LOW);// take the SS pin low to select the chip
SPI.transfer(0b11010000); // Copy serial register data to control register command 16
SPI.transfer(0b00000011); // D2= 0 = potentiometer mode, D1=1 = enables EEPROM programing, D0=1 = allow update of wiper position
digitalWrite(SS, HIGH); // take the SS pin high to de-select the chip
}
void loop() {
writeOne();
delay(10);
}
void writeOne(){
digitalWrite(SS, LOW);// take the SS pin low to select the chip
SPI.transfer(0b00010000); // command 1= set pot, pot selected= 0
SPI.transfer(0b00000001); // pot value= 1
digitalWrite(SS, HIGH); // take the SS pin high to de-select the chip
}This code on SPI mode 0 works perfectly fine on an AD5204 that used raising edge clock from the same family.
Here's a link to the 5142 Datasheet.
And here's the pinout:
When turned on the wiper starts in the middle of the pot range as expected by default from factory but I can't get it to respond in any way.
I made a circuit with only the IC and no luck, I even soldered small wires to each pin to the IC by itself to make sure the connections were correct but no luck.
I tried the code with another IC from the same family and it worked perfectly fine.
This code on SPI mode 0 works fine on an AD5204 that uses raising edge clock from the same family.
I know it'll be some tiny little detail I forgot or missed that will make it work but I'm stumped right now.
Any help will be appreciated.
