I2C issue-Arduino UNO to dim the iw3690 via I2C according to analog voltage input

johnzhang2023 · December 22, 2023, 8:33am

Dear all,
I met an issue when running UNO, it can control the LED driver IC, but after a few minutes, the program stops, verytime this will happen either after recycling the power or re-programming.
can you give me some hint? many thanks.
................................................
void loop() {

//read Vdim and tranfer to digital value, Vdim-->output level,0x10 with 0-100
//UNO: 5 volts / 1024 units or, 0.0049 volts (4.9 mV) per unit.
int Vdim=analogRead(A0); //analog reading (which goes from 0 - 1023)
byte Vdim100=Vdim*(100.0/1023.0); //range:0-100
byte L1=Vdim100;
delay(2);

byte OutL=(L1+L0)/2; //byte L0=0 is defined earlier
delay(2);

byte OutL1=L1|0b10000000;//add bit7=1
// Serial.print("OutL1=");Serial.println(OutL1, BIN);
delay(2);

/// Only Vdim has variation(>=1%), change value of dimming register 0x10
if (abs(L1-L0)>=1)
{
//// dimming
Wire.beginTransmission(CHIP_ADDRESS);
Wire.write(REGISTER_ADDRESS); //0x10
Wire.write(OutL1);
Wire.endTransmission();
delay(5);
}
// else {}

//// Serial.print content of Register
Wire.beginTransmission(CHIP_ADDRESS);
Wire.write(REGISTER_ADDRESS); //0x10-outputlevel, 0x76-DimPhaseAngle,
byte RTN=Wire.endTransmission();
Wire.requestFrom(CHIP_ADDRESS,1);
delay(5);

byte OutLevel = Wire.read();
Serial.print("OutLevel, 0x10= ");Serial.println(OutLevel); // if Slave not connected, value is 255
Serial.print("RTN= ");Serial.println(RTN);

L0=L1;
delay(250); //500ms ini
}

gilshultz · December 22, 2023, 8:45am

Interesting problem but I cannot follow it. Please read the forum gujdelines and post your code according them using code tags. Post all of the code.
Guidelines: How to get the best out of this forum Also if there are hardware devices include links to there technical information and an annotated schematic showing how it is wired, be sure to include all power, grounds and power sources.

johnzhang2023 · December 22, 2023, 8:52am

#include <Wire.h>
#define CHIP_ADDRESS     0x38 //0x38
#define REGISTER_ADDRESS 0x10 //0x10 bit7-Control type,0-standalone,1-I2C; 0x10-bit6:0,Output level=0~100/99 
#define REGISTER_DP_ADDRESS 0x76 // Dimmer Phase: >88, no dimmer; <85, w/ dimmer
byte L0=0;
byte val=0;

void setup() {

Wire.begin(); // join i2c bus as a controller or a peripheral(address optional for master),initializes the Wire library
              //address: the 7-bit slave address (optional); if not specified, join the bus as a controller device.

//Wire.setClock(100000);//100KHz baseline,75kHz/10kHz can run, but also stops.

Serial.begin(9600);           // start serial for output

/// wakeup 
Wire.beginTransmission(CHIP_ADDRESS); 
Wire.endTransmission();
delay(2); //ms

/// Passkey
Wire.beginTransmission(CHIP_ADDRESS); 
Wire.write(0x42);  //0x42
Wire.write(0xA7); // 
Wire.endTransmission();
delay(2);
Wire.beginTransmission(CHIP_ADDRESS); 
Wire.write(0x42);  //0x42
Wire.write(0x65); // 
Wire.endTransmission();
delay(2);
Wire.beginTransmission(CHIP_ADDRESS); 
Wire.write(0x42);  //0x42
Wire.write(0x3F); // 
Wire.endTransmission();
delay(2);

/// 0x35=91
Wire.beginTransmission(CHIP_ADDRESS); 
Wire.write(0x35);  //
Wire.write(0x91); // 
Wire.endTransmission();
delay(2);
/// 0x19=80
Wire.beginTransmission(CHIP_ADDRESS); 
Wire.write(0x19);  //
Wire.write(0x80); // 
Wire.endTransmission();
delay(2);
/// 0x52=00
Wire.beginTransmission(CHIP_ADDRESS); 
Wire.write(0x52);  //
Wire.write(0x00); // 
Wire.endTransmission();
delay(2);
/// 0x3A=70
Wire.beginTransmission(CHIP_ADDRESS); 
Wire.write(0x3A);  //
Wire.write(0x70); // 
Wire.endTransmission();
delay(2);

/// No dimmer:Isnk set,0x3B=40
Wire.beginTransmission(CHIP_ADDRESS); 
Wire.write(0x3B);  //
Wire.write(0x40); // 
Wire.endTransmission();
delay(2);
/// No dimmer:Isnk set, 0x3D=0C
Wire.beginTransmission(CHIP_ADDRESS); 
Wire.write(0x3D);  //
Wire.write(0x0C); // 
Wire.endTransmission();
delay(2);

/// LightOutput: 0x10=64(=100,dec), next 0xFF
val=0x00|0b10000000; //val=0x64|0b10000000, new*@12.12
Serial.print("val= ");Serial.println(val, BIN);
Wire.beginTransmission(CHIP_ADDRESS); 
Wire.write(0x10);  //
Wire.write(val); // 
Wire.endTransmission();
delay(2);

//Serial.println(b, DEC); // print in decimal, same as above
//Serial.println(b, BIN); // print in binary
//Serial.println(b, HEX); // print in hexadecimal
}

void loop() {

//read Vdim and tranfer to digital value, Vdim-->output level,0x10 with 0-100
//UNO: 5 volts / 1024 units or, 0.0049 volts (4.9 mV) per unit.
int Vdim=analogRead(A0); //analog reading (which goes from 0 - 1023)
byte Vdim100=Vdim*(100.0/1023.0); //range:0-100
byte L1=Vdim100;
delay(2);
///*
byte OutL=(L1+L0)/2;
// Serial.print("OutL= ");Serial.println(OutL);
// Serial.print("L1= ");Serial.println(L1); 
// Serial.print("L0= ");Serial.println(L0); 
delay(2);
 

byte OutL1=L1|0b10000000;//add bit7=1
// Serial.print("OutL1=");Serial.println(OutL1, BIN); 
delay(2);

/// Only Vdim has variation(>=1%), change value of dimming register 0x10
if (abs(L1-L0)>=1)
{
//// dimming
Wire.beginTransmission(CHIP_ADDRESS); 
Wire.write(REGISTER_ADDRESS);  //0x10
Wire.write(OutL1); // byte=decimal(*)
Wire.endTransmission();
delay(5);
}
// else {}

//// Serial.print content of Register
Wire.beginTransmission(CHIP_ADDRESS);
Wire.write(REGISTER_ADDRESS); //0x10-outputlevel, 0x76-DimPhaseAngle,
byte RTN=Wire.endTransmission();//change to false,read ReTurN,12.20
Wire.requestFrom(CHIP_ADDRESS,1); //change to false,NG--12.20
delay(5);

//judge if it is a sucessful read
// while(Wire.available()) { //new 12.20
byte OutLevel = Wire.read();
Serial.print("OutLevel, 0x10= ");Serial.println(OutLevel); // if Slave not connected, value is 255
Serial.print("RTN= ");Serial.println(RTN);
// Serial.println(OutLevel,BIN);//Serial.println(OutLevelx,HEX);
// Serial.println("");
// }
L0=L1;

delay(250); 


}

Sorry, I just started to use the forum, not so familiar with the rule. I am not sure if it is the right way to insert code.
attach some slave IC information,

GolamMostafa · December 22, 2023, 9:53am

Try the following codes instead of the above:

int Vdim = analogRead(A0); //analog reading (which goes from 0 - 1023)
byte Vdim100 = map(Vdim, 0, 1023, 0, 100);
//byte Vdim100=Vdim*(100.0/1023.0); //range:0-100

johnzhang2023 · December 22, 2023, 1:42pm

Thanks@GolamMostafa,
I tried, but seems the problem still occurs.
I upload the I2C signal pictures before the programing stops for 3 cases, it seems I2C signal is abnormal. pls. note the above timing is abnormal while the below one in each picture is normal.

GolamMostafa · December 22, 2023, 1:56pm

Please explain, what are you trying to do with this chip (IW3690)? If possible, post a diagram (even hand drwan would be ok) of your project.

johnzhang2023 · December 22, 2023, 2:23pm

I want to dim or control the brightness of the LEDs through I2C by the analog voltage seen at UNO A0. UNO programing is used as a translation from analog voltage to the dimming or brightness level(0...100 for register 0x10 in iW3690) via I2C.

GolamMostafa · December 22, 2023, 4:40pm

Let me know few things wrt following diagarm (Fig-1) of your post #3.

Figure-1:

1. How much AC voltage across L and N terminals?
2. How much DC voltage across + and - terminals.
3. Is 3.3V coming from Host Controller (the UNO) or being produced by R3 voltage regulator?

4. Are you controlling the operation of U1 (IW3690) to regulate DC voltage across + and - terminals from Host Controller over I2C Bus?

5. What is function/need of U2 (CR1510)?
6. Have you built the sub-system of Fig-1? If yes, is it on the Breadboard or on the PCB?

7. Please, post/attch the detailed data sheets of the device.

johnzhang2023 · December 23, 2023, 3:47am

so much appreciated for your continuous focus.

AC voltage is 230Vac/50Hz.
DC Voltage is ~72V/120mA.
3V3 is from U3(LDO), generating 3v3 from 5V.
I try to control the operation of U1 (IW3690) to regulate DC current across + and - terminals(ie. LED current) from Host Controller over I2C Bus. if I send different output value to register(0x10), output current level of iw3690, the output LED current is hence changed.
U2 is high voltage buck, generating 5V from rectified AC mains.
no more sub-system except the UNO board with analog voltage input.
I tried, but new user has no right to upload document, so pls. tell me if you need more information.

GolamMostafa · December 23, 2023, 4:33am

I have a brief 7-page specification of the chip; but, I need full data sheets part of which I see in your post #3. You can post the link of the data sheets.

johnzhang2023 · December 23, 2023, 8:44am

I posted the I2C part below, as the remain part introducing other functions like phase cut dimmable.

I am afraid the information and introduction in the spec./datasheet is not so detailed, esp. for the firmware sequence/timing and overall registers. I got some information from a demo board and mimic the sequence of writing the registers to get the start-up of iw3690.
I can mail you the datasheet if you can leave email here, thanks.

TomGeorge · December 23, 2023, 9:37am

Hi, @johnzhang2023

Are you aware of how dangerous your schematic is with mains AC connected and no isolation for the UNO?

Can you please post some pictures of your project?
So we can see your component layout.

Can you please tell us your electronics, programming, arduino, hardware experience?

Thanks.. Tom...

GolamMostafa · December 23, 2023, 11:11am

Please, post the link of the data sheets.

johnzhang2023 · December 23, 2023, 12:25pm

@TomGeorge,
below is the schematic of iw3690 part, there is an isolated transformer btw. grid and mains input iw3690 driver board.

Yes, it is a non-isolated solution, but it shall work when UNO GND is connected primary side GND of iw3690 driver board.
sometimes, I powered UNO with 12V isolated adaptor power via the black connector on the UNO, and let UNO run alone. but if I2C logic waveforms are taken, I remove 12V adaptor and connect cable btw. notebook USB port and UNO series port(silver color connector on UNO).
When in running, I won't touch any of the device as it is non-isolated system.
I worked for power/SSL driver for more than 10 year.

johnzhang2023 · December 23, 2023, 12:35pm

Sorry, I wasn't allowed to post the file at the moment.

GolamMostafa · December 24, 2023, 3:37am

My email is sent to your personal message box where you can send the data sheets of IW3690.

It looks like that there is a temperature sensor inside the IW3690 device. Can you read the temperature to verify that the UNO has access to the device?

TomGeorge · December 24, 2023, 11:40am

Hi,
That is not an isolation transformer.
Where is the 300V coming from?

I am stressing this, because I want you to come back here with questions or answers.

Tom...

GolamMostafa · December 24, 2023, 1:14pm

What do you expect from IW3690 (what kind of output and at what pin) after the execution of the sketch of post #3?

johnzhang2023 · December 24, 2023, 1:54pm

@ TomGeorge,
I explain your 2 questions below,

isolated transformer(①) is put btw. grid and mains input iw3690 driver, but just for isolated purpose, as the voltage on the driver is quite high, so it is still not safe for manual touch, sufficient carefulness shall be paid anyway. like using insulated plastic screwdriver to change the analog voltage on Arduino A0 pin.
300V of the circuit you post is from "HV node"(②) of the LED driver iw3690, HV node is more accurate, value 300V is around 230V*1.414.

image1237×637 117 KB

TomGeorge · December 24, 2023, 2:19pm

Thankyou, a complete and concise schematic explains it all.

Merry Christmas... Tom...

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I2C issue-Arduino UNO to dim the iw3690 via I2C according to analog voltage input

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