Pin connection for i2c communication with BQ25622

Projects General Guidance
1

can any one help me to interface BQ25622 with arduino uno which pin used from BQ25622 where to connect.

2

Default I2C pins...
SDA / A4
SCL / A5

4

Hi,
Looking at your other thread.
What controller do you really want to use UNO or ESP32?

Lets use one thread for your project.

Tom.... :smiley: :+1: :coffee: :australia:

5

sure , lets first confirm with arduino uno then i will port in esp32 my own

6

hello @kmin and others here in below i attach my hardware design can u confirm it any extra pin except the sda and scl need to be used then inform me please.

image (7)
image (7)1077×449 102 KB

7

Hi,
Where in your schematic is the UNO?

I'm glad you put current limit resistors in the status LEDs, the datasheet just shows an N-CH MOSFET in the IC to GND, the suggested circuit doesn't have any resistors.

Tom.... :smiley: :+1: :coffee: :australia:

8

GND for sure.
Maybe you wish to use some others as well. The datasheet has good description of features.

9

Hi,
This will help.

image
image897×640 7.39 KB

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

Tom.... :smiley: :+1: :coffee: :australia:

10

hello @TomGeorge , i already connected sda and scl by 10kohm pullup i try to run scanning code but my ic(BQ25622) not detected.

#include <Wire.h>
void setup()
{
  Wire.begin();
  Serial.begin(115200);
  while (!Serial);  
}
void loop()
{
  byte error, address;
  int nDevices;
  Serial.println("Scanning...");
  nDevices = 0;
  for(address = 1; address < 127; address++ ) 
  {
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    Wire.beginTransmission(address);
    error = Wire.endTransmission();

    if (error == 0)
    {
      Serial.print("I2C device found at address 0x");
      if (address<16) 
        Serial.print("0");
      Serial.print(address,HEX);
      Serial.println("  !");

      nDevices++;
    }
    else if (error==4) 
    {
      Serial.print("Unknown error at address 0x");
      if (address<16) 
        Serial.print("0");
      Serial.println(address,HEX);
    }    
  }
  if (nDevices == 0)
    Serial.println("No I2C devices found\n");
  else
    Serial.println("done\n");
  delay(5000);           // wait 5 seconds for next scan
}


output :
<
Scanning...
No I2C devices found

Scanning...
No I2C devices found

Scanning...
No I2C devices found
>
11

Hi,
What controller are you using?
If its a UNO, then use 4K7 pullups to 5V.

Is the 25622 powered up?

Tom.... :smiley: :+1: :coffee: :australia:

12

Are you using the Arduino UNO?
Are the I2C pins of the BQ25622 5-V tolerant?