Frédéric Blanc » I2C Inter-Integrated Circuit

h1. Wiki

{{toc}}

h2. USB <-> I2C

h3. SiLabs CP2112

!clipboard-202411051457-ujwet.png!

Passerelle USB-I2C SiLabs CP2112

h3. Arduino

<pre><code class="cpp">

#include <Arduino.h>

#include <Wire.h>

void setup(){

    Wire.begin();    

    Serial.begin(9600);

} 

void loop(){

    byte error, address;

    int nDevices;

    Serial.println("Scanning...");

    nDevices = 0;

    for(address = 8; address < 127; 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("Unknow 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);

}

</code></pre>

https://arduino-france.site/i2c-scanner/

h3. Commande Linux

h4. i2c-tools

<pre><code class="shell">

sudo apt install i2c-tools

</code></pre>

h5. i2cdetect

<pre><code class="shell">

i2cdetect -l

</code></pre>

!clipboard-202411051520-zo9bt.png!

<pre><code class="shell">

sudo i2cdetect -r -y N

</code></pre>

N numero I2C ici 5

!clipboard-202411081354-28b9g.png!

détection de puces I2C, TCA9535 0x20, ADS1115 0x48, PCF8563 0x51

h5. i2cget

<pre><code class="shell">

sudo i2cget 5 0x20 0x04

</code></pre>

!clipboard-202411081405-bcbfj.png!

lecture dans le TCA9535 0x20, dans le registre 0x4

h5. i2cset

<pre><code class="shell">

sudo i2cset 5 0x20 0x02 0x01

</code></pre>

!clipboard-202411081403-zlizw.png!

écriture dans le TCA9535 0x20, dans le registre 0x2, les bits 0b00000001

https://www.acmesystems.it/i2c

https://www.youtube.com/watch?v=QwlqOTDAPfk

h2. Composants

h3. PCF8563 Real-time clock/calendar

!clipboard-202411071057-aw2q3.png!

VDD = 1.8 V to 5.5 V

400-kHz Fast I2C bus

*@I2C 0x51*

document#245

h3. TCA9535 I/O Expander 16-Bit

Low-Voltage 16-Bit I2C and SMBus Low-Power I/O Expander with Interrupt Output and Configuration Registers,

!clipboard-202411071059-exmd3.png!

VDD 1.65 V to 5 V

400-kHz Fast I2C bus.

*@I2C*

!clipboard-202411071120-iho0j.png!

document#243

h3. ADS1115 Quad ADCs

16-bit, 860-SPS, 4-channel, delta-sigma ADC with PGA, oscillator, VREF, comparator and I2C

!clipboard-202411071414-qcbtd.png!

VDD 2.0 V to 5.5 V

*@I2C*

|0x48|0b1001000|GND|

|0x49|0b1001001|VDD|

|0x48|0b1001010|SDA|

|0x49|0b1001011|SCL|

document#242

h3. LTC2635 Quad DACs

Quad 12-/10-/8-Bit I2C VOUT

DACs with 10ppm/°C Reference

!clipboard-202411081042-w1dol.png!

VDD 2.7V to 5.5V

*@I2C*

|0x10|0b0010000|GND|

|0x11|0b0010001|NC|

|0x12|0b0010010|VDD|

document#244

h3. IP5306 Battery Management System

Fully-Integrated Power Bank System-On-Chip with 2.1A charger, 2.4A discharger

!clipboard-202411081112-fltgj.png!

*@I2C 0x75*

document#246

h3. 24LC512 EEPROM 512Kbit

!clipboard-202411081325-eulk2.png!

VDD 2.5-5.5V

400-kHz Fast I2C bus

*@I2C*

|||A2|A1|A0|

|0x50|0b1010000|GND|GND|GND|

|0x51|0b1010001|GND|GND|VCC|

|0x52|0b1010010|GND|VCC|GND|

|0x53|0b1010000|GND|VCC|VCC|

|0x54|0b1010100|VCC|GND|GND|

|0x55|0b1010101|VCC|GND|VCC|

|0x54|0b1010110|VCC|VCC|GND|

|0x55|0b1010111|VCC|VCC|VCC|

document#247