I2C Isolator 5 Click Board™

Product Code: MIKROE-5725

How Does The I2C Isolator 5 Click Board™ Work? The I2C Isolator 5 Click Board™ is based on the ISO1644, a hot-swappable bidirectional I2C isolator with enhanced EMC and GPIOs from Texas Instruments. The ISO1644 bidirectionally buffers the two I2C signals across the isolation barrier while providing 5kVRMS of galvanic isolation. The isolation barrier comprises a double capacitive silicon dioxide and includes basic and reinforced insulation devices. In addition, the ISO1644 also integrates three unidirectional CMOS isolation channels with up to 50Mbps speed, which can be used for static GPIO signal isolation. It also integrates the logic required to support bidirectional channels. ISO1644 supports I2C 2-Wire bidirectional data transfer between a host device and several peripheral devices, where the host MCU controls the bus, specifically the serial clock (SCL) line. The data transfer can be made in standard, fast, fast-mode plus, and high-speed mode, up to 3.4Mbps. As for three GPIO lines, the ISO1644 consists of two lines in one direction and one in the opposite direction.

It could be used for any GPIO purpose. This Click board™ poses a terminal with isolated SCL and SDA lines. Besides, the terminal consists of VCC and GND lines and OUTA, OUTB, and INA, labelling the direction of the lines. Those GPIO lines are connected to the mikroBUS™ socket, thus the host MCU, via OTA, OTB, and INA pins. You can pull up the isolated I2C lines via unpopulated R6 and R7 jumpers if that suit your needs. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development. SPECIFICATIONS Type I2C,Isolators Applications It can be used for transferring digital signals between circuits with different power domains at ambient temperatures On-board modules ISO1644 - a hot-swappable bidirectional I2C isolator with enhanced EMC and GPIOs from Texas Instruments Key Features Robust galvanic isolation of digital signals withstands 5kVRMS, low power consumption, supports four I2C speeds, three additional GPIO lines ideal for isolation and glitch-free operation, excellent reliability, long operational life, and more Interface GPIO, I2C Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 3.3V or 5V PINOUT DIAGRAM This table shows how the pinout of the I2C Isolator 5 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes NC 1 AN PWM 16 OTA Output A Channel Output B Channel OTB 2 RST INT 15 INT Input A Channel Chip Select CS 3 CS RX 14 NC NC 4 SCK TX 13 NC NC 5 MISO SCL 12 SCL I2C Clock NC 6 MOSI SDA 11 SDA I2C Data Power Supply 3.3V 7 3.3V 5V 10 5V Power Supply Ground GND 8 GND GND 9 GND Ground ONBOARD SETTINGS AND INDICATORS Label Name Default Description LD1 PWR - Power LED Indicator JP1 VCC SEL Left Logic Voltage Level Selection 3V3/5V: Left position 3V3, Right position 5V R6 R6 Unpopulated Isolated SCL Line Pull Up Resistor R7 R7 Unpopulated Isolated SDA Line Pull Up Resistor I2C ISOLATOR 5 CLICK ELECTRICAL SPECIFICATIONS Descript