Product description: ISO1640 - Bidirectional I2C Isolator Without Connectors - 3 - 5.5 V / 2.25 - 5.5 V - Pololu 5390
The Pololu I2C Isolator is a compact module based on the TI ISO1640 system, which enables electrically isolated I2C communication at speeds up to 1.7 MHz . Galvanic isolation prevents current flow between the two sides of the module, protecting connected devices from damage caused by potential differences or improper power supply. The module is available in a version without connectors , with mounting holes compatible with universal contact boards and goldpin connectors with a pitch of 2.54 mm. It is ideally suited for applications requiring reliable I2C bus protection and ensuring stable communication in embedded systems and automation.
ISO1640 - bidirectional I2C isolator without connectors - 3 - 5.5 V / 2.25 - 5.5 V - Pololu 5390.
The module enables bidirectional I2C communication.
Main features of the insulator
- Bidirectional galvanic isolation : ensures safety and electrical independence between devices
- Voltage Compatibility : Side 1 3V to 5.5V, Side 2 2.25V to 5.5V
- Full bidirectionality of SDA and SCL lines : supports clock stretching and standard I2C functions
- Transmission frequency : up to 1.7 MHz according to ISO1640B
- Mounting and connections : 0.1'' (2.54 mm) holes for installation on breadboards or with goldpin connectors
- Device protection : protection against damage caused by incorrect connections and potential differences
- Small dimensions and low weight : 10.2 x 15.2 x 2.8 mm and 0.4 g
Module pins
The module has solder holes spaced every 0.1'' (2.54 mm) allowing for connection using standard goldpin connectors or soldering wires directly. Side 1 of the module ( VCC1, GND1, SDA1, SCL1 ) and side 2 ( VCC2, GND2, SDA2, SCL2 ) are electrically independent and require a separate power supply. The pins allow easy connection to any I2C devices on both sides of the isolator.
Module pins.
The isolator has no built-in connectors.
Connection and configuration
For the module to operate correctly, each side must be powered independently: side 1 with a voltage of 3 V to 5.5 V, side 2 with a voltage of 2.25 V to 5.5 V. The SDA and SCL lines must be connected to both devices, remembering to maintain the separation of GND1 and GND2 grounds - they must not be connected directly , as the module provides galvanic isolation. The built-in 10 kΩ pull-up resistors on both sides ensure correct operation of the bus, however, for high communication speeds, external pull-up resistors can be used in parallel.
Technical specification of the insulator
- Chip: TI ISO1640B
- Side 1 Supply Voltage Range: 3 V to 5.5 V
- Side 2 Supply Voltage Range: 2.25 V to 5.5 V
- Maximum transmission frequency: 1.7 MHz
- Connectors: solder holes with 0.1'' (2.54 mm) pitch
- Dimensions: 10.2 x 15.2 x 2.8 mm
- Weight: 0.4 g
Kit Contents
- 1x ISO1640 - Bidirectional I2C Isolator Without Connectors - 3 - 5.5 V / 2.25 - 5.5 V - Pololu 5390
The module has small dimensions, making it suitable for many projects.
