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The RoHS icon on this product indicates that the PCBs, components, solder, and chemicals are all lead-free and RoHS compliant. Additionally, this product is produced using a lead-free process. Unfortunately, we are currently unable to provide documentation confirming that this product is RoHS compliant.
Package Includes:
Notes:
- This board uses 4-pin connectors for I2C bus.
Resources:
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Features:
- PCF8574 I2C bus chips
- 100kHz I2C bus frequency
- Selectable I2C bus pulling-up resistors
- Address by 3 jumpers for use of up to 8 addresses
- Up to 16 boards on a single bus
- Compatible with most microcontrollers
- Supports 2.5 to 5.5V microcontroller ports
- 8 relay outputs
- Supports 5Vdc coil voltages
- Relay contact rating 0.5A @120Vac, 1A @30Vdc, 0.15A @48Vdc
- I2C operating voltage: 2.5Vdc to 5.5Vdc
- On-board reverse polarity protection circuits
- Small PCB size: 81.6x36.1mm
This is an I2C relay board, designed as a remote relay board for the I2C bus, making it an ideal solution for relay output expansion in small spaces. The key features of this board are:
Based on PCF8574, which allows communication via I2C for controlling relays remotely.
Compatible with up to 16 boards on a single I2C bus, as each PCF8574 or PCF8574A board can connect up to 8 boards, enabling scalable expansion.
100kHz bus frequency support ensures smooth and stable data transmission over the I2C bus.
Selectable I2C bus pulling-up resistors for SDA and SCL signals for improved signal integrity.
Eight small relays, offering flexible control for various devices, with selectable coil input voltage from either bus or external voltage.
Reverse polarity protection circuits to safeguard the board from incorrect power supply connections.
Double 4-pin bus connectors make connecting the I2C bus easier compared to previous versions.
LED indicator that turns on when the input voltage is applied to the board, offering easy status monitoring.
Mounting holes are compatible with previous versions like EI2C-9AI and EI2C-9AIA, ensuring compatibility with older designs.
Important safety note: To prevent damage to the board, do not plug or unplug I2C cables while the power supply is still on. Always turn off the power supply before connecting or disconnecting the I2C cables.
