Single Channel Fm+ I²C-bus Repeater with PCA9618UK

PCA9618 Functional Diagram

PCA9618 Functional Diagram

As a single channel Fm+ I2C-bus repeater, this PCA9618UK device provides Fast-mode Plus (Fm+) I2C-bus or SMBus buffering of either the SCL or SDA line or can be used in any single bit applications that require buffering. While retaining all the operating modes and features of the I²C-bus system, it also permits extension of the I²C-bus by providing bidirectional buffering, thus enabling buses of 540 pF at 1 MHz or up to 4000 pF at lower speeds. Using the PCA9618 enables the system designer to isolate two halves of a bus for capacitance. The DATAA and DATAB pins are overvoltage tolerant and are high-impedance when the PCA9618 is unpowered.

Why Used

  • Operating supply voltage range of 2.2 V to 5.5 V
  • Data pins are 5 V tolerant, allowing voltage translation applications
  • 0 Hz to 1000 kHz clock frequency (the maximum system operating frequency may be less than 1000 kHz because of the delays added by the repeater)
  • 1 channel, bidirectional buffer isolates capacitance and allows 540 pF on either side of the device at 1 MHz and up to 4000 pF at lower speeds
  • Open-drain input/outputs

Where Used

  • Automotive

Read more