PCA9846PW 4-Channel Switch

By NXP Semiconductors 56

PCA9846PW 4-Channel Switch

NXP's PCA9846 is an ultra-low-voltage, quad bidirectional translating switch controlled via the I2C bus. The SCL/SDA upstream pair fans out to four downstream pairs or channels. Any or all SCx/SDx channels can be selected, determined by the programmable control register. This feature allows multiple devices with the same I2C bus address to reside on the same bus. The switch device can also separate a heavily loaded I2C-bus into separate bus segments, eliminating the need for a bus buffer.

Features and Benefits
  • Ultra-low-voltage operation, down to 0.8 V to interface with next-generation CPUs
  • One-of-four bidirectional translating switch
  • Fast -mode Plus (Fm+) I2C bus interface logic; compatible with SMBus standards
  • Two address pins allowing up to 16 devices on the I2C bus
  • Channel selection via I2C bus
  • Power-up with all switch channels deselected
  • Low RON switches
  • Allows voltage level translation between 0.8 V, 1.8 V, 2.5 V, and 3.3 V buses
  • Reset via I2C bus software command
  • I2C Device ID function
  • No glitch on power-up
  • Supports hot insertion since all channels are de-selected at power-on
  • Low standby current
  • 3.6 V tolerant inputs
  • 0 Hz to 1 MHz clock frequency
  • ESD protection exceeds 6000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101
  • Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
Applications
  • Computing: I2C bus isolation in larger server platforms
  • Industrial: enabling multiple slaves with the same I2C address
  • Commercial: obscuring I2C slaves for direct detection
  • Automotive: protecting sensitive I2C master devices from overstress damage

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