PCA9847PWJ Datasheet, PDF (1/31 Pages) NXP Semiconductors – 8-channel ultra-low voltage, Fm+ I2C-bus multiplexer with reset

PCA9847
8-channel ultra-low voltage, Fm+ I²C-bus multiplexer with
reset
Rev. 1 — 9 November 2015
Product data sheet
1. General description
The PCA9847 is an ultra-low voltage, octal bidirectional translating multiplexer controlled
via the I²C-bus. The SCL/SDA upstream pair fans out to eight downstream pairs, or
channels. Any single SCx/SDx channel 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 multiplexer device can also separate a heavily
loaded I²C-bus into separate bus segments, eliminating the need for a bus buffer.
An active LOW reset input allows the PCA9847 to recover from a situation where one of
the downstream I²C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets
the I²C-bus state machine and deselects all the channels, as does the internal
Power-On Reset (POR) function.
The pass gates of the multiplexers are constructed such that the V_DD1 pin is used to limit
the maximum high voltage which is passed by the PCA9847. This allows the use of
different bus voltages on each channel, so that 0.8 V, 1.8 V, 2.5 V or 3.3 V parts can
communicate without any additional protection. External pull-up resistors pull the bus up
to the desired voltage level for each channel. All I/O pins are 3.6 V tolerant.
2. Features and benefits
 Ultra-low voltage operation, down to 0.8 V to interface with next-generation CPUs
 1-of-8 bidirectional translating multiplexer
 Fm+ I²C-bus interface logic; compatible with SMBus standards
 Active LOW reset input
 2 address pins allowing up to 16 devices on the I²C-bus
 Channel selection via I²C-bus
 Power-up with all multiplexer channels deselected
 Low R_on 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