PCA9849PW数据手册恩XP中文资料规格书

描述 Description

The PCA9849 is an ultra-low voltage, quad bidirectional translating multiplexercontrolled via the I²C-bus. The SCL/SDA upstream pair fans out to fourdownstream pairs, or channels. A single SCx/SDx channel can be selected, determined bythe programmable control register. This feature allows multiple devices with the sameI²C-bus address to reside on the same bus. The multiplexer device canalso separate a heavily loaded I²C-bus into separate bus segments,eliminating the need for a bus buffer.
An active LOW reset input allows the PCA9849 to recover from a situation where one of thedownstream I²C-buses is stuck in a LOW state. Pulling the RESET pin LOW resets the I²C-bus state machineand deselects all the channels, as does the internal Power-On Reset (POR) function.
The pass gates of the switches are constructed such that the VDD1 pin is usedto limit the maximum high voltage which is passed by the PCA9849. This allows the use ofdifferent bus voltages on each channel, so that 0.8 V, 1.8 V, 2.5 V or 3.3 V parts cancommunicate without any additional protection. External pull-up resistors pull the busup to the desired voltage level for each channel. All I/O pins are 3.6 V tolerant.

特性 Features

Ultra-low voltage operation, down to 0.8 V to interface with next-generationCPUs
1-of-4 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 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 perJESD22-C101
Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
Two packages offered: TSSOP16 and HVQFN16