Datasheet > PCA9849PW

PCA9849PW

更新时间： 2024-11-15 01:15:31

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
30页	968K
描述
4-channel ultra-low voltage, Fm I2C-bus multiplexer with reset

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PCA9849PW 数据手册

PCA9849

4-channel ultra-low voltage, Fm+ I²C-bus multiplexer with

reset

Rev. 1 — 16 November 2015

Product data sheet

1. General description

The PCA9849 is an ultra-low voltage, quad bidirectional translating multiplexer controlled

via the I²C-bus. The SCL/SDA upstream pair fans out to four downstream pairs, or

channels. A 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 PCA9849 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 switches are constructed such that the V_DD1pin is used to limit the

maximum high voltage which is passed by the PCA9849. 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-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 R_onswitches

 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

12 3 4 5 6 7...30

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