PCA9544AD-T datasheet, PDF - EEWORLD Datasheet

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PCA9544AD-T: Description4-channel I2C multiplexer with interrupt logic - # of Addresses: 8 ; I2C-bus: 400 kHz; Inputs: 1 ; Interrupt: 4-1 ; Operating temperature: -40~85 Cel; Operating voltage: 2.3~5.5 VDC; Outputs: 4; Categorylogic logic; File Size794KB，27 Pages; ManufacturerNXP; Websitehttps://www.nxp.com; Environmental Compliance

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PCA9544AD-T Overview

4-channel I2C multiplexer with interrupt logic - # of Addresses: 8 ; I2C-bus: 400 kHz; Inputs: 1 ; Interrupt: 4-1 ; Operating temperature: -40~85 Cel; Operating voltage: 2.3~5.5 VDC; Outputs: 4

PCA9544AD-T Parametric

Parameter Name	Attribute value
Source Url Status Check Date	2013-06-14 00:00:00
Is it lead-free?	Contains lead
Is it Rohs certified?	conform to
Maker	NXP
package instruction	7.50 MM, PLASTIC, MS-013, SOT-163-1, SOP-20
Reach Compliance Code	compliant
Other features	ALSO OPERATES WITH 3.6 TO 5.5V SUPPLY
series	9544
JESD-30 code	R-PDSO-G20
JESD-609 code	e4
length	12.8 mm
Logic integrated circuit type	MULTIPLEXER
Number of functions	1
Number of entries	2
Output times	1
Number of terminals	20
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Output polarity	TRUE
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
propagation delay (tpd)	0.3 ns
Maximum seat height	2.65 mm
Maximum supply voltage (Vsup)	3.6 V
Minimum supply voltage (Vsup)	2.3 V
Nominal supply voltage (Vsup)	3.3 V
surface mount	YES
Temperature level	INDUSTRIAL
Terminal surface	Nickel/Palladium/Gold (Ni/Pd/Au)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
width	7.5 mm

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INTEGRATED CIRCUITS

APPLICATION NOTE

AN262_2

PCA954X FAMILY OF I²C / SMBus MULTIPLEXERS

and SWITCHES

PCA9540B, PCA9541, PCA9542A, PCA9543A, PCA9544A, PCA9545A,

PCA9546A, PCA9547, PCA9548A, PCA9549

Abstract

Philips Semiconductors family of Multiplexers and Switches are detailed in this application note that

discusses device operation, software programming, pull up resistor sizing/bus termination and typical

applications.

Paul Boogaards -

Field Application Engineer

Jean-Marc Irazabal -

PCA Technical Marketing Manager

Steve Blozis -

PCA International Product Manager

Specialty Logic Product Line

Logic Product Group

Philips Semiconductors

October 27, 2004

TABLE OF CONTENTS

TABLE OF CONTENTS ...................................................................................................................................................2

OVERVIEW .......................................................................................................................................................................3

ESCRIPTION

.....................................................................................................................................................................3

PPLICATIONS

...................................................................................................................................................................3

EATURES

.........................................................................................................................................................................3

PERATING

HARACTERISTICS

.........................................................................................................................................4

EVICE

INOUT

.................................................................................................................................................................5

RDERING

NFORMATION

..................................................................................................................................................6

ATA

HEETS AND

IBIS M

ODELS

.....................................................................................................................................6

TECHNICAL INFORMATION .......................................................................................................................................6

LOCK

IAGRAM

PCA954

X DEVICES

XCEPT

PCA9541

AND

PCA9549) ......................................................................6

LOCK

IAGRAM

PCA9541..............................................................................................................................................8

LOCK

IAGRAM

PCA9549..............................................................................................................................................9

I²C C

OMMUNICATIONS

......................................................................................................................................................9

NTERRUPTS

....................................................................................................................................................................11

OMMAND

EQUENCING

.................................................................................................................................................13

OWER UP

/ R

ESET DEFAULT STATE

................................................................................................................................13

OLTAGE

LAMPING

......................................................................................................................................................13

OLTAGE

RANSLATION

.................................................................................................................................................14

OW TO USE THE

PCA9541

AS A

CHANNEL MULTIPLEXER

..........................................................................................15

ETERMINING

ULL

-U

ESISTORS VALUES

...................................................................................................................15

APPLICATIONS..............................................................................................................................................................19

C M

ULTIPLEXING

.........................................................................................................................................................19

OLTAGE

EVEL

HIFTING

.............................................................................................................................................19

APACITIVE

OAD

HARING

...........................................................................................................................................19

YPICAL

PPLICATION

....................................................................................................................................................20

FREQUENTLY ASKED QUESTIONS .........................................................................................................................20

ADDITIONAL INFORMATION ...................................................................................................................................26

REVISION HISTORY.....................................................................................................................................................26

OVERVIEW

Description

The Philips family of Multiplexers and Switches consists of bi-directional translating switches controlled via the I

C or

SMBus to fan out an upstream SCL/SDA pair to 2, 4 or 8 downstream channels of SCx/SDx pairs. The Multiplexers

allow only one downstream channel to be selected at a time, while the Switches allow any individual downstream

channel or combination of downstream channels to be selected, depending on the content of the programmable control

register. Once one or several channels have been selected, the device acts as a wire, allowing the master on the upstream

channel to send commands to devices on all the active downstream channels, and devices on the active downstream

channels to communicate with each other and the master. External pull-up resistors are used to pull each individual

channel up to the desired voltage level. Combined interrupt output and hardware reset input are device options that are

featured.

MULTIPLEXER

I C Bus

Interrupt

Out

Controller

SWITCH

C Bus 0

C Bus

Reset

Interrupt

Out

Controller

C Bus 0

OFF

I C Bus 1

Interrupt 0

Interrupt 1

C Bus 1

OFF

Interrupt 0

Interrupt 1

Applications

These devices can be used for a wide variety of applications:

C Multiplexing

- Some specialized devices only have one I

C or SMBus address and sometimes several identical

devices are needed in the same system. The multiplexers and switches split the I

C bus into several sub-branches and

allow the I

C master to select and address one of multiple identical devices, in order to resolve address conflict issues.

Voltage Level Shifting

- Many I

C and SMBus devices operate at different voltage levels but need to operate on a

common bus. The multiplexers and switches allow translation between 1.65 V and 5.5 V. So, for example, a 5 V I

master on the upstream channel can communicate with a 3.3 V (non 5 V tolerant) SMBus device on channel 0 and a

2.5 V I

C device on channel 1. The channel pass gates are constructed such that the V

pin can be used to limit the

maximum high voltage that will be passed by the device. This allows the use of different bus voltages on each pair, so

that 1.8 V or 2.5 V or 3.3 V devices can communicate with 5 V devices without any additional protection. All I/O pins

are tolerant up to 6.0 V. The Switches are best for this application since multiple downstream channels can be active at

the same time.

Capacitive Load Sharing

- Adding more I

C and SMBus devices on the bus may exceed the 400 pF limitation. The

multiplexers and switches can isolate devices that are not currently needed to reduce the overall system loading and

maintain the total system load below 400 pF. When active, the channels act as a wire and the cumulative capacitive

loading of the upstream channel and all active downstream channels must be considered.

Features

Interrupt Function

- Interrupt inputs, one for each of the downstream channels, are provided as an option on both the

Multiplexers and Switches. The single interrupt output acts as an OR of the interrupt inputs and is not latched.

Hardware Reset

- An external active low hardware reset pin (/RESET) is provided on the Switches in addition to the

Power On Reset (POR) feature found on both the Multiplexers and Switches. Either /RESET or POR resets the

downstream channels to the default state of no channels selected. The reset feature is useful should a downstream device

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