PCF8575CTS ,Remote 16-bit I/O expander for I2C-busFEATURES• Operating supply voltage from 4.5 to 5.5 V• Low standby current consumption of 10 μA maxi ..
PCF8575DBQR ,Remote 16-Bit I2C and SMBus I/O Expander with Interrupt Output 24-SSOP -40 to 85Features2• I C to Parallel-Port Expander 3 DescriptionThis 16-bit I/O expander for the two-line bid ..
PCF8575DBR ,Remote 16-Bit I2C and SMBus I/O Expander with Interrupt Output 24-SSOP -40 to 85 SCPS121F–JANUARY 2005–REVISED MAY 20156 Pin Configurations and Functions(TOPVIEW) (TOPVIEW)INTPin ..
PCF8575DW ,Remote 16-Bit I2C and SMBus I/O Expander with Interrupt Output 24-SOIC -40 to 85Electrical Characteristics....... 52 13 Device and Documentation Support........ 257.6 I C Interfac ..
PCF8575PW ,Remote 16-Bit I2C and SMBus I/O Expander with Interrupt Output 24-TSSOP -40 to 85Block Diagram... 132 Applications..... 19.3 Feature Description.... 143 Description....... 19.4 Dev ..
PCF8575PWR ,Remote 16-Bit I2C and SMBus I/O Expander with Interrupt Output 24-TSSOP -40 to 85features a 16-bit quasi-bidirectionalCapability for Directly Driving LEDsinput/output (I/O) port (P ..
PH965C6 ,SPECIFICATIONSPECIFICATIONFuji Electric Co.,Ltd.Matsumoto FactoryFu ji Electric Co.,Ltd. MS5D1444 1/12 ..
PH975C6 , Low-Loss Fast Recovery Diode
PH9930L , N-channel TrenchMOS logic level FET
PHB101NQ03LT ,TrenchMOS(tm) logic level FET
PHB101NQ03LT ,TrenchMOS(tm) logic level FET
PHB110NQ08T ,N-channel TrenchMOS standard level FETapplications Uninterruptible power supplies1.4 Quick reference data Table 1. Quick referenceSymbol ..
PCF8575CTS
Remote 16-bit I/O expander for I2C-bus
Philips Semiconductors Product specification
Remote 16-bit I/O expander for I2 C-bus PCF8575C
CONTENTS FEATURES GENERAL DESCRIPTION ORDERING INFORMATION BLOCK DIAGRAM PINNING FUNCTIONAL DESCRIPTION
6.1 Quasi-bidirectional I/Os
6.2 Addressing
6.3 Reading from a port (input mode)
6.4 Writing to the port (output mode)
6.5 Interrupt CHARACTERISTICS OF THE I2C-BUS
7.1 Bit transfer
7.2 START and STOP conditions
7.3 System configuration
7.4 Acknowledge LIMITING VALUES HANDLING CHARACTERISTICS I2 C-BUS TIMING CHARACTERISTICS DEVICE PROTECTION PACKAGE OUTLINE SOLDERING
14.1 Introduction to soldering surface mount
packages
14.2 Reflow soldering
14.3 Wave soldering
14.4 Manual soldering
14.5 Suitability of surface mount IC packages for
wave and reflow soldering methods DEFINITIONS LIFE SUPPORT APPLICATIONS PURCHASE OF PHILIPS I2 C COMPONENTS
Philips Semiconductors Product specification
Remote 16-bit I/O expander for I2 C-bus PCF8575C
FEATURES Operating supply voltage from 4.5to 5.5V Low standby current consumption of 10 μA maximumI2 C-bus to parallel port expander 400 kbits/s FAST I2C-bus Open-drain interrupt output 16-bit remote I/O port for the I2 C-bus Compatible with most microcontrollers Latched outputs with high current drive capability for
directly driving LEDs Address by 3 hardware address pins for use of up to devices SSOP24 package.
GENERAL DESCRIPTIONThe device is a silicon CMOS circuit. It provides general
purpose remote I/O expansion for most microcontroller
families via the two-line bidirectional bus (I2 C-bus).
The device consistsofa 16-bit quasi-bidirectional port and
an I2 C-bus interface. The PCF8575C has a low current
consumption and includes latched outputs with high
current drive capability for directly driving LEDs. It also
possessesan interrupt line (INT) which canbe connected the interrupt logicof the microcontroller.By sendingan
interrupt signal on this line, the remote I/O can inform the
microcontrollerif thereis incoming dataonits ports without
having to communicate via the I2 C-bus. This means that
the device is an I2C-bus slave transmitter/receiver.
Every data transmission from the PCF8575C must consist
of an even number of bytes, the first byte will be referredas P07to P00 and the second byteas P17to P10. The
third will be referred to as P07to P00 and so on.
ORDERING INFORMATION
Philips Semiconductors Product specification
Remote 16-bit I/O expander for I2 C-bus PCF8575C
BLOCK DIAGRAM
Philips Semiconductors Product specification
Remote 16-bit I/O expander for I2 C-bus PCF8575C
PINNING
Philips Semiconductors Product specification
Remote 16-bit I/O expander for I2 C-bus PCF8575C FUNCTIONAL DESCRIPTION
6.1 Quasi-bidirectional I/Os
The16 ports (see Fig.3) are entirely independent andcanbe usedeitheras inputor output ports. Input datais transferred
from the portsto the microcontrollerin the READ mode (see Fig.6). Output datais transmittedto the portsin the WRITE
mode (see Fig.5).
This quasi-bidirectional I/O can be used as an input or output without the use of a control signal for data direction. power-on all the I/Os are in 3-state mode. The strong pull-up to VDD (IOHt) allows a fast rising edge into a heavily
loaded output. This strong pull-up turnson when the outputis written HIGH, andis switchedoffby the negative edgeof
SCL. After this short period the outputisin 3-state mode. The I/O shouldbe written HIGH before being usedasan input.
After power-on as all the I/Os are set to 3-state all of them can be used as inputs. Any change in setting of the I/Os as
either inputsor outputs canbe done with the write mode. Warning:Ifa HIGHis appliedtoan I/O which has been written
earlier to LOW, a large current (IOL) will flow to VSS (see Chapter 10; note3).
6.2 Addressing
Figures4,5 and 6 show the address and timing diagrams. Before any data is transmitted or received the master must
send the addressof the receivervia the SDA line. The firstbyte transmitted after the START condition carriestheaddress the slave device and the read/writebit. The addressof the slave device must notbe changed between the START and
the STOP conditions. The PCF8575C acts as a slave receiver or a slave transmitter.
Philips Semiconductors Product specification
Remote 16-bit I/O expander for I2 C-bus PCF8575C
This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader
.This text is here in
white
force
landscape
pages
rotated
correctly
when
browsing
through
the
pdf
the
Acrobat
reader.This
text
here
inThis
text
here
white
force
landscape
pages
rotated
correctly
when
browsing
through
the
pdf
the
Acrobat
reader.
white
force
landscape
pages
...
Philips Semiconductors Product specification
Remote 16-bit I/O expander for I2 C-bus PCF8575C
This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader
.This text is here in
white
force
landscape
pages
rotated
correctly
when
browsing
through
the
pdf
the
Acrobat
reader.This
text
here
inThis
text
here
white
Philips Semiconductors Product specification
Remote 16-bit I/O expander for I2 C-bus PCF8575C
6.3 Reading from a port (input mode)
All ports programmed as input should be set to logic1. read, the master (microcontroller) first addresses the
slave device after it receives the interrupt. By setting the
last bit of the byte containing the slave address to logic1
the read mode isentered. The databytes that followon the
SDA are the values on the ports. the dataon the input port changes faster than the master
can read, this data may be lost.
6.4 Writing to the port (output mode)
To write, the master (microcontroller) first addresses the
slave device. By setting the last bit of the byte containing
the slave addressto logic0 the write modeis entered. The
PCF8575C acknowledges and the master sends the first
data byte for P07to P00. After the first data byte is
acknowledged by the PCF8575C, the second data byte
P17to P10 is sent by the master. Once again the
PCF8575C acknowledges the receipt of the data after
which this 16-bit data is presented on the port lines.
The numberof data bytes that canbe sent successivelyis
not limited. After every two bytes the previous data is
overwritten.
The first data byte in every pair refers to Port0
(P07to P00), whereas the second data bytein every pair
refers to Port 1 (P17to P10), see Fig.7.
6.5 Interrupt
The PCF8575C provides an open-drain interrupt (INT)
which can be fed to a corresponding input of the
microcontroller (see Figs5,6 and 8). This gives these
chips a kind of a master function which can initiate an
action elsewhere in the system. interruptis generatedby any risingor falling edgeof the
port inputs. After time tiv the signal INT is valid.
The interrupt disappears when dataon the portis changed the original settingor datais read fromor writtento the
device which has generated the interrupt.
In the write mode the interrupt may become deactivated
(HIGH)on the rising edgeof the writeto port pulse. On the
falling edge of the write to port pulse the interrupt is
definitely deactivated (HIGH).
The interrupt is reset in the read mode on the rising edge
of the read from port pulse.
During the resetting of the interrupt itself any changes on
the I/Os may not generate an interrupt. After the interrupt reset any changein I/Os willbe detected andtransmitted
as an INT.
Philips Semiconductors Product specification
Remote 16-bit I/O expander for I2 C-bus PCF8575C
Philips Semiconductors Product specification
Remote 16-bit I/O expander for I2 C-bus PCF8575C CHARACTERISTICS OF THE I2 C-BUS
The I2 C-bus is for bidirectional, 2-line communication
between different ICs or modules. The two lines are a
serial data line (SDA) and a serial clock line (SCL). Both
lines mustbe connectedtoa positive supply viaa pull-up
resistor when connectedto the output stagesofa device.
Data transfer may be initiated only when the bus is not
busy.
7.1 Bit transfer
One data bit is transferred during each clock pulse. The
dataon the SDA line must remain stable during the HIGH
periodof the clock pulseas changesin the data lineat this
time will be interpreted as control signals (see Fig.9).
7.2 START and STOP conditions
Both data and clock lines remain HIGH when the busis not
busy.A HIGH-to-LOW transitionof the data line, while the
clock is HIGH is defined as the START condition (S).
A LOW-to-HIGH transition of the data line while the clock
is HIGH is defined as the STOP condition P (see Fig.10).
7.3 System configuration device generatinga messageisa ‘transmitter’,a device
receiving the message is the ‘receiver’. The device that
controls the messageis the ‘master’ andthe devices which
are controlled by the master are the ‘slaves’ (see Fig.11).
7.4 Acknowledge
The numberof data bytes transferred between the START
and the STOPconditions from transmitterto receiveris not
limited. Each byte of eight bits is followed by one
acknowledge bit. The transmitter must release the SDA
line before the receiver can send an acknowledge bit.
A slave receiver which is addressed must generate an
acknowledge after the reception of each byte. Also a
master must generatean acknowledge after the reception
of each byte that has been clocked out of the slave
transmitter. The device that acknowledges has to pull
down the SDA line during the acknowledge clock pulse,so
that the SDA lineis stable LOW during the HIGH periodof
the acknowledge related clock pulse, set-up and hold
times must be taken into account.
A master receiver must signal an end of data to the
transmitter by not generating an acknowledge after the
last byte that has been clocked out of the slave. This is
doneby the master receiverby holding the SDA line HIGH.
In this event the transmitter must release the data line to
enable the master to generate a STOP condition.
Philips Semiconductors Product specification
Remote 16-bit I/O expander for I2 C-bus PCF8575C
