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PDF PCF8575CTS Data sheet ( Hoja de datos )

Número de pieza PCF8575CTS
Descripción Remote 16-bit I/O expander for I2C-bus
Fabricantes NXP Semiconductors 
Logotipo NXP Semiconductors Logotipo



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No Preview Available ! PCF8575CTS Hoja de datos, Descripción, Manual

INTEGRATED CIRCUITS
DATA SHEET
PCF8575C
Remote 16-bit I/O expander for
I2C-bus
Product specification
File under Integrated Circuits, IC12
1999 Aug 05

1 page




PCF8575CTS pdf
Philips Semiconductors
Remote 16-bit I/O expander for I2C-bus
Product specification
PCF8575C
5 PINNING
SYMBOL
INT
A1
A2
P00
P01
P02
P03
P04
P05
P06
P07
VSS
P10
P11
P12
P13
P14
P15
P16
P17
A0
SCL
SDA
VDD
PIN DESCRIPTION
1 interrupt output (active LOW)
2 address input 1
3 address input 2
4 quasi-bidirectional I/O 00
5 quasi-bidirectional I/O 01
6 quasi-bidirectional I/O 02
7 quasi-bidirectional I/O 03
8 quasi-bidirectional I/O 04
9 quasi-bidirectional I/O 05
10 quasi-bidirectional I/O 06
11 quasi-bidirectional I/O 07
12 supply ground
13 quasi-bidirectional I/O 10
14 quasi-bidirectional I/O 11
15 quasi-bidirectional I/O 12
16 quasi-bidirectional I/O 13
17 quasi-bidirectional I/O 14
18 quasi-bidirectional I/O 15
19 quasi-bidirectional I/O 16
20 quasi-bidirectional I/O 17
21 address input 0
22 serial clock line input
23 serial data line input/output
24 supply voltage
handbook, halfpage
INT 1
A1 2
24 VDD
23 SDA
A2 3
22 SCL
P00 4
21 A0
P01 5
20 P17
P02 6
19 P16
PCF8575C
P03 7
18 P15
P04 8
17 P14
P05 9
16 P13
P06 10
15 P12
P07 11
14 P11
VSS 12
13 P10
MGS631
Fig.2 Pin configuration.
1999 Aug 05
5

5 Page





PCF8575CTS arduino
Philips Semiconductors
Remote 16-bit I/O expander for I2C-bus
Product specification
PCF8575C
7 CHARACTERISTICS OF THE I2C-BUS
The I2C-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 must be connected to a positive supply via a pull-up
resistor when connected to the output stages of a 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
data on the SDA line must remain stable during the HIGH
period of the clock pulse as changes in the data line at 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 bus is not
busy. A HIGH-to-LOW transition of 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).
7.4 Acknowledge
The number of data bytes transferred between the START
and the STOP conditions from transmitter to receiver is 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 generate an 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 line is stable LOW during the HIGH period of
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
done by the master receiver by holding the SDA line HIGH.
In this event the transmitter must release the data line to
enable the master to generate a STOP condition.
7.3 System configuration
A device generating a message is a ‘transmitter’, a device
receiving the message is the ‘receiver’. The device that
controls the message is the ‘master’ and the devices which
are controlled by the master are the ‘slaves’ (see Fig.11).
handbook, full pagewidth
SDA
SCL
data line
stable;
data valid
change
of data
allowed
Fig.9 Bit transfer.
MBC621
1999 Aug 05
11

11 Page







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