pcf8574.pdf

(156 KB) Pobierz
199641206 UNPDF
INTEGRATED CIRCUITS
DATA SHEET
PCF8574
Remote 8-bit I/O expander for
I 2 C-bus
Product specification
Supersedes data of September 1994
File under Integrated Circuits, IC12
1997 Apr 02
199641206.051.png
Philips Semiconductors
Product specification
Remote 8-bit I/O expander for I 2 C-bus
PCF8574
CONTENTS
1
FEATURES
2
GENERAL DESCRIPTION
3
ORDERING INFORMATION
4
BLOCK DIAGRAM
5
PINNING
6
CHARACTERISTICS OF THE I 2 C-BUS
6.1
Bit transfer
6.2
Start and stop conditions
6.3
System configuration
6.4
Acknowledge
7
FUNCTIONAL DESCRIPTION
7.1
Addressing
7.2
Interrupt
7.3
Quasi-bidirectional I/Os
8
LIMITING VALUES
9
HANDLING
10
DC CHARACTERISTICS
11
I 2 C-BUS TIMING CHARACTERISTICS
12
PACKAGE OUTLINES
13
SOLDERING
13.1
Introduction
13.2
DIP
13.2.1
Soldering by dipping or by wave
13.2.2
Repairing soldered joints
13.3
SO and SSOP
13.3.1
Reflow soldering
13.3.2
Wave soldering
13.3.3
Repairing soldered joints
14
DEFINITIONS
15
LIFE SUPPORT APPLICATIONS
16
PURCHASE OF PHILIPS I 2 C COMPONENTS
1997 Apr 02
2
199641206.054.png 199641206.055.png 199641206.056.png
Philips Semiconductors
Product specification
Remote 8-bit I/O expander for I 2 C-bus
PCF8574
1 FEATURES
2 GENERAL DESCRIPTION
·
Operating supply voltage 2.5 to 6 V
The PCF8574 is a silicon CMOS circuit. It provides general
purpose remote I/O expansion for most microcontroller
families via the two-line bidirectional bus (I 2 C).
·
Low standby current consumption of 10
m
A maximum
·
I 2 C to parallel port expander
The device consists of an 8-bit quasi-bidirectional port and
an I 2 C-bus interface. The PCF8574 has a low current
consumption and includes latched outputs with high
current drive capability for di rect ly driving LEDs. It also
possesses an interrupt line (INT) which can be connected
to the interrupt logic of the microcontroller. By sending an
interrupt signal on this line, the remote I/O can inform the
microcontroller if there is incoming data on its ports without
having to communicate via the I 2 C-bus. This means that
the PCF8574 can remain a simple slave device.
·
Open-drain interrupt output
·
8-bit remote I/O port for the I 2 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
8 devices (up to 16 with PCF8574A)
·
DIP16, or space-saving SO16 or SSOP20 packages.
The PCF8574 and PCF8574A versions differ only in their
slave address as shown in Fig.9.
3 ORDERING INFORMATION
PACKAGE
TYPE NUMBER
NAME
DESCRIPTION
VERSION
PCF8574P;
PCF8574AP
DIP16
plastic dual in-line package; 16 leads (300 mil)
SOT38-1
PCF8574T;
PCF8574AT
SO16
plastic small outline package; 16 leads; body width 7.5 mm
SOT162-1
PCF8574TS
SSOP20 plastic shrink small outline package; 20 leads; body width 4.4 mm
SOT266-1
1997 Apr 02
3
199641206.001.png
Philips Semiconductors
Product specification
Remote 8-bit I/O expander for I 2 C-bus
PCF8574
4 BLOCK DIAGRAM
handbook, full pagewidth
INT
13
INTERRUPT
LOGIC
LP FILTER
1
2
3
PCF8574
A0
A1
4
P0
5
A2
P1
14
6
P2
SCL
INPUT
FILTER
I C BUS
CONTROL
7
15
P3
SHIFT
REGISTER
I/O
PORT
SDA
8 BIT
9
P4
10
P5
11
P6
12
P7
V DD
V SS
16
8
WRITE pulse
READ pulse
POWER-ON
RESET
MBD980
Fig.1 Block diagram (SOT38-1 and SOT162-1).
1997 Apr 02
4
2
199641206.002.png 199641206.003.png 199641206.004.png 199641206.005.png 199641206.006.png 199641206.007.png 199641206.008.png 199641206.009.png 199641206.010.png 199641206.011.png 199641206.012.png 199641206.013.png 199641206.014.png 199641206.015.png 199641206.016.png 199641206.017.png 199641206.018.png 199641206.019.png
Philips Semiconductors
Product specification
Remote 8-bit I/O expander for I 2 C-bus
PCF8574
5 PINNING
PIN
SYMBOL
DESCRIPTION
DIP16; SO16
SSOP20
A0
1
6
address input 0
A1
2
7
address input 1
A2
3
9
address input 2
P0
4
10
quasi-bidirectional I/O 0
P1
5
11
quasi-bidirectional I/O 1
P2
6
12
quasi-bidirectional I/O 2
P3
7
14
quasi-bidirectional I/O 3
V SS
8
15
supply ground
P4
9
16
quasi-bidirectional I/O 4
P5
10
17
quasi-bidirectional I/O 5
P6
11
19
quasi-bidirectional I/O 6
P7
12
20
quasi-bidirectional I/O 7
INT
13
1
interrupt output (active LOW)
SCL
14
2
serial clock line
SDA
15
4
serial data line
V DD
16
5
supply voltage
n.c.
-
3
not connected
n.c.
-
8
not connected
n.c.
-
13
not connected
n.c.
-
18
not connected
handbook, halfpage
INT
1
20
P7
handbook, halfpage
A0
1
16
V DD
SCL
2
19
P6
A1
2
15
SDA
n.c.
3
18
n.c.
A2
3
14
SCL
SDA
4
17
P5
P0
4
PCF8574
PCF8574A
13
INT
V DD
5
16
P4
PCF8574TS
P1
5
12
P7
A0
6
15
V SS
P2
6
11
P6
A1
7
14
P3
P3
7
10
P5
n.c.
8
13
n.c.
V SS
8
9
P4
A2
9
12
P2
MBD979
P0
10
11
P1
MBD978
Fig.2 Pin configuration (DIP16; SO16).
Fig.3 Pin configuration (SSOP20).
1997 Apr 02
5
199641206.020.png 199641206.021.png 199641206.022.png 199641206.023.png 199641206.024.png 199641206.025.png 199641206.026.png 199641206.027.png 199641206.028.png 199641206.029.png 199641206.030.png 199641206.031.png 199641206.032.png 199641206.033.png 199641206.034.png 199641206.035.png 199641206.036.png 199641206.037.png 199641206.038.png 199641206.039.png 199641206.040.png 199641206.041.png 199641206.042.png 199641206.043.png 199641206.044.png 199641206.045.png 199641206.046.png 199641206.047.png 199641206.048.png 199641206.049.png 199641206.050.png 199641206.052.png 199641206.053.png

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin