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PDF PCF8570 Data sheet ( Hoja de datos )

Número de pieza PCF8570
Descripción 256 x 8-bit static low-voltage RAM with I2C-bus interface
Fabricantes NXP Semiconductors 
Logotipo NXP Semiconductors Logotipo



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No Preview Available ! PCF8570 Hoja de datos, Descripción, Manual

INTEGRATED CIRCUITS
DATA SHEET
PCF8570
256 × 8-bit static low-voltage RAM
with I2C-bus interface
Product specification
Supersedes data of 1997 Sep 02
File under Integrated Circuits, IC12
1999 Jan 06

1 page




PCF8570 pdf
Philips Semiconductors
256 × 8-bit static low-voltage RAM with
I2C-bus interface
Product specification
PCF8570
8 CHARACTERISTICS OF THE I2C-BUS
The I2C-bus is for bidirectional, two-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. Data transfer may be initiated only when the bus
is not busy.
8.1 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 a control signal.
SDA
SCL
data line
stable;
data valid
change
of data
allowed
MBA607
Fig.3 Bit transfer.
8.2 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).
SDA
SCL
S
START condition
SDA
SCL
P
STOP condition
MBA608
Fig.4 Definition of start and stop conditions.
1999 Jan 06
5

5 Page





PCF8570 arduino
Philips Semiconductors
256 × 8-bit static low-voltage RAM with
I2C-bus interface
13 APPLICATION INFORMATION
13.1 Application example
Product specification
PCF8570
handbook, full pagewidth
VDD
0 A0
0 A1
0 A2
SCL
PCF8570
'1010'
TEST
VSS SDA
VDD
SDA
MASTER
TRANSMITTER/
SCL RECEIVER
VDD
VDD 1 A0
0 A1
0 A2
SCL
PCF8570
'1010'
TEST
VSS SDA
up to 8 PCF8570C
V DD
VDD 1 A0
VDD 1 A1
VDD 1 A2
SCL
PCF8570
'1010'
TEST
VSS SDA
V DD
R R R: pull up resistor
R= tr
C BUS
SDA SCL
(I2C bus)
MLB931
It is recommended that a 4.7 µF/10 V solid aluminium capacitor (SAL) be connected between VDD and VSS.
Fig.11 Application diagram.
1999 Jan 06
11

11 Page







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