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PCA9545D Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer PCA9545D
Beschreibung 4-channel I2C switch with interrupt logic and reset
Hersteller NXP Semiconductors
Logo NXP Semiconductors Logo 




Gesamt 14 Seiten
PCA9545D Datasheet, Funktion
INTEGRATED CIRCUITS
PCA9545
4-channel I2C switch with interrupt logic
and reset
Product data
Supersedes data of 2001 Nov 08
2002 Mar 28
Philips
Semiconductors






PCA9545D Datasheet, Funktion
Philips Semiconductors
4-channel I2C switch with interrupt logic and reset
Product data
PCA9545
CHARACTERISTICS OF THE I2C-BUS
The I2C-bus is for 2-way, 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.
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 Figure 6).
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 Figure 7).
System configuration
A device generating a message is a ‘transmitter’, a device receiving
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 Figure 8).
SDA
SCL
data line
stable;
data valid
change
of data
allowed
SW00363
Figure 6. Bit transfer
SDA
SDA
SCL
S
SCL
P
START condition
STOP condition
Figure 7. Definition of start and stop conditions
SW00365
SDA
SCL
MASTER
TRANSMITTER/
RECEIVER
SLAVE
RECEIVER
SLAVE
TRANSMITTER/
RECEIVER
MASTER
TRANSMITTER
Figure 8. System configuration
MASTER
TRANSMITTER/
RECEIVER
SLAVE
I2C
MULTIPLEXER
SW00366
2002 Mar 28
6 853-2302 27311

6 Page









PCA9545D pdf, datenblatt
Philips Semiconductors
4-channel I2C switch with interrupt logic and reset
SO20: plastic small outline package; 20 leads; body width 7.5 mm
Product data
PCA9545
SOT163-1
2002 Mar 28
12 853-2302 27311

12 Page





SeitenGesamt 14 Seiten
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