pca9655e ON Semiconductor, pca9655e Datasheet - Page 14

• Manufacturer Part Number: pca9655e
• Description: Pca9655e Remote 16-bit I/o Expander For I2c Bus With Interrupt
• Manufacturer: ON Semiconductor

Characteristics of the I
between different ICs or modules. The two lines are the
serial data line (SDA) and the 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 only be initiated when the bus is not busy.
(5 V)
V
The I
DD
IO0_0, IO0_2, IO0_3 configured as outputs.
IO0_1, IO0_4, IO0_5 configured as inputs.
IO0_6, IO0_7, and IO1_0 to IO1_7 configured as inputs.
Device address configured as 0100 000xb for this example.
CONTROLLER
2
C−bus is meant for 2−way, 2−line communication
MASTER
GND
V
DD
SCL
SDA
INT
2
C−Bus
10 kW
10 kW
10 kW
APPLICATION INFORMATION
Figure 11. Typical Application
AD2
AD1
AD0
INT
SCL
SDA
PCA9655E
http://onsemi.com
V
V
DD
SS
IO0_0
IO0_1
IO0_2
IO0_3
IO0_4
IO0_5
IO0_6
IO0_7
IO1_0
IO1_1
IO1_2
IO1_3
IO1_4
IO1_5
IO1_6
IO1_7
14
Bit Transfer
data on the SDA line must remain stable during the HIGH
period of the clock pulse. Changes in the data line during the
HIGH period of the clock pulse will be interpreted as control
signals (see Figure 12).
One data bit is transferred during each clock pulse. The
2 kW
NUMERIC
KEYPAD
10 DIGIT
ENABLE
INT
RESET
ALARM
(e.g., alarm system)
(e.g., temp sensor)
A
B
SUB−SYSTEM 1
SUB−SYSTEM 2
SUB−SYSTEM 3
(e.g., counter)
controlled
switch
(e.g., 7SB or FST)
V
DD