PCA9535 Philips Semiconductors, PCA9535 Datasheet - Page 10

• Manufacturer Part Number: PCA9535
• Description: 16-bit I2C and SMBus/ low power I/O port with interrupt
• Manufacturer: Philips Semiconductors

Philips Semiconductors
TYPICAL APPLICATION
Minimizing I
When the I/Os are used to control LEDs, they are normally connected to V
diode, when the LED is off the I/O V
specified as ∆I
Designs needing to minimize current consumption, such as battery power applications, should consider maintaining the I/O pins greater than or
equal to V
voltage by at least 1.2 V. Both of these methods maintain the I/O V
the LED is off.
2003 Jun 27
16-bit I
V
Figure 12. High value resistor in parallel with the LED
DD
NOTE: Device address configured as 0100100 for this example
CONTROLLER
DD
I/O
I/O
I/O
MASTER
2
when the LED is off. Figure 12 shows a high value resistor in parallel with the LED. Figure 13 shows V
0.0
0.3
0.6
C and SMBus, low power I/O port with interrupt
DD
GND
DD
, I/O
, I/O
, I/O
in the DC characteristics table.
V
DD
0.1
0.4
0.7
when the I/O is used to control LEDs
V
, I/O
, I/O
, and I/O
DD
LEDx
SDA
SCL
INT
0.2
0.5
, configured as outputs
, configured as inputs
1.0
1.6 kΩ
to I/O
1.7
LED
IN
configured as inputs
1.6 kΩ
is about 1.2 V less than V
100 k
1.1 kΩ
V
DD
Figure 11. Typical application
2 kΩ
SW02086
DD
IN
A2
A1
A0
SDA
. The supply current, I
INT
SCL
at or above V
PCA9535
V
10
DD
V
DD
SS
through a resistor as shown in Figure 11. Since the LED acts as a
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
1.0
1.1
1.3
1.4
1.5
1.6
1.7
1.2
DD
Figure 13. Device supplied by a lower voltage
and prevents additional supply current consumption when
DD
, increases as V
2 kΩ
ALARM
(e.g. alarm system)
V
3.3 V
NUMERIC
SUBSYSTEM 3
DD
10 DIGIT
KEYPAD
LEDx
(e.g. temp sensor)
LED
INT
SUBSYSTEM 1
IN
becomes lower than V
5 V
Controlled Switch
(e.g. CBT device)
DD
less than the LED supply
ENABLE
PCA9535
RESET
SUBSYSTEM 2
(e.g. counter)
A
B
Product data
SW02094
SW02087
DD
V
DD
and is