pca9537dp NXP Semiconductors, pca9537dp Datasheet - Page 8

• Manufacturer Part Number: pca9537dp
• Description: 4-bit I2c And Smbus Low Power I/o Port With Interrupt And Reset
• Manufacturer: NXP 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.
2006 Sep 21
4-bit I
I/O port with interrupt and reset
(5 V)
V
Figure 10. High value resistor in parallel with the LED
DD
NOTE: Device address is 1001001 for this example
DD
2
C-bus and SMBus low power
CONTROLLER
I/O
I/O
when the LED is off. Figure 10 shows a high value resistor in parallel with the LED. Figure 11 shows V
DD
0
1
MASTER
, I/O
, configured as input
DD
in the DC characteristics table.
2
, I/O
when the I/O is used to control LEDs
GND
V
DD
V
DD
3
I/Ox
, configured as outputs
RESET
INT
SDA
SCL
10 k
LED
IN
is about 1.2 V less than V
10 k
100 k
V
DD
10 k
Figure 9. Typical application
SW02326
10 k
DD
IN
. The supply current , I
at or above V
8
SDA
INT
SCL
RESET
DD
PCA9537
V
through a resistor as shown in Figure 9. Since the LED acts as a
DD
V
SS
DD
Figure 11. Device supplied by a lower voltage
and prevents additional supply current consumption when
I/O
I/O
I/O
I/O
0
1
2
3
DD
2 k
, increases as V
V
3.3 V
DD
I/Ox
100 k
ENABLE
IN
becomes lower than V
LED
DD
A
B
(e.g. temp sensor)
INT
RESET
SUBSYSTEM 1
5 V
SUBSYSTEM 2
(e.g. counter)
less than the LED supply
PCA9537
Controlled Switch
(e.g. CBT device)
Product data sheet
SW02189
DD
SW02327
and is