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PCA9534 Datasheet(PDF) 8 Page - NXP Semiconductors

Part # PCA9534
Description  8-bit I2C and SMBus, low power I/O port with interrupt
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCA9534 Datasheet(HTML) 8 Page - NXP Semiconductors

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Philips Semiconductors
Product data sheet
PCA9534
8-bit I2C and SMBus low power I/O port with interrupt
2004 Sep 30
8
TYPICAL APPLICATION
SW2093
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
VDD
VDD
SCL
SDA
INT
RESET
MASTER
CONTROLLER
GND
PCA9534
A2
A1
A0
VSS
VDD
SUBSYSTEM 3
(e.g. alarm
system)
SUBSYSTEM 2
(e.g. counter)
INT
VDD
ALARM
Controlled Switch
(e.g. CBT device)
ENABLE
10 k
10 k
10 k
2 k
NOTE: Device address configured as 0100100 for this example
I/O0, I/O1, I/O2, configured as outputs
I/O3, I/O4, I/O5, configured as inputs
I/O06, I/O7, are not used and have to be configured as outputs
A
B
10 k
INT
(5 V)
100 k
(
×3)
Figure 10. Typical application
Minimizing IDD when the I/O is used to control LEDs
When the I/Os are used to control LEDs, they are normally connected to VDD through a resistor as shown in Figure 10. Since the LED acts as a
diode, when the LED is off the I/O VIN is about 1.2 V less than VDD. The supply current, IDD, increases as VIN becomes lower than VDD and is
specified as
∆IDD in the DC characteristics table.
Designs needing to minimize current consumption, such as battery power applications, should consider maintaining the I/O pins greater than or
equal to VDD when the LED is off. Figure 11 shows a high value resistor in parallel with the LED. Figure 12 shows VDD less than the LED supply
voltage by at least 1.2 V. Both of these methods maintain the I/O VIN at or above VDD and prevents additional supply current consumption when
the LED is off.
VDD
VDD
LEDx
LED
100 k
SW02086
Figure 11. High value resistor in parallel with the LED
VDD
3.3 V
LEDx
LED
SW02087
5 V
Figure 12. Device supplied by a lower voltage


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