PCA9538PW,118 NXP Semiconductors, PCA9538PW,118 Datasheet - Page 7

• Manufacturer Part Number: PCA9538PW,118
• Description: IC I/O EXPANDER I2C 8B 16TSSOP
• Manufacturer: NXP Semiconductors

Specifications of PCA9538PW,118

• Package / Case: 16-TSSOP
• Interface: I²C, SMBus
• Number Of I /o: 8
• Interrupt Output: Yes
• Frequency - Clock: 400kHz
• Voltage - Supply: 2.3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Includes: POR
• Logic Family: PCA9538
• Number Of Lines (input / Output): 8.0 / 8.0
• Operating Supply Voltage: 2.3 V to 5.5 V
• Power Dissipation: 200 mW
• Operating Temperature Range: - 40 C to + 85 C
• Input Voltage: 5 V
• Logic Type: I2C, SMBus
• Maximum Clock Frequency: 400 KHz
• Mounting Style: SMD/SMT
• Number Of Input Lines: 8.0
• Number Of Output Lines: 8.0
• Output Current: 50 mA
• Output Voltage: 5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 568-3615 - DEMO BOARD I2C
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 568-1840-2; 935277419118; PCA9538PW-T

NXP Semiconductors
PCA9538_5
Product data sheet
6.2.5 Register 3 - Configuration register
6.3 Power-on reset
6.4 RESET input
6.5 Interrupt output
This register configures the directions of the I/O pins. If a bit in this register is set, the
corresponding port pin is enabled as an input with high-impedance output driver. If a bit in
this register is cleared, the corresponding port pin is enabled as an output. At reset, the
I/Os are configured as inputs.
Table 7.
Legend: * default value.
When power is applied to V
a reset condition until V
and the PCA9538 registers and state machine will initialize to their default states.
Thereafter, V
For a power reset cycle, V
operating voltage.
A reset can be accomplished by holding the RESET pin LOW for a minimum of t
The PCA9538 registers and SMBus/I
state until the RESET input is once again HIGH. This input requires a pull-up resistor to
V
The open-drain interrupt output (INT) is activated when one of the port pins changes state
and the pin is configured as an input. The interrupt is de-activated when the input returns
to its previous state or the Input Port register is read.
Note that changing an I/O from an output to an input may cause a false interrupt to occur
if the state of the pin does not match the contents of the Input Port register.
Bit
7
6
5
4
3
2
1
0
DD
if no active connection is used.
Symbol
C7
C6
C5
C4
C3
C2
C1
C0
Register 3 - Configuration register bit description
DD
must be lowered below 0.2 V to reset the device.
8-bit I
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
2
DD
Rev. 05 — 28 May 2009
C-bus and SMBus low power I/O port with interrupt and reset
DD
has reached V
DD
must be lowered below 0.2 V and then restored to the
, an internal Power-On Reset (POR) holds the PCA9538 in
Value
1*
1*
1*
1*
1*
1*
1*
1*
2
C-bus state machine will be held in their default
POR
Description
configures the directions of the I/O pins
0 = corresponding port pin enabled as an output
1 = corresponding port pin configured as an input
(default value)
. At that point, the reset condition is released
PCA9538
© NXP B.V. 2009. All rights reserved.
w(rst)
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