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See Technical Specifications

PCA9539DW

16-bit 2.3- to 5.5-V I2C/SMBus I/O expander with interrupt, reset & config registers

Manufacturer: Texas Instruments, Inc
Mfr.Part #: PCA9539DW
Datasheet: PCA9539DW Datasheet (PDF)
Programmable: Not Verified
Number of I/O: 16
Interface: I²C, SMBus
Interrupt Output: Yes
EDA/CAD Models: Request Free CAD Models for PCA9539DW

Email: [email protected]

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Tel: +852 95804164

PCA9539DW General Description

The system master can reset the PCA9539 in the event of a time-out or other improper operation by asserting a low in the RESET input. The power-on reset puts the registers in their default state and initializes the I²C/SMBus state machine. Asserting RESET causes the same reset/initialization to occur without de-powering the part.

The PCA9539 open-drain interrupt ( INT) output is activated when any input state differs from its corresponding Input Port register state and is used to indicate to the system master that an input state has changed.

INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I²C bus. Thus, the PCA9539 can remain a simple slave device.

The device outputs (latched) have high-current drive capability for directly driving LEDs. The device has low current consumption.

The PCA9539 is identical to the PCA9555, except for the removal of the internal I/O pullup resistor, which greatly reduces power consumption when the I/Os are held low, replacement of A2 with RESET, and a different address range.

Two hardware pins (A0 and A1) are used to program and vary the fixed I²C address and allow up to four devices to share the same I²C bus or SMBus.

Key Features

Low standby-current consumption of 1 µA max
I²C to Parallel port expander
Open-drain active-low interrupt output
Active-low reset input
5-V Tolerant I/O ports
Compatible with most microcontrollers
400-kHz Fast I²C Bus
Polarity inversion register
Address by two hardware address pins for use of up to four devices
Latched outputs with high-current drive capability for directly driving LEDs
Latch-up performance exceeds 100 mA Per JESD 78, class II
ESD protection exceeds JESD 22
- 2000-V Human-body model (A114-A)
- 1000-V Charged-device model (C101)

Specifications

Category	Integrated Circuits (ICs)InterfaceI/O Expanders	Series	-
Programmable	Not Verified	Number of I/O	16
Interface	I²C, SMBus	Interrupt Output	Yes
Features	POR	Output Type	Push-Pull
Current - Output Source/Sink	10mA, 25mA	Clock Frequency	400 kHz
Voltage - Supply	2.3V ~ 5.5V	Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount	Base Product Number	PCA9539