TI PCA9539DWR

This 16-bit expander for the two-wire bidirectional bus (I2C) is designed to operate between 2.3V and 5.5V VCC. Through the I2C interface [Serial Clock (SCL), Serial Data (SDA)], it provides general-purpose remote I/O expansion for most microcontroller families. The PCA9539 consists of two 8-bit configuration (input or output selectable), input port, output port, and polarity inversion (active-high or active-low operation) registers. At power-up, the I/Os are configured as inputs. The system master controller can enable the I/Os as inputs or outputs by writing to the I/O configuration bits. The data for each input or output is stored in the corresponding input or output register. The polarity of the input port register can be inverted with the help of the polarity inversion register. All registers can be read by the system master.

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.

• 1μA low standby current consumption (maximum)
• I2C to parallel port expander
• Open-drain active-low interrupt output
• Active-low reset input
• 5V-tolerant I/O ports
• Compatible with most microcontrollers
• 400kHz fast I2C bus
• Polarity inversion register
• Two hardware address pins for addressing up to 4 devices
• Latched outputs with high current drive capability for direct LED driving
• Latch-up performance exceeds 100mA per JESD 78 Class II
• ESD protection exceeds JESD 22 requirements
• 2000V Human Body Model (A114-A)
• 1000V Charged Device Model (C101)