PCA9539PWR

This 16-bit expander for two-wire bidirectional bus (I2C) is designed to operate between 2.3V and 5.5V VCC. Via 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-on, 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 held in the corresponding input or output register. The polarity of the input port registers can be inverted using the polarity inversion register. All registers are readable by the system master controller.

Key features

• 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-mode I²C bus
• Polarity inversion register
• Addressing via two hardware address pins, supporting up to 4 devices
• Latched outputs with high current drive capability for direct LED driving
• Latch-up performance exceeding 100mA per JESD78 Class II specification
• ESD protection performance exceeding JESD22 specification requirements
• 2000V Human Body Model (A114-A)
• 1000V Charged Device Model (C101)