PCA9555DWR

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 PCA9555 consists of two 8-bit configuration (input or output selectable), input port, output port, and polarity inversion (active-high or active-low operation) registers. Upon 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 using the polarity inversion register. All registers can be read by the system master.

Applications

• Servers
• Routers (telecom switching equipment)
• Personal computers
• Personal electronics
• Industrial automation equipment
• Products with GPIO-constrained processors

Key features

• 1 μA low standby current consumption (maximum)
• I2C to parallel port expander
• Open-drain active-low interrupt output
• 5V-tolerant I/O ports
• Compatible with most microcontrollers
• 400kHz fast I2C bus
• 3 hardware address pins for addressing up to 8 devices
• Polarity inversion register
• Latched outputs with maximum high-current drive capability for direct LED driving
• Latch-up performance exceeds 100mA, compliant with JESD 78 Class II
• ESD protection exceeds JESD 22 requirements
• 2000V Human Body Model (A114-A)
• 200V Machine Model (A115-A)
• 1000V Charged Device Model (C101)