TI TCA9534DWT

The TCA9534 is a 16-pin device that provides 8-bit general-purpose parallel input and output (I/O) expansion for the two-wire bidirectional I²C bus (or SMBus) protocol. The device can operate over a power supply voltage range of 1.65V to 5.5V, allowing the use of various devices. The device supports clock frequencies of 100kHz (Standard Mode) and 400kHz (Fast Mode). When additional I/O is required for switches, sensors, buttons, LEDs, fans, and other similar devices, an I/O expander such as the TCA9534 provides a simple solution. Features of the TCA9534 include interrupt generation on the INT pin. This allows the host device to know when an input port has changed state. The hardware-addressable pins A0, A1, and A2 allow up to eight TCA9534 devices on the same I²C bus. The device can also be powered by cycling the power supply to generate a power-on reset, which resets the device to its default state.

• ESD protection exceeds JESD 22 specification requirements – 2000V Human Body Model (A114-A), 1000V Component Charged Model (C101)
• Low standby current consumption
• I²C to parallel port expander
• Open-drain outputs
• Active-low interrupt output
• 1.65V to 5.5V operating supply voltage range
• 5V-tolerant I/O ports
• 400kHz fast I²C bus
• 3 hardware address pins support up to 8 devices on I2C/SMBus
• Input and output configuration registers
• Polarity inversion register
• Internal power-on reset; all channels configured as inputs at power-on
• Glitch-free outputs at power-on
• Noise filter on SCL/SDA inputs
• Latched outputs with maximum high-current drive capability for direct LED driving
• Latch-up performance exceeds 100mA, compliant with JESD 78 Class II specification

• Servers
• Routers (telecom switching equipment)
• Personal computers
• Personal electronics (e.g., gaming consoles)
• Industrial automation
• Products using GPIO-constrained processors