NCA9535PWJ

The NCA9535 provides 16-bit general-purpose I/O (GPIO) expansion for I²C bus/SMBus applications. It is designed for a wide voltage range of 1.65 V to 5.5 V with interrupt capability. Nexperia's GPIO expanders offer an elegant solution in applications such as ACPI power switches, sensors, buttons, LEDs, and fan control, where additional I/O is required while keeping interconnections to a minimum. The NCA9535 contains a set of 8-bit input, output, configuration, and polarity inversion registers. Upon power-up, all I/Os default to inputs. Each I/O can be configured as an input or output by changing the corresponding bit in the configuration register. Data for each input or output is stored in the corresponding input or output register. The polarity inversion register can be programmed to invert the polarity of the input registers. The NCA9535 features an open-drain interrupt output that is asserted whenever any GPIO changes state from its corresponding input port register. A power-on reset sets all registers to their default values and initializes the device state machine. The NCA9535 has three address pins — A0, A1, and A2 — which can be used to configure the I²C bus slave address of the device, allowing up to eight devices to share the same I²C bus/SMBus.

Key features

• I²C bus to parallel port expander
• Operating supply voltage range: 1.65 V to 5.5 V
• Low standby current consumption: 2.5 μA maximum
• Schmitt-trigger action allows slow input transitions on SCL and SDA inputs with improved switching noise immunity, typical Vhys = 0.10 × VCC
• Noise filter on SCL and SDA inputs
• 5 V tolerant I/O
• 16 I/O pins, configured as inputs on power-up
• Open-drain active-low interrupt output (INT)
• 400 kHz fast-mode I²C bus
• Internal power-on reset
• Glitch-free power-up
• Latched outputs with 25 mA maximum drive capability for direct LED driving
• Latch-up performance exceeds 100 mA per JESD78 standard, Class II
• ESD protection: HBM ANSI/ESDA/JEDEC JS-001 Class 2 exceeds 2000 V; CDM ANSI/ESDA/JEDEC JS-002 Class C3 exceeds 1000 V
• Available packages: TSSOP24 and HWQFN24
• Operating temperature range: -40°C to +85°C