Nexperia NCA9539PWJ

The NCA9539 provides 16-bit general-purpose I/O (GPIO) expansion for I²C bus/SMBus applications, featuring interrupt and reset functionality. It is designed for a wide voltage range of 1.65 V to 5.5 V. When additional I/O is needed while keeping interconnects to a minimum, Nexperia's GPIO expander offers an elegant solution for applications such as ACPI power switching, sensors, buttons, LEDs, and fan control. The NCA9539 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 either 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 read registers. The NCA9539 features an open-drain interrupt output that is asserted whenever any GPIO differs from its corresponding input port register state. INT can be connected to a microcontroller's interrupt input. By signaling an interrupt on this line, the remote I/O can notify the microcontroller of incoming data on its ports without requiring communication over the I²C bus. As a result, the NCA9539 can remain a simple slave device. A power-on reset sets the registers to their default values and initializes the device state machine. The RESET pin provides the same reset functionality by holding it active low, without requiring a power-down/power-up cycle. The state machine and registers remain in their default state until the RESET input returns high. This input requires a pull-up to VCC. The NCA9539 features two address pins, A0 and A1, which can be used to configure the device's I²C bus slave address, allowing up to four devices to share the same I²C bus/SMBus.

• 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 inputs allow slow input transitions with improved switching noise immunity on SCL and SDA inputs
• Typical Vhys = 0.10 × VCC
• Noise filters on SCL and SDA inputs
• 5 V tolerant I/O
• 16 I/O pins, configured as inputs at power-up
• Open-drain active-low interrupt output (INT)
• Reset input (RESET) to restore NCA9539 to default state
• 400 kHz fast-mode I²C bus
• Internal power-on reset
• Power-up glitch-free
• Latched outputs with 25 mA maximum drive capability for direct LED driving
• Latch-up performance exceeds 100 mA per JESD78 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