NCA9539BYHP

NCA9539BYHP is a low-voltage 16-bit I²C and SMBus low-power I/O expander with interrupt output, reset pin and configuration registers. It is designed for a wide voltage range of 1.65V to 5.5V. Nexperia GPIO expander provides an elegant solution when additional IOs are needed while keeping the interconnections to a minimum, for example, in ACPI power switches, sensors, push buttons, LEDs and fan control. The NCA9539 contains a set of 8bit input, output, configuration and polarity inversion registers. At power up all IOs default to inputs. Each IO can be configured as either input or output by changing the corresponding bit in the configuration register. The 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 register. The NCA9539 has an open drain interrupt output which is activated when any one of the GPIO changes from its corresponding input port register state.

• I²C-bus to parallel port expander, internal power-on reset, no glitch on power-up
• Operating power supply voltage range from 1.65V to 5.5V
• Low standby current consumption is 2.5µA max (VCC = 3.6V to 5.5V)
• Transient thermal impedance from junction to ambient is 32.6K/W max
• Schmitt-trigger action allows slow i/p transition and better switching noise immunity at SCL/SDA i/p
• Vhys = 0.10 × VCC (typical), noise filter on SCL and SDA inputs
• 5V tolerant I/Os, 16 I/O pins which power up configured in input state
• Open-drain active LOW interrupt output (INT, active low)
• Reset input for resetting NCA9539 to default values (RESET, active low)
• HWQFN24 package, temperature range from -40°C to +85°C