I²C general-purpose I/O (GPIO)

Maximize the system design reuse with I²C GPIO Expanders

Our NCA95xx family of General-Purpose I/O (GPIO) expanders provides an elegant solution when additional I/Os are needed while keeping the interconnections to a minimum. Housed in TSSOP24 and HWQFN24, these GPIO expanders are equipped with multiple features Interrupt, Hardware RESET, Internal pull-up resistors, and configurable pull-ups. These GPIO expanders features benefits such as extremely low static power consumptions and reduces the PCB design complexity through trace reduction and routing simplification thereby reducing the BOM cost.

Key features and benefits

  • Single supply GPIO expander supporting operating power supply voltage range of 1.65 V to 5.5 V operation
  • Serial to parallel (SDA to P0-P16) and parallel to serial (P0-P16) conversion with I²C protocol
  • Schmitt-trigger action allows slow input transition and better switching noise immunity at the SCL and SDA inputs
  • Low power consumption of 2.5 µA maximum
  • 400 kHz operation (FM I²C mode)
  • 5 V tolerant I/Os and 16 I/Os pins which defaults to 16 inputs
  • Glitch free Power up with all channels configured as inputs with weak pull-up resistors
  • Latched outputs with 25 mA drive maximum capability for directly driving LEDs
  • Polarity Inversion Register
  • External RESET pin to reset state machine and internal registers
  • Noise filters on SCL and SDA inputs
  • Package offered : TSSOP24 and HWQFN24
  • Specified from -40 °C to +85 °C and -40 °C to +125 °C

Key applications

  • Servers and routers
  • TV and hardware control monitors
  • Gaming consoles and drones
  • Battery powered applications
  • Automotive applications (ADAS, VCU, DCU and BCM)
  • Surveillance cameras
  • Telecomm equipment


I²C General-Purpose I/O (GPIO)


型号 描述 状态 快速访问
NCA9555 Low-voltage 16-bit I²C and SMBus I/O expander with interrupt output and configuration registers ACT
NCA9555PW Low-voltage 16-bit I²C and SMBus I/O expander with interrupt output and configuration registers Production
Visit our documentation center for all documentation

Outline 3d (1)

文件名称 标题 类型 日期
sot355-1_3d plastic, thin shrink small outline package; 24 leads; 0.65 mm pitch; 7.8 mm x 4.4 mm x 1.1 mm body Outline 3d 2021-06-10

User manual (1)

文件名称 标题 类型 日期
UM90016 NCA95xx GPIO expander EVB (Arduino™ shield compatible) User manual 2023-01-23