×

NCA9555BY

Low-voltage 16-bit I²C and SMBus I/O expander with interrupt output and configuration registers

The NCA9555 provides 16 bits of General Purpose Input/Output (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 and default pull-up resistors on GPIOs. Nexperia GPIO expanders provide 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 NCA9555 contains a set of 8 bit 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 input register. The NCA9555 has an open-drain interrupt output which is activated when any one of the GPIO changes from its corresponding input port register state. The power on reset sets the registers to default values and initializes the device state machine. The NCA9555 has three address pins A0, A1 and A2 which can be used to configure the I²C bus slave address of the device. It allows up-to eight devices to share the same I²C-bus/SMBus.

Features and benefits

  • I²C-bus to parallel port expander

  • Operating power supply voltage range of 1.65 V to 5.5 V

  • Low standby current consumption:

    • 2.5 µA (maximum)

  • Schmitt-trigger action allows slow input transition and better switching noise immunity at the SCL and SDA inputs

    • Vhys = 0.10 × VCC (typical)

    • Noise filter on SCL and SDA inputs

  • 5 V tolerant I/Os

  • 16 I/O pins which power up configured in input state with weak pull-up resistor

  • Open-drain active LOW interrupt output (INT)

  • 400 kHz Fast-mode I²C-bus

  • Internal power-on reset

  • No glitch on power-up

  • Latched outputs with 25 mA drive maximum capability for directly driving LEDs

  • 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

  • Specified from -40 °C to +85 °C

Parametrics

Type number Product status VCC (V) Logic switching levels Power dissipation considerations Tamb (°C) Package name
NCA9555BY Production 1.65 - 5.5 CMOS low -40~85 HWQFN24

Package

Type number Orderable part number, (Ordering code (12NC)) Status Marking Package Package information Reflow-/Wave soldering Packing
NCA9555BY NCA9555BYHP
(935691298128)
Active NCA9555 SOT8041-1
HWQFN24
(SOT8041-1)
SOT8041-1 SOT8041-1_128

Boards

Part number Description Type Quick links Shop link
Description
NEVB – NCA9555, the NCA95xx evaluation board, is an Arduino™ compatible shield form factor PCB designed for the Nexperia I²C controlled GPIO expander family. The board provides convenient test points for GND, I²C-Bus signals SCL and SDA as well as an interrupt open drain output. The EVB can be used for the GPIO expander derivatives NCA9555, NCA9535, NCA9539 and NCA9595.
Type
Evaluation board
Quick links
Shop link

Environmental information

Type number Orderable part number Chemical content RoHS RHF-indicator
NCA9555BY NCA9555BYHP NCA9555BY rohs rhf rhf
Quality and reliability disclaimer

Documentation (11)

File name Title Type Date
NCA9555 Low-voltage 16-bit I²C and SMBus I/O expander with interrupt output and configuration registers Data sheet 2023-04-24
AN90044 A study of I2C with examples Application note 2023-07-03
nca9555 NCA9555 IBIS model IBIS model 2023-01-09
Nexperia_document_leaflet_I2C_GPIO_expanders I2C GPIO Expanders 2023 Leaflet 2023-04-26
SOT8041-1 plastic thermal enhanced very very thin Quad Flat packages, no leads;24 terminals; 0.5 mm pitch; 4 x 4 x 0.75 mm body Package information 2023-03-17
SOT8041-1_128 QFN4x4 24L; Reel pack for SMD, 13"; Q2/T3 product orientation Packing information 2022-08-01
NCA9555BY_Nexperia_Product_Reliability NCA9555BY Nexperia Product Reliability Quality document 2023-05-29
NCA95XX_Arduino_Sketches NCA95XX Arduino™ Sketch Examples Software 2023-03-12
NCA95XX_EVB_Software NCA95XX EVB GUI Software 2023-03-12
UM90016 NCA95xx GPIO expander EVB (Arduino™ shield compatible) User manual 2024-02-23
UM90017 NCA95XX Evaluation Board: Quick-Start Guide User manual 2023-01-18

Support

If you are in need of design/technical support, let us know and fill in the answer form we'll get back to you shortly.

Models

File name Title Type Date
nca9555 NCA9555 IBIS model IBIS model 2023-01-09

Ordering, pricing & availability

Type number Orderable part number Ordering code (12NC) Status Packing Packing Quantity Buy online
NCA9555BY NCA9555BYHP 935691298128 Active SOT8041-1_128 3,000 Order product

Sample

As a Nexperia customer you can order samples via our sales organization or directly via our Online Sample Store: https://extranet.nexperia.com.

Sample orders normally take 2-4 days for delivery.

If you do not have a direct account with Nexperia our network of global and regional distributors is available and equipped to support you with Nexperia samples.

How does it work?

The interactive datasheets are based on the Nexperia MOSFET precision electrothermal models. With our interactive datasheets you can simply specify your own conditions interactively. Start by changing the values of the conditions. You can do this by using the sliders in the condition fields. By dragging the sliders you will see how the MOSFET will perform at the new conditions set.

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
NCA9555BY NCA9555BYHP 935691298128 SOT8041-1 Order product