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NCA9539BY

Low-voltage 16-bit I²C and SMBus low-power I/O expander with interrupt output, reset pin and configuration registers

The NCA9539 provides 16 bits of General Purpose Input/Output (GPIO) expansion with interrupt and reset for I²C-bus/SMBus applications. It is designed for a wide voltage range of 1.65 V to 5.5 V. 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 NCA9539 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 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. INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I²C-bus. Thus, NCA9539 can remain a simple slave. The power on reset sets the registers to default values and initializes the device state machine. The RESET pin can be used to achieve same reset functionality without power down/up cycling by keeping active low. The state machine and the registers are in their default state until the RESET input is once again HIGH. This input requires pull up to VCC. The NCA9539 has two address pins A0 and A1 which can be used to configure the I²C bus slave address of the device. It allows up-to four 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
  • Open-drain active LOW interrupt output (INT)

  • Reset input for resetting NCA9539 to default values (RESET)

  • 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

  • Packages offered: TSSOP24 and HWQFN24

  • Specified from -40 °C to +85 °C

Parametrics

Type number VCC (V) Logic switching levels Power dissipation considerations Tamb (°C) Package name
NCA9539BY 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
NCA9539BY NCA9539BYHP
(935691548128)
Active NCA9539 SOT8041-1
HWQFN24
(SOT8041-1)
SOT8041-1 SOT8041-1_128

Environmental information

Type number Orderable part number Chemical content RoHS RHF-indicator
NCA9539BY NCA9539BYHP NCA9539BY rohs rhf rhf
Quality and reliability disclaimer

Documentation (10)

File name Title Type Date
NCA9539 Low-voltage 16-bit I²C and SMBus low-power I/O expander with interrupt output, reset pin and configuration registers Data sheet 2024-08-05
AN90044 A study of I2C with examples Application note 2023-07-03
nca9539 NCA9539 IBIS model IBIS model 2023-04-07
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 2024-04-23
SOT8041-1_128 QFN4x4 24L; Reel pack for SMD, 13"; Q2/T3 product orientation Packing information 2022-08-01
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

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Models

File name Title Type Date
nca9539 NCA9539 IBIS model IBIS model 2023-04-07

Ordering, pricing & availability

Type number Orderable part number Ordering code (12NC) Status Packing Packing Quantity Buy online
NCA9539BY NCA9539BYHP 935691548128 Active SOT8041-1_128 3,000 Order product

Sample

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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
NCA9539BY NCA9539BYHP 935691548128 SOT8041-1 Order product