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NXP Semiconductors PCA9674PW/S911,118
- Part No.:
- PCA9674PW/S911,118
- Manufacturer:
- NXP Semiconductors
- Category:
- I/O Expanders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PCA9674PW/S911,118.pdf
- Description:
- IC XPNDR 1MHZ I2C 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,053
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Product details
Overview
PCA9674PW/S911,118 from NXP Semiconductors is an 8-bit quasi-bidirectional I²C-bus I/O expander with Fast-mode Plus (1 MHz) interface, active-low open-drain interrupt output (INT), and 25 mA per-port sink capability for direct LED driving. It operates from 2.3 V to 5.5 V, features 3 hardware address pins enabling up to 64 slave addresses, and includes internal Power-On Reset initializing all I/Os as inputs with 100 µA weak pull-up.
For engineers reviewing the PCA9674PW/S911,118 datasheet, PCA9674PW/S911,118 pinout, PCA9674PW/S911,118 application, or PCA9674PW/S911,118 equivalent, this device is selected for remote I/O expansion in space-constrained industrial control, LED signage, and embedded systems requiring low standby current (4.5 µA typical), high bus drive (30 mA SDA sink), and interrupt-driven input monitoring without polling.
Technical Context
The PCA9674PW/S911,118 implements a quasi-bidirectional I/O architecture-no direction register required-where each of the eight ports (P0–P7) functions as input or output based on register write value and external signal state. Input mode uses a 100 µA internal pull-up; output LOW activates a strong sink transistor (25 mA), while output HIGH enables a transient 1/2-cycle accelerator pull-up for faster rise time into capacitive loads.
It supports Fm+ I²C-bus operation at up to 1 MHz, with SDA capable of sinking 30 mA into 4000 pF buses, eliminating need for bus buffers in multi-device configurations. The INT pin asserts low when any input port state differs from its corresponding register value, enabling efficient event-driven microcontroller wake-up without continuous polling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C Bus Speed | 1 MHz Fast-mode Plus (Fm+) - enables high-throughput I/O updates in real-time LED dimming and sensor polling applications. |
| Supply Voltage Range | 2.3 V to 5.5 V - supports direct integration with 3.3 V and 5 V logic domains; I/Os are 5.5 V tolerant when held to VDD. |
| Quasi-bidirectional I/O Count | 8 ports (P0–P7) - each independently configurable as input or output via single data register; no direction register overhead. |
| Output Sink Current | 25 mA per port - sufficient to directly drive standard LEDs without external drivers or current-limiting transistors. |
| Interrupt Output | Active-low open-drain INT - signals input state change to MCU; eliminates polling, reducing system power and firmware complexity. |
| Standby Current | 4.5 µA typical (static) - optimized for battery-powered mobile devices and always-on industrial sensors. |
| Address Pins | 3 hardware-selectable pins (AD0–AD2) - decode to 64 unique slave addresses, supporting dense I/O expansion (up to 1008 I/Os on one bus). |
Pinout & Package
TSSOP16 package (SOT403-1): 4.4 mm body width, 16-lead thin shrink small outline, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 AD0 | Slave address input 0 | Hardware-configurable bit for 7-bit I²C slave address; combined with AD1/AD2 to select 1 of 64 addresses. |
| 2 AD1 | Slave address input 1 | Second address bit; externally tied to VDD/VSS/SDA/SCL to expand address space beyond binary encoding. |
| 3 AD2 | Slave address input 2 | Third address bit; enables non-overlapping address ranges between PCA9674 and PCA9674A variants. |
| 4 P0 | Quasi-bidirectional I/O 0 | Port 0 - functions as input (with 100 µA pull-up) or output (25 mA sink) based on register value; no direction register needed. |
| 5 P1 | Quasi-bidirectional I/O 1 | Port 1 - identical behavior to P0; supports mixed input/output configuration across the 8-port bank. |
| 6 P2 | Quasi-bidirectional I/O 2 | Port 2 - used for keypad scanning, LED anode/cathode control, or status monitoring in compact designs. |
| 7 P3 | Quasi-bidirectional I/O 3 | Port 3 - compatible with 5 V-tolerant signaling when VDD = 3.3 V, simplifying level-shifting in mixed-voltage systems. |
| 8 VSS | Supply ground | Primary ground reference; must be connected to system GND; no internal ESD protection tie to exposed pad in TSSOP16. |
| 9 P4 | Quasi-bidirectional I/O 4 | Port 4 - supports interrupt-triggered readback; state change on P4 asserts INT if configured as input. |
| 10 P5 | Quasi-bidirectional I/O 5 | Port 5 - latched output retains state during I²C bus arbitration or master reset; ensures deterministic LED/relay control. |
| 11 P6 | Quasi-bidirectional I/O 6 | Port 6 - high-current sink allows direct connection to common-cathode LED arrays without external FETs. |
| 12 P7 | Quasi-bidirectional I/O 7 | Port 7 - last port in byte-aligned register; enables full 8-bit parallel-to-serial conversion in minimal footprint. |
| 13 INT | Interrupt output | Active-low open-drain - requires external pull-up; asserts when any input port differs from its mirrored register value. |
| 14 SCL | I²C serial clock | Input-only clock line; synchronized to master; supports 1 MHz timing with standard I²C electrical specs. |
| 15 SDA | I²C serial data | Bi-directional data line with 30 mA sink capability - drives heavy bus capacitance (4000 pF) without repeaters. |
| 16 VDD | Supply voltage | Power input (2.3–5.5 V); powers internal logic, pull-ups, and output drivers; 5.5 V tolerant I/Os referenced to this rail. |
Key Features
| Feature | Design Value |
|---|---|
| Fm+ I²C interface | 1 MHz operation enables rapid I/O updates for PWM LED dimming and responsive keypad scanning. |
| Quasi-bidirectional I/O architecture | Eliminates direction register overhead and simplifies firmware - single-byte read/write controls all 8 ports. |
| 25 mA per-port sink capability | Directly drives standard LEDs, relays, or logic inputs without external driver components or PCB area. |
| Active-low open-drain interrupt | Reduces MCU polling overhead and system power by signaling input changes asynchronously. |
| 64 programmable slave addresses | Supports scalable I/O expansion - up to 126 PCA9674/74A devices on one bus (1008 total I/Os). |
| Software Reset via General Call | Restores all registers to Power-On Reset state using standardized I²C command (00h + 06h), enabling remote recovery. |
Applications
| LED Signage & Displays | Industrial Control Panels |
|---|---|
Use Scenario: Driving 8-segment alphanumeric displays and RGB LED matrices in outdoor signage with limited microcontroller GPIO. IC Role / Device Role / Timing Role: Remote I/O expander providing parallel output control over I²C; handles PWM dimming synchronization via fast 1 MHz bus. Use Value: Reduces host MCU pin count and firmware complexity while delivering 25 mA per segment for bright, uniform illumination without external drivers. |
Use Scenario: Monitoring pushbutton/keypad inputs and controlling indicator LEDs on PLC operator interfaces. IC Role / Device Role / Timing Role: Quasi-bidirectional port expander with interrupt-driven input capture; INT pin wakes MCU only on keypress. Use Value: Cuts idle power consumption by >95% vs polling; 100 µA pull-up ensures reliable key detection in noisy factory environments. |
| Medical Instrumentation | Mobile Device Peripherals |
Use Scenario: Managing status indicators, sensor enable lines, and safety interlock signals in portable diagnostic equipment. IC Role / Device Role / Timing Role: Low-power I/O hub interfacing between ARM Cortex-M host and analog front-end peripherals. Use Value: 4.5 µA standby current extends battery life; 2.3–5.5 V operation supports single-cell Li-ion (3.0–4.2 V) and regulated 3.3 V rails. |
Use Scenario: Expanding GPIO for accessory detection, LED notification, and button control in smartphones and wearables. IC Role / Device Role / Timing Role: Space-optimized TSSOP16 I/O extender with minimal board footprint and no external passives required. Use Value: TSSOP16 package (4.4 mm width) fits tight mobile layouts; 5.5 V-tolerant I/Os simplify integration with diverse peripheral voltage domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I/O expansion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9674APW,118 | Identical functionality and pinout, but uses non-overlapping 62-address range (excludes 00h and F8h); incompatible slave address map. | Suitable only where address collision with legacy PCA9674 devices must be avoided in multi-expander systems. | Select PCA9674APW,118 when deploying new designs alongside existing PCA9674-based systems to prevent I²C address conflicts. |
| PCA9672D,118 | 8-bit I/O expander with identical TSSOP16 package and 25 mA sink, but limited to standard-mode I²C (400 kHz) and no Software Reset or Device ID. | Lacks interrupt output and Fm+ speed; not suitable for high-refresh LED control or event-driven input monitoring. | Choose PCA9672D,118 only for cost-sensitive, low-speed applications where interrupt and 1 MHz bus are unnecessary. |
Compared with PCA9674APW,118, the PCA9674PW/S911,118 offers broader address compatibility (64 vs 62 options) and supports General Call Software Reset; versus PCA9672D,118, it delivers 2.5× faster I²C throughput and critical interrupt-driven operation for responsive human-interface systems.
Availability
PCA9674PW/S911,118 is available at Aetrix Electronics and suitable for LED signage, industrial control panels, and medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for PCA9674PW/S911,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with leadership in I²C interface IP and low-power mixed-signal design.
The PCA9674 product line targets space- and power-constrained embedded systems needing robust, interrupt-capable I/O expansion over standard two-wire buses - designed specifically for LED control, keypad scanning, and industrial HMI subsystems.
FAQ
What is the maximum I²C bus speed supported by the PCA9674PW/S911,118?
The PCA9674PW/S911,118 supports Fast-mode Plus (Fm+) I²C operation up to 1 MHz. This enables high-speed data transfer for time-critical applications like LED PWM dimming and rapid input state polling. Its SDA line can sink 30 mA, allowing reliable communication even on heavily loaded buses with up to 4000 pF capacitance - eliminating the need for bus buffers in multi-device systems.
How does the quasi-bidirectional I/O architecture of the PCA9674PW/S911,118 differ from standard GPIO expanders?
Unlike conventional expanders requiring separate direction registers, the PCA9674PW/S911,118 uses a quasi-bidirectional architecture where each port (P0–P7) functions as input or output based solely on the value written to the single data register. Writing '1' configures the pin as input (with 100 µA pull-up); writing '0' activates a 25 mA sink for output LOW. This reduces firmware overhead and eliminates direction register management.
Can the PCA9674PW/S911,118 directly drive LEDs, and what is its per-port current capability?
Yes, the PCA9674PW/S911,118 can directly drive LEDs with 25 mA sink current per port (P0–P7), sufficient for standard indicator and signage LEDs. Its total package sink capability is 200 mA, allowing simultaneous drive of multiple LEDs. No external transistors or current-limiting resistors are needed on the sink side - only a series resistor on the LED anode when connected to VDD.
What is the function of the INT pin on the PCA9674PW/S911,118, and how is it used?
The INT pin on the PCA9674PW/S911,118 is an active-low open-drain interrupt output that asserts when any input port's physical state differs from its corresponding register value. It connects directly to a microcontroller's external interrupt input, enabling event-driven wake-up instead of periodic polling. This reduces system power consumption and firmware latency in applications like keypad scanning and sensor monitoring.
Does the PCA9674PW/S911,118 support software reset, and how is it executed?
Yes, the PCA9674PW/S911,118 supports Software Reset via the I²C General Call address (00h). The sequence is: START → 00h (write) → ACK → 06h → ACK → STOP. Upon successful execution, all registers revert to Power-On Reset values (I/Os as inputs with 100 µA pull-up). This enables remote recovery without hardware reset, critical for unattended industrial and medical systems.
PCA9674PW/S911,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of I/O:
- 8
- Interface:
- I2C
- Interrupt Output:
- Yes
- Features:
- POR
- Output Type:
- Push-Pull
- Current - Output Source/Sink:
- 100µA, 25mA
- Clock Frequency:
- 1 MHz
- Voltage - Supply:
- 2.3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
PCA9674PW/S911,118 FAQ
1.How can I place an order for PCA9674PW/S911,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9674PW/S911,118 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PCA9674PW/S911,118 reliable?
The price and inventory of PCA9674PW/S911,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9674PW/S911,118 is usually 5 days.
3.What payment methods are accepted for PCA9674PW/S911,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9674PW/S911,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9674PW/S911,118?
PCA9674PW/S911,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9674PW/S911,118 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PCA9674PW/S911,118?
For technical support, including PCA9674PW/S911,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9674PW/S911,118 requirements.
6.How does Aetrix verify that PCA9674PW/S911,118 is sourced from the original manufacturer or authorized distributors?
All PCA9674PW/S911,118 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PCA9674PW/S911,118 meets industry standards.
7.What is the process for return or replacement of PCA9674PW/S911,118?
All PCA9674PW/S911,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9674PW/S911,118, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PCA9674PW/S911,118 part is unused and in its original packaging.
Return procedure for PCA9674PW/S911,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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