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NXP Semiconductors PCA9535HFHP
- Part No.:
- PCA9535HFHP
- Manufacturer:
- NXP Semiconductors
- Category:
- I/O Expanders
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
PCA9535HFHP.pdf
- Description:
- IC XPND 400KHZ I2C SMBUS 24HWQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,291
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Product details
Overview
PCA9535HFHP from NXP Semiconductors is a 16-bit I²C-bus/SMBus GPIO expander with open-drain interrupt output, 2.3 V to 5.5 V supply range, 5 V-tolerant I/Os, and HWQFN24 package. It provides configurable input/output ports for system-level expansion in space-constrained industrial control interfaces.
For engineers reviewing the PCA9535HFHP datasheet, PCA9535HFHP pinout, PCA9535HFHP application, or PCA9535HFHP equivalent, key selection criteria include I²C address configurability (A0–A2), polarity inversion register support, low standby current, noise-filtered SCL/SDA inputs, and compatibility with ACPI power switches and sensor interface subsystems.
Technical Context
The PCA9535HFHP implements two independent 8-bit port registers (Port 0 and Port 1), each with dedicated configuration, input, output, and polarity inversion registers - enabling per-pin direction control and active-HIGH/LOW input inversion. Its interrupt logic activates only on state changes of pins configured as inputs, and clears upon reading the corresponding Input Port register.
It uses a standard I²C protocol with fixed 7-bit slave address (1110100b) plus three hardware address bits (A0–A2), supporting up to eight devices on one bus. Power-on reset initializes all I/Os as inputs and sets default register values, while internal noise filters on SCL/SDA improve robustness in electrically noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.3 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V systems without level shifters. |
| I/O Tolerance | 5 V tolerant - allows safe connection to 5 V peripherals even when VDD = 3.3 V. |
| Max Clock Frequency | 400 kHz - compatible with standard and fast-mode I²C buses. |
| Interrupt Output | Active LOW open-drain - requires external pull-up; asserts when any input pin state differs from its Input Port register value. |
| ESD Protection | 2000 V HBM - meets JEDEC JESD22-A114 for handling robustness in manufacturing and field use. |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial ambient conditions. |
| Package | HWQFN24 (4 × 4 × 0.75 mm) - thermally enhanced, leadless, space-efficient footprint for high-density PCB layouts. |
Pinout & Package
PCA9535HFHP is housed in a 24-terminal HWQFN package (SOT994-1) with exposed thermal pad. The package requires soldering the center pad to a PCB thermal pad with vias for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INT (22) | Interrupt output | Open-drain active LOW signal indicating input state change; requires external pull-up resistor. |
| A0, A1, A2 (18, 23, 24) | Address inputs | Set LSBs of 7-bit I²C address (1110100b + A2A1A0); enable up to eight devices on same bus. |
| IO0_0–IO0_7 (1–8) | Port 0 I/O pins | Configurable as inputs or outputs via Configuration Port 0 register; default to high-impedance inputs at power-up. |
| IO1_0–IO1_7 (10–17) | Port 1 I/O pins | Independent 8-bit port with identical configuration and register mapping as Port 0. |
| SCL (19), SDA (20) | I²C bus interface | Noise-filtered serial clock and data lines compliant with I²C-bus and SMBus specifications. |
| VDD (21), VSS (9) | Power supply | VDD powers internal logic and I/O drivers; VSS is ground reference - both must be decoupled locally. |
Key Features
| Feature | Design Value |
|---|---|
| Polarity Inversion Register | Per-bit inversion of Input Port register read data - enables software-defined active-HIGH or active-LOW sensing without external logic. |
| No Glitch on Power-Up | Internal power-on reset ensures deterministic I/O states (all inputs) and register defaults before firmware initialization. |
| Low Standby Current | Reduces system-level quiescent power - critical for battery-backed or energy-sensitive industrial nodes. |
| Configurable I/O Direction | Each of 16 pins independently set as input or output via Configuration Port registers - eliminates need for discrete direction-control logic. |
| Interrupt Latching Behavior | INT remains asserted until corresponding Input Port register is read - prevents missed edge events in polled or interrupt-driven host firmware. |
Applications
| Industrial Sensor Hub | ACPI Power Management |
|---|---|
|
Use Scenario: Aggregating signals from temperature, humidity, and motion sensors in a programmable logic controller (PLC) backplane. IC Role / Device Role / Timing Role: GPIO expander providing isolated, software-configurable digital inputs with interrupt-driven change detection. Use Value: Reduces host MCU GPIO usage by 16 pins while enabling low-latency event notification via INT line - avoids polling overhead and improves real-time responsiveness. |
Use Scenario: Managing power sequencing and status reporting for peripheral modules in embedded computing platforms compliant with ACPI 5.0+. IC Role / Device Role / Timing Role: System-level I/O extension for wake-up signaling, reset coordination, and power-good monitoring. Use Value: Enables host firmware to detect hot-plug events or fault conditions through interrupt-driven reads - supports reliable suspend/resume transitions without dedicated ASIC logic. |
| Keypad Interface Subsystem | LED Status Panel Controller |
|
Use Scenario: Scanning a 10-digit numeric keypad in a medical device front panel with EMI-hardened layout. IC Role / Device Role / Timing Role: Bidirectional I/O port with configurable pull-up/pull-down behavior and noise-filtered SCL/SDA lines. Use Value: Eliminates need for external debounce circuitry and discrete shift registers - simplifies BOM and improves EMC margin via integrated input filtering. |
Use Scenario: Driving 16 discrete status LEDs in an industrial HMI panel with shared 5 V rail and mixed-voltage logic. IC Role / Device Role / Timing Role: High-drive-capability GPIO expander with 5 V-tolerant outputs and per-port polarity inversion. Use Value: Allows direct LED anode connection to 5 V with cathodes driven by open-drain outputs - simplifies routing and enables consistent brightness control across voltage domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar GPIO expander applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9535PW,118 | TSSOP24 package (4.4 mm width); identical electrical specs and register map. | Less thermally efficient than HWQFN; suitable for prototyping or lower-power density designs. | Select PCA9535PW,118 when board space permits larger footprint and thermal requirements are relaxed. |
| PCA9555D,112 | Includes internal 100 kΩ I/O pull-up resistors; higher quiescent current when I/Os held LOW. | Eliminates need for external pull-ups in simple input configurations but increases standby power. | Choose PCA9555D,112 only if pull-up integration outweighs power budget constraints in battery-operated systems. |
Compared with PCA9535HFHP, PCA9535PW,118 offers identical functionality in a more manufacturable but thermally inferior package, while PCA9555D,112 trades off higher standby current for reduced external component count - making PCA9535HFHP optimal for compact, thermally demanding, and ultra-low-power industrial I/O expansion.
Availability
PCA9535HFHP is available at Aetrix Electronics and suitable for industrial sensor hubs, ACPI-compliant power management subsystems, and LED status panel controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for PCA9535HFHP 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 ecosystem components and embedded processing.
The PCA9535HFHP belongs to NXP's I²C-bus GPIO expander product line, designed specifically to extend microcontroller I/O capability in space-constrained, noise-immune industrial control and power management systems.
FAQ
What is the I²C address configuration method for PCA9535HFHP?
The PCA9535HFHP uses three hardware address pins (A0, A1, A2) to configure the three LSBs of its 7-bit I²C slave address, which has a fixed prefix of 1110100b. This allows up to eight PCA9535HFHP devices to share the same I²C bus without address conflict. Each combination of A0–A2 sets a unique address from 0x20 to 0x27, and no software address programming is required.
Does PCA9535HFHP support both input and output modes on the same I/O pin?
Yes, PCA9535HFHP supports bidirectional operation per pin via its Configuration Port registers (Registers 6 and 7). Each of the 16 I/Os can be individually set as input (high-impedance) or output (totem-pole) at runtime. When configured as input, the pin reflects external logic levels; when configured as output, it drives logic HIGH or LOW based on the Output Port register contents.
How does the interrupt output (INT) behave on PCA9535HFHP?
The INT pin on PCA9535HFHP is an active LOW open-drain output that asserts when any input-configured I/O pin changes state relative to its stored value in the Input Port register. The interrupt remains latched until the corresponding Input Port register (Port 0 or Port 1) is read by the master - ensuring no edge events are missed even during delayed firmware response.
Is PCA9535HFHP compatible with SMBus protocols?
Yes, PCA9535HFHP is fully SMBus 2.0 compliant. It supports SMBus Alert response, timeout detection, and packet error checking (PEC) readiness. Its noise-filtered SCL/SDA inputs, defined timing parameters, and interrupt behavior align with SMBus specification requirements for system management communication in servers and industrial platforms.
What thermal considerations apply to the HWQFN24 package of PCA9535HFHP?
The HWQFN24 package of PCA9535HFHP features an exposed thermal pad that must be soldered to a PCB copper thermal pad with multiple thermal vias. This connection is mandatory for proper thermal dissipation and electrical stability. Failure to connect the pad may result in elevated junction temperature, reduced reliability, and potential register corruption under sustained load.
PCA9535HFHP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of I/O:
- 16
- Interface:
- I2C, SMBus
- Interrupt Output:
- Yes
- Features:
- POR
- Output Type:
- Open Drain
- Current - Output Source/Sink:
- 160mA
- Clock Frequency:
- 400 kHz
- Voltage - Supply:
- 2.3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-HWQFN (4x4)
PCA9535HFHP FAQ
1.How can I place an order for PCA9535HFHP through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9535HFHP 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 PCA9535HFHP reliable?
The price and inventory of PCA9535HFHP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9535HFHP is usually 5 days.
3.What payment methods are accepted for PCA9535HFHP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9535HFHP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9535HFHP?
PCA9535HFHP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9535HFHP 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 PCA9535HFHP?
For technical support, including PCA9535HFHP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9535HFHP requirements.
6.How does Aetrix verify that PCA9535HFHP is sourced from the original manufacturer or authorized distributors?
All PCA9535HFHP 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 PCA9535HFHP meets industry standards.
7.What is the process for return or replacement of PCA9535HFHP?
All PCA9535HFHP units undergo pre-shipment inspection (PSI). If there is an issue with PCA9535HFHP, 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 PCA9535HFHP part is unused and in its original packaging.
Return procedure for PCA9535HFHP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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