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NXP Semiconductors PCA9535BS1,118
- Part No.:
- PCA9535BS1,118
- Manufacturer:
- NXP Semiconductors
- Category:
- I/O Expanders
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
PCA9535BS1,118.pdf
- Description:
- IC XPND 400KHZ I2C SMBUS 24HWQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,654
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Product details
Overview
PCA9535BS1,118 from NXP Semiconductors is a 16-bit I²C-bus/SMBus GPIO expander in HVQFN24 package, featuring 5 V-tolerant I/Os, active LOW open-drain interrupt output, individual I/O direction configuration, and polarity inversion registers. It operates from 2.3 V to 5.5 V supply and supports up to 400 kHz clock frequency for embedded I/O expansion in space-constrained industrial control interfaces.
For engineers reviewing the PCA9535BS1,118 datasheet, PCA9535BS1,118 pinout, PCA9535BS1,118 application, or PCA9535BS1,118 equivalent, this page delivers verified electrical parameters, validated HVQFN24 pin mapping, confirmed register-level I/O configuration behavior, and real-world use cases for ACPI-compliant peripheral interfacing, LED/fan control, and sensor input aggregation.
Technical Context
The PCA9535BS1,118 implements two independent 8-bit I/O ports (Port 0 and Port 1), each with dedicated Configuration, Input, Output, and Polarity Inversion registers. Its I²C slave address is programmable via A0–A2 pins (1110100X binary base), supporting up to eight devices on one bus.
Each I/O defaults to high-impedance input at power-on reset; outputs drive totem-pole logic levels with no internal pull-ups-reducing standby current versus PCA9555. The INT pin asserts when any configured input changes state relative to its Input Port register value, and deasserts upon reading the corresponding port register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I/O Count | 16 bidirectional pins (8 per port), individually configurable as input or output via Configuration registers |
| Supply Voltage | 2.3 V to 5.5 V - enables direct interface 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 |
| I²C Speed | 0 Hz to 400 kHz - compatible with standard and fast-mode I²C buses |
| Interrupt Logic | Active LOW open-drain INT - requires external pull-up; asserts on input state change vs. Input Port register |
| ESD Rating | 2000 V HBM - meets industrial-grade robustness requirements per JESD22-A114 |
| Power-On Reset | Internal POR circuit initializes all registers to default states (I/Os = inputs, outputs = 0xFF, polarity = 0x00) |
Pinout & Package
HVQFN24 package (SOT616-1), 4 mm × 4 mm × 0.85 mm body, thermally enhanced with exposed center pad connected to VSS. Requires soldering of exposed pad to PCB thermal pad with vias for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IO0_0–IO0_7 | Port 0 I/O pins | Configurable as input (high-Z) or output (totem-pole); support 5 V tolerance regardless of VDD |
| IO1_0–IO1_7 | Port 1 I/O pins | Functionally identical to Port 0; independent register set enables asymmetric configuration |
| A0, A1, A2 | Address inputs | Set LSBs of 7-bit I²C address (base 1110100b); enable up to eight devices on same bus |
| SCL / SDA | I²C serial interface | Compliant with I²C-bus specification; includes noise filtering on both inputs |
| INT | Interrupt output | Open-drain, active LOW signal indicating input state change; cleared by reading affected Input Port register |
| VDD / VSS | Power supply | VDD: 2.3–5.5 V; VSS: ground reference tied to exposed thermal pad for thermal/electrical stability |
Key Features
| Feature | Design Value |
|---|---|
| No internal I/O pull-ups | Eliminates ~10 µA per pin standby current when I/Os held LOW - critical for battery-powered systems |
| Polarity Inversion registers | Per-pin inversion of Input Port read data - simplifies firmware handling of active-HIGH/active-LOW sensors without software XOR |
| Individual I/O configuration | Each of 16 pins independently set as input or output via Configuration registers - enables mixed-mode peripheral interfacing |
| Glitch-free power-up | Internal POR ensures deterministic register initialization and prevents spurious I/O transitions during power ramp |
| Hardware address selection | Three address pins (A0–A2) allow eight unique I²C addresses - supports multi-device I/O expansion without software address remapping |
Applications
| Industrial Human-Machine Interface | ACPI Power Management Subsystem |
|---|---|
Use Scenario: 10-digit numeric keypad and status LEDs connected to a microcontroller with limited GPIO. IC Role / Device Role / Timing Role: PCA9535BS1,118 acts as I²C-connected GPIO extender, scanning keypad rows/columns and driving LEDs under host MCU control. Use Value: Reduces host MCU pin count requirement by 16; enables shared I²C bus with other peripherals while maintaining deterministic interrupt-driven keypress detection. | Use Scenario: Monitoring push buttons, temperature sensors, and fan tachometer signals in an ACPI-compliant embedded controller. IC Role / Device Role / Timing Role: PCA9535BS1,118 serves as system-level I/O aggregator, providing interrupt-driven notification of button press or sensor threshold crossing. Use Value: Eliminates polling overhead; INT pin wake-up capability reduces host processor active time and system power consumption. |
| LED and Fan Control Module | Multi-Sensor Data Acquisition Node |
Use Scenario: Driving 8 LEDs and monitoring 4 fan RPM signals in a network appliance chassis. IC Role / Device Role / Timing Role: PCA9535BS1,118 configures half its I/Os as outputs (LED anodes to VDD via current-limiting resistors) and half as inputs (fan tach pulses). Use Value: Single-chip solution replaces discrete buffers and logic; 5 V-tolerant inputs safely accept 5 V fan tach signals even when VDD = 3.3 V. | Use Scenario: Aggregating digital outputs from ambient light, humidity, and motion sensors in a smart building node. IC Role / Device Role / Timing Role: PCA9535BS1,118 reads asynchronous sensor status bits and reports changes via INT to host MCU over I²C. Use Value: Enables event-driven sensor polling instead of continuous bus traffic; polarity inversion registers accommodate mixed active-HIGH/active-LOW sensor outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar GPIO expander applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9555BS,118 | Includes internal 100 kΩ I/O pull-up resistors; higher standby current when I/Os held LOW | Preferred where weak pull-ups simplify external circuitry but not suitable for ultra-low-power designs | Select PCA9535BS1,118 when minimizing quiescent current is critical; choose PCA9555BS,118 only if internal pull-ups eliminate required external components |
| TCA9535PWR | TI part with identical 16-bit I²C GPIO architecture, same pinout, and compatible register map; supports 1.65–5.5 V operation | Drop-in replacement in most designs; requires validation of INT timing and noise filter behavior per application | Use TCA9535PWR only after confirming compatibility with existing firmware register access sequences and interrupt latency requirements |
Compared with PCA9555BS,118, PCA9535BS1,118 reduces standby current by eliminating internal pull-ups; compared with TCA9535PWR, it shares functional equivalence but requires verification of SMBus timeout behavior and thermal pad layout compliance in HVQFN24 footprint.
Availability
PCA9535BS1,118 is available at Aetrix Electronics and suitable for industrial human-machine interfaces, ACPI power management subsystems, and LED/fan control modules requiring stable component supply across extended temperature ranges (−40 °C to +85 °C).
Supply support for PCA9535BS1,118 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 headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The PCA9535 product line delivers low-power, I²C-compatible GPIO expansion for resource-constrained embedded systems where board space, power budget, and interrupt-driven responsiveness are critical design constraints.
FAQ
What is the I²C address range supported by PCA9535BS1,118?
The PCA9535BS1,118 uses a fixed 7-bit base address of 0x20 (1110100b) with three hardware-selectable LSBs (A0–A2), yielding eight possible addresses from 0x20 to 0x27. This allows up to eight PCA9535BS1,118 devices on a single I²C bus without address conflict. The PCA9535BS1,118 does not support software-configurable addressing beyond this hardware scheme.
Does PCA9535BS1,118 include internal pull-up resistors on its I/O pins?
No, the PCA9535BS1,118 explicitly omits internal I/O pull-up resistors - a key distinction from the PCA9555 family. This design choice reduces standby current when I/Os are held LOW, making PCA9535BS1,118 suitable for battery-powered applications. External pull-ups must be added where required for open-drain signaling or bus termination.
How does the INT pin on PCA9535BS1,118 behave during I/O state changes?
The INT pin on PCA9535BS1,118 is an active LOW open-drain output that asserts when any I/O configured as an input changes state relative to its corresponding bit in the Input Port register. It deasserts only when the affected Input Port register is read - reading Port 0 clears only Port 0 interrupts, and Port 1 must be read separately to clear its interrupts.
Can PCA9535BS1,118 operate with a 3.3 V supply while interfacing with 5 V peripherals?
Yes, the PCA9535BS1,118 supports 5 V-tolerant I/Os across its full operating supply range (2.3 V to 5.5 V). When VDD = 3.3 V, all 16 I/O pins safely accept input voltages up to 5.5 V, enabling direct connection to 5 V sensors, switches, or logic without external level shifters - a verified feature per NXP's PCA9535_PCA9535C datasheet Rev. 6.
What is the function of the Polarity Inversion registers in PCA9535BS1,118?
The Polarity Inversion registers (addresses 4 and 5) in PCA9535BS1,118 allow per-bit inversion of data read from the Input Port registers. Writing '1' to a bit inverts the corresponding input bit's polarity in the read result; writing '0' retains native polarity. This eliminates firmware XOR operations when interfacing with active-HIGH or active-LOW sensors sharing the same port.
PCA9535BS1,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Number of I/O:
- 16
- Interface:
- I2C, SMBus
- Interrupt Output:
- Yes
- Features:
- POR
- Output Type:
- Push-Pull
- Current - Output Source/Sink:
- 10mA, 25mA
- 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)
PCA9535BS1,118 FAQ
1.How can I place an order for PCA9535BS1,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9535BS1,118 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 PCA9535BS1,118 reliable?
The price and inventory of PCA9535BS1,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9535BS1,118 is usually 5 days.
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PCA9535BS1,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9535BS1,118 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 PCA9535BS1,118?
For technical support, including PCA9535BS1,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9535BS1,118 requirements.
6.How does Aetrix verify that PCA9535BS1,118 is sourced from the original manufacturer or authorized distributors?
All PCA9535BS1,118 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 PCA9535BS1,118 meets industry standards.
7.What is the process for return or replacement of PCA9535BS1,118?
All PCA9535BS1,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9535BS1,118, 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 PCA9535BS1,118 part is unused and in its original packaging.
Return procedure for PCA9535BS1,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9535BS1,118 Tags
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PCF8574ADWR
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