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Texas Instruments PCA9534ADW
- Part No.:
- PCA9534ADW
- Manufacturer:
- Texas Instruments
- Category:
- I/O Expanders
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
PCA9534ADW.pdf
- Description:
- IC XPNDR 400KHZ I2C SMBUS 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,910
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Product details
Overview
PCA9534ADW from Texas Instruments is an 8-bit I²C/SMBus remote I/O expander with interrupt output, operating from 2.3 V to 5.5 V, supporting 400-kHz Fast Mode I²C, featuring open-drain active-low INT, 5-V-tolerant I/Os, and low standby current (≤1 μA). It enables microcontroller GPIO expansion in space-constrained industrial control panels.
For engineers reviewing the PCA9534ADW datasheet, PCA9534ADW pinout, PCA9534ADW application, or PCA9534ADW equivalent, this page delivers verified electrical specs, SOIC-16 package mapping, I/O configuration register behavior, interrupt timing (tiv = 4 μs), and real-world use cases for embedded I²C peripheral expansion.
Technical Context
The PCA9534ADW implements a synchronous I²C slave interface with internal power-on reset (VPORR = 1.2–1.5 V, VPORF = 0.75–1.0 V) and noise-filtered SCL/SDA inputs. Its register map includes 8-bit configuration, input port, output port, and polarity inversion registers - all accessible via standard I²C read/write sequences.
Each of the eight bidirectional I/O pins (P0–P7) supports push-pull output drive (IOL = 25 mA max per pin, 200 mA total), 5-V tolerance, and configurable input/output direction. The open-drain INT output asserts when any input state differs from its corresponding input port register value, enabling efficient event-driven host polling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V microcontrollers without level shifters. |
| I²C Speed | 400 kHz Fast Mode - enables high-throughput GPIO status updates without bus congestion in multi-device systems. |
| Standby ICC | ≤1 μA at 5.5 V - extends battery life in always-on IoT sensor nodes and portable diagnostics equipment. |
| I/O Drive | 25 mA sink per pin (P0–P7) - sufficient to directly drive LEDs or small relays without external drivers. |
| Interrupt Latency | tiv = 4 μs - ensures rapid notification of input changes for time-critical edge detection in PLC I/O modules. |
| ESD Rating | HBM ±2000 V - meets industrial-grade robustness requirements for field-deployable control hardware. |
| Address Pins | A0–A2 - allow up to eight PCA9534ADW devices on one I²C bus (0111xxx address format). |
Pinout & Package
PCA9534ADW is packaged in SOIC-16 (DW package), 10.3 mm × 6.2 mm body size, with gull-wing leads compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | I²C address LSB | Hardwired to GND/VCC to set bit 0 of 7-bit slave address (0111xxx); enables multi-drop bus configuration. |
| A1 | I²C address mid-bit | Hardwired to GND/VCC to set bit 1 of slave address; three pins yield eight unique addresses (0x38–0x3F). |
| A2 | I²C address MSB | Hardwired to GND/VCC to set bit 2; full address range allows coexistence with PCA9534 (0100xxx) on same bus. |
| P0–P7 | Bidirectional I/O port | Configurable as input or output via Configuration Register; latched outputs support LED driving; 5-V tolerant. |
| GND | Power ground reference | Common return path for VCC and all I/O currents; must be low-impedance to maintain noise immunity. |
| VCC | Supply voltage input | 2.3–5.5 V logic supply; powers internal logic, I/O buffers, and interrupt circuitry; decoupling capacitor required. |
| SDA | I²C serial data line | Open-drain bidirectional bus line; requires external pull-up resistor (typically 4.7 kΩ) to VCC. |
| SCL | I²C serial clock line | Open-drain clock input; synchronized with master; noise filtering prevents false triggering during EMI events. |
| INT | Active-low interrupt output | Open-drain signal asserted when input state ≠ input port register; connects to MCU IRQ pin with pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Internal power-on reset | Guarantees known I/O state (all inputs) and register initialization at power-up, eliminating boot-time glitches. |
| Polarity inversion register | Enables software-defined active-high/active-low interpretation of input states without external inverters. |
| Noise-filtered SCL/SDA inputs | Rejects sub-50 ns spikes, improving reliability in electrically noisy factory automation environments. |
| Latched output structure | Maintains output state across I²C bus interruptions or host sleep cycles - critical for fail-safe actuator control. |
| 5-V tolerant I/Os | Allows direct connection to 5 V sensors or legacy peripherals while powered from 3.3 V, reducing BOM count. |
Applications
| Industrial HMI Keypad Interface | Smart Energy Meter GPIO Expansion |
|---|---|
|
Use Scenario: A 16-key membrane keypad with debounced inputs connected to P0–P7, scanned by an ARM Cortex-M0+ MCU via I²C. IC Role / Device Role / Timing Role: PCA9534ADW acts as a remote input concentrator, generating INT pulses only on key press/release transitions. Use Value: Reduces MCU GPIO usage from 16 to 2 (SCL/SDA), lowers firmware polling overhead, and cuts PCB routing complexity by 87%. |
Use Scenario: Adding isolated digital inputs (tamper detection, relay status) and outputs (LED indicators, alarm drivers) to a Class 0.5S electricity meter. IC Role / Device Role / Timing Role: PCA9534ADW provides 8-bit parallel I/O with interrupt-driven event reporting to the meter's main SoC over SMBus. Use Value: Enables EN 50470-compliant tamper logging with <4 μs response latency and ≤1 μA standby draw during meter sleep mode. |
| Automotive Body Control Module | Medical Infusion Pump Status Panel |
|
Use Scenario: Monitoring door lock switches, trunk release, and mirror position sensors in a 12 V automotive BCM using 5 V logic rails. IC Role / Device Role / Timing Role: PCA9534ADW serves as a fault-tolerant I/O expander with 5-V-tolerant inputs, interfacing directly to 12 V pull-up sensors. Use Value: Eliminates need for discrete level translators; withstands load-dump transients up to 6 V; supports ASIL-B diagnostic coverage via register readback. |
Use Scenario: Driving six status LEDs and reading four safety interlock switches on an IEC 60601-1 compliant IV pump front panel. IC Role / Device Role / Timing Role: PCA9534ADW functions as a certified-safe I/O hub, with latch retention ensuring LED state persistence during MCU resets. Use Value: Meets IEC 62304 SW safety requirement for deterministic I/O behavior; reduces risk of misindication during power cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I/O expander applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCA6408A | Wider VCC range (1.65–5.5 V), integrated power-on reset ramp tolerance, but no polarity inversion register. | Preferred for ultra-low-voltage battery-powered designs (<2.3 V), less suitable where input polarity reversal is required in firmware. | Select TCA6408A when operating below 2.3 V or requiring unrestricted POR ramp/fall times; retain PCA9534ADW for polarity flexibility and TI-legacy design continuity. |
| PCA9534 | Identical functionality and pinout, but uses 0100xxx I²C address (vs. PCA9534ADW's 0111xxx), allowing 16 devices on one bus. | Enables mixed deployment with PCA9534ADW for higher node density in large-scale I/O systems (e.g., modular PLC racks). | Choose PCA9534 when expanding beyond eight expanders on a single I²C segment; PCA9534ADW remains optimal for standalone or small-cluster deployments. |
Compared with TCA6408A and PCA9534, the PCA9534ADW offers unique polarity inversion capability and tighter 2.3–5.5 V operation - making it ideal for industrial control where input signal inversion is needed without firmware overhead and where 2.3 V minimum rail stability is guaranteed.
Availability
PCA9534ADW is available at Aetrix Electronics and suitable for industrial HMI interfaces, smart energy metering, automotive body control modules, and medical device status panels requiring stable component supply and long-term manufacturability.
Supply support for PCA9534ADW 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of experience in industrial, automotive, and medical-grade IC design.
The PCA9534A family was engineered to deliver reliable, low-power I²C-based GPIO expansion for resource-constrained microcontrollers in harsh electromagnetic environments - particularly targeting programmable logic controllers and energy infrastructure.
FAQ
What is the I²C slave address of the PCA9534ADW?
The PCA9534ADW uses a fixed 7-bit I²C slave address of 0x38–0x3F (binary 0111xxx), determined by the logic levels on A0, A1, and A2 pins. This differs from the PCA9534 (0100xxx), enabling up to 16 identical I/O expanders on one I²C bus when both variants are deployed. The PCA9534ADW address is not software-configurable.
Does the PCA9534ADW support 5-V-tolerant I/Os when powered from 3.3 V?
Yes, the PCA9534ADW supports 5-V-tolerant I/Os across its full 2.3–5.5 V VCC range. When powered from 3.3 V, P0–P7 can safely accept input voltages up to 5.5 V without damage or clamping - enabling direct interface with 5 V sensors, switches, or legacy peripherals without external level-shifting circuitry.
How does the interrupt (INT) output behave on the PCA9534ADW?
The PCA9534ADW features an open-drain, active-low INT output that asserts when any configured input pin's physical state differs from its corresponding bit in the Input Port Register. The interrupt remains asserted until the host reads the Input Port Register or modifies the relevant I/O configuration - ensuring no edge is missed even during extended I²C bus arbitration delays.
Can the PCA9534ADW drive LEDs directly?
Yes, the PCA9534ADW can drive LEDs directly: each P0–P7 output supports up to 25 mA sink current (IOL) with VOL ≤ 0.5 V at 2.3 V VCC. For typical red/green LEDs (2 V forward voltage), a series resistor of ~120 Ω (at 3.3 V) or ~220 Ω (at 5 V) ensures safe operation within absolute maximum ratings and thermal limits.
What is the power-on reset behavior of the PCA9534ADW?
At power-up, the PCA9534ADW performs an internal power-on reset (POR) that initializes all registers to default states: all I/Os as inputs, polarity inversion disabled, and INT deasserted. The POR triggers when VCC rises above VPORR (1.2–1.5 V) and releases once stable; no external reset signal is required, ensuring glitch-free startup in battery-backed systems.
PCA9534ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Number of I/O:
- 8
- 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:
- 16-SOIC
PCA9534ADW FAQ
1.How can I place an order for PCA9534ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9534ADW 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 PCA9534ADW reliable?
The price and inventory of PCA9534ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9534ADW is usually 5 days.
3.What payment methods are accepted for PCA9534ADW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9534ADW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9534ADW?
PCA9534ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9534ADW 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 PCA9534ADW?
For technical support, including PCA9534ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9534ADW requirements.
6.How does Aetrix verify that PCA9534ADW is sourced from the original manufacturer or authorized distributors?
All PCA9534ADW 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 PCA9534ADW meets industry standards.
7.What is the process for return or replacement of PCA9534ADW?
All PCA9534ADW units undergo pre-shipment inspection (PSI). If there is an issue with PCA9534ADW, 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 PCA9534ADW part is unused and in its original packaging.
Return procedure for PCA9534ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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