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Texas Instruments PCA9534ADGVR
- Part No.:
- PCA9534ADGVR
- Manufacturer:
- Texas Instruments
- Category:
- I/O Expanders
- Package:
- 16-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
PCA9534ADGVR.pdf
- Description:
- IC XPND 400KHZ I2C SMBUS 16TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,039
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Product details
Overview
PCA9534ADGVR 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 up to 400-kHz bus speed and featuring 5-V-tolerant I/Os, 1 μA max standby current, and hardware address pins (A0–A2) for eight-device addressing. It serves as a slave-side parallel port extension in microcontroller-based systems requiring low-power GPIO expansion.
For engineers reviewing the PCA9534ADGVR datasheet, PCA9534ADGVR pinout, PCA9534ADGVR application, or PCA9534ADGVR equivalent, this page delivers verified functional identity, confirmed package mapping (SSOP-16), validated I²C timing compliance, interrupt behavior under input state change, and real-world design implications of its polarity inversion register and open-drain INT output.
Technical Context
The PCA9534ADGVR implements a synchronous I²C slave interface with internal configuration, input, output, and polarity inversion registers - all accessible via standard read/write transactions. Its power-on reset circuit initializes all I/Os as inputs and clears registers to default states without glitch.
Interrupt generation is edge-triggered on input state mismatch against the input port register, latched until cleared by host read; the open-drain INT output requires external pull-up. Noise filtering on SCL/SDA and ESD protection per JESD22 exceed 2000-V HBM ensure robust operation in noisy industrial environments.
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 logic domains without level shifters. |
| Max I²C Speed | 400 kHz Fast Mode - enables high-throughput GPIO control in time-critical embedded systems. |
| Standby Current | 1 μA max at 5.5 V - enables battery-powered applications with multi-year sleep duration. |
| I/O Count | 8 bidirectional ports (P0–P7) - provides scalable digital I/O without MCU pin exhaustion. |
| Interrupt Output | Open-drain active-low INT - signals input changes asynchronously to host MCU, reducing polling overhead. |
| Address Pins | A0, A1, A2 - allow eight unique I²C addresses (0x20–0x27) on shared bus, enabling dense I/O node deployment. |
| 5-V Tolerance | P0–P7 pins tolerate up to 5.5 V - permits safe connection to 5-V peripherals even when VCC = 2.3 V. |
Pinout & Package
PCA9534ADGVR is supplied in SSOP-16 (DB) package, 6.20 mm × 5.30 mm body size, with gull-wing leads compatible with standard surface-mount reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware address bit 0 | Connects to GND or VCC to set LSB of 7-bit I²C slave address (0x20–0x27). |
| A1 | Hardware address bit 1 | Second address bit; combined with A0/A2 determines unique device address on I²C bus. |
| A2 | Hardware address bit 2 | MSB of hardware address; enables up to eight PCA9534ADGVR devices on same I²C segment. |
| P0–P7 | Bidirectional I/O port pins | Configurable as input or output via configuration register; push-pull structure supports LED drive up to 25 mA per pin. |
| GND | Ground reference | Return path for all internal circuits and I/O current; must be low-impedance connection. |
| VCC | Power supply | Supplies core logic and I/O drivers; decoupling capacitor (0.1 μF) required near pin. |
| SDA | I²C serial data line | Open-drain bidirectional bus line; requires external pull-up resistor (typically 2.2–10 kΩ). |
| SCL | I²C serial clock line | Open-drain clock input; synchronized with SDA transitions; also requires external pull-up. |
| INT | Interrupt output | Active-low open-drain signal asserted when any Pn input state differs from register value; requires pull-up to host interrupt rail. |
Key Features
| Feature | Design Value |
|---|---|
| Input/output configuration register | Per-pin direction control allows dynamic reassignment of P0–P7 as inputs or outputs during runtime. |
| Polarity inversion register | Enables logical inversion of input port values before reading - simplifies firmware handling of active-low sensors/switches. |
| Noise-filtered SCL/SDA inputs | Internal filtering rejects <100 ns glitches, preventing spurious I²C bus errors in electrically noisy environments. |
| Latched outputs with 25-mA sink capability | Each P-port pin can directly drive LEDs or small relays without external buffers, reducing BOM count. |
| Power-on reset with no glitch | Ensures deterministic I/O state (all inputs) at startup, eliminating race conditions in safety-critical initialization sequences. |
Applications
| Industrial Control Panel | Smart Home Hub Interface |
|---|---|
Use Scenario: Remote monitoring of 8 mechanical pushbuttons and status LEDs on a DIN-rail mounted PLC front panel. IC Role / Device Role / Timing Role: I/O expander providing isolated, low-power GPIO extension over I²C, with INT signaling button presses to main controller. Use Value: Reduces main MCU's GPIO load and eliminates need for dedicated interrupt lines; 1 μA standby extends panel battery life during idle periods. |
Use Scenario: Adding physical toggle switches and indicator LEDs to a Wi-Fi-connected smart home hub with limited native GPIO. IC Role / Device Role / Timing Role: Slave-side I²C peripheral managing local user interface elements while maintaining compatibility with existing firmware I²C stack. Use Value: Enables rapid hardware customization without PCB redesign; 5-V-tolerant I/Os interface directly with legacy 5-V switch/LED components. |
| Automotive Body Controller | Medical Device Keypad Module |
Use Scenario: Monitoring door lock status, mirror position switches, and cabin light controls in a 12-V automotive body control module. IC Role / Device Role / Timing Role: Remote I/O node translating mechanical switch states into I²C-accessible digital inputs, with interrupt-driven wake-up capability. Use Value: Low 1 μA standby current minimizes parasitic drain on vehicle battery; ESD ratings (2000-V HBM) meet automotive qualification requirements. |
Use Scenario: Scanning a 3×3 tactile keypad and driving 9 status LEDs on a portable diagnostic instrument with strict EMC and safety constraints. IC Role / Device Role / Timing Role: Dedicated I/O expansion IC isolating sensitive analog sections from digital switching noise via I²C isolation. Use Value: Internal noise filtering on SCL/SDA prevents false I²C interrupts during RF exposure; latch-up immunity (>100 mA) ensures fault tolerance in clinical environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I/O expander applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TCA6408ARGTR | Wider VCC range (1.65–5.5 V); includes reset input and enhanced power-on reset ramp tolerance. | Preferred for ultra-low-voltage systems (<2.3 V) or designs requiring hardware reset assertion. | Select TCA6408ARGTR if operating below 2.3 V or needing guaranteed reset timing across voltage ramps. |
| PCA9534APW | Identical functionality and register map; differs only in TSSOP-16 (PW) package vs SSOP-16 (DGVR). | Same electrical behavior; choice driven solely by board layout and thermal requirements. | Choose PCA9534APW for higher thermal resistance tolerance (122°C/W vs 82°C/W) or preferred footprint compatibility. |
Compared with TCA6408ARGTR and PCA9534APW, the PCA9534ADGVR offers optimal balance of low standby current (1 μA), proven industrial reliability, and SSOP-16 packaging suited for space-constrained layouts - making it ideal for cost-sensitive, battery-aware, and thermally constrained I²C GPIO expansion.
Availability
PCA9534ADGVR is available at Aetrix Electronics and suitable for industrial control panels, smart home hubs, and automotive body controllers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for PCA9534ADGVR 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, embedded processing, and connectivity technologies, with decades of experience in industrial-grade interface ICs.
The PCA9534A product line delivers low-power, interrupt-capable I/O expansion for resource-constrained microcontrollers - designed specifically for industrial automation, building control, and automotive subsystems where reliability and bus efficiency are critical.
FAQ
What is the I²C address range supported by PCA9534ADGVR?
The PCA9534ADGVR uses three hardware address pins (A0, A1, A2) to configure its 7-bit I²C slave address, supporting eight fixed addresses from 0x20 to 0x27. This allows up to eight PCA9534ADGVR devices on the same I²C bus without address conflict, provided each has a unique A0–A2 combination tied to VCC or GND.
Does PCA9534ADGVR support 5-V logic levels on its I/O pins when powered from 3.3 V?
Yes, PCA9534ADGVR features 5-V-tolerant I/O ports (P0–P7), meaning they accept input voltages up to 5.5 V regardless of VCC level - including when VCC = 3.3 V or 2.3 V. This eliminates level-shifting circuitry when interfacing with legacy 5-V sensors, switches, or LEDs.
How does the interrupt (INT) output of PCA9534ADGVR behave during power-up?
The PCA9534ADGVR's INT output remains deasserted (high) during power-up due to its internal power-on reset, which initializes all I/Os as inputs and clears registers. INT only asserts after VCC exceeds VPOR (~1.5 V) and a subsequent input state change occurs - ensuring no spurious interrupts at startup.
Can PCA9534ADGVR drive LEDs directly, and what are the current limits?
Yes, PCA9534ADGVR's P0–P7 outputs support direct LED driving with 25 mA sink current per pin (VOL ≤ 0.5 V at 3 V). The total port current must not exceed 200 mA, and the sum of sourced currents must remain ≤85 mA. Its latched outputs maintain state without continuous MCU polling.
Is PCA9534ADGVR pin-compatible with PCF8574A, and what software changes are needed?
PCA9534ADGVR is pin-to-pin and I²C address compatible with PCF8574A, but software must accommodate additional registers: configuration, polarity inversion, and input port. Unlike PCF8574A, PCA9534ADGVR requires explicit direction setup before use - no default quasi-bidirectional mode.
PCA9534ADGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-TVSOP
PCA9534ADGVR FAQ
1.How can I place an order for PCA9534ADGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9534ADGVR 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 PCA9534ADGVR reliable?
The price and inventory of PCA9534ADGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9534ADGVR is usually 5 days.
3.What payment methods are accepted for PCA9534ADGVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9534ADGVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9534ADGVR?
PCA9534ADGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9534ADGVR 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 PCA9534ADGVR?
For technical support, including PCA9534ADGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9534ADGVR requirements.
6.How does Aetrix verify that PCA9534ADGVR is sourced from the original manufacturer or authorized distributors?
All PCA9534ADGVR 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 PCA9534ADGVR meets industry standards.
7.What is the process for return or replacement of PCA9534ADGVR?
All PCA9534ADGVR units undergo pre-shipment inspection (PSI). If there is an issue with PCA9534ADGVR, 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 PCA9534ADGVR part is unused and in its original packaging.
Return procedure for PCA9534ADGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9534ADGVR Tags
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