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NXP Semiconductors PCA9554BBSHP
- Part No.:
- PCA9554BBSHP
- Manufacturer:
- NXP Semiconductors
- Category:
- I/O Expanders
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
PCA9554BBSHP.pdf
- Description:
- IC XPND 400KHZ I2C SMBUS 16HVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,751
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Product details
Overview
PCA9554BBSHP from NXP Semiconductors is an 8-bit I²C-bus/SMBus GPIO expander with interrupt output, weak internal pull-up resistors (100 kΩ), and 1.65 V to 5.5 V supply operation. It provides configurable input/output ports (P0–P7), polarity inversion, and power-on reset - used in ACPI power switches, LED fan control, push-button interfaces, and sensor subsystems where minimal interconnect and low standby current (1.5 µA at 5 V) are critical.
For engineers reviewing the PCA9554BBSHP datasheet, PCA9554BBSHP pinout, PCA9554BBSHP application, or PCA9554BBSHP equivalent, key selection criteria include its HVQFN16 package, fixed I²C address (0x20–0x27 via A0–A2), open-drain INT output, 25 mA sink capability per port, and compatibility with 3.3 V/5 V microcontrollers without level shifters.
Technical Context
The PCA9554BBSHP implements a register-mapped I²C slave interface with four dedicated 8-bit registers: Input Port (00h, read-only), Output Port (01h), Polarity Inversion (02h), and Configuration (03h). All I/Os default to high-impedance inputs with internal 100 kΩ pull-ups at power-on reset.
Its interrupt logic triggers on any input state change versus the Input Port register value, asserting active-low open-drain INT. The device supports Fast-mode I²C (400 kHz), features Schmitt-trigger inputs on SCL/SDA (Vhys = 0.10 × VDD), and tolerates 5 V on I/O pins regardless of VDD level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C Address | Fixed 7-bit address 0x20–0x27 (hardware-selectable via A0/A1/A2); PCA9554B variant uses 0x20 base |
| Supply Voltage | 1.65 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without external level translation |
| Standby Current | 1.5 µA typical at 5 V VDD - supports battery-powered systems requiring ultra-low quiescent power |
| Output Sink Current | 25 mA per port (P0–P7) - sufficient to directly drive LEDs or small loads without external drivers |
| Interrupt Output | Open-drain, active-low INT - requires external pull-up; asserts when any input differs from Input Port register state |
| Input Protection | 5 V tolerant I/Os and ±20 mA clamping current - allows safe operation in mixed-voltage systems |
| ESD Rating | 2000 V HBM, 1000 V CDM - meets industrial-grade robustness requirements for board-level reliability |
Pinout & Package
HVQFN16 package (3 mm × 3 mm × 0.85 mm, SOT758-1), thermally enhanced with exposed center pad requiring PCB thermal vias and solder connection to VSS for optimal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware address bit 0 | Selects LSB of 7-bit I²C slave address (0x20–0x27); tied HIGH/LOW to configure unique bus position |
| A1 | Hardware address bit 1 | Second address bit; enables up to eight PCA9554B devices on same I²C bus without conflict |
| A2 | Hardware address bit 2 | MSB of hardware address; combined with A0/A1 defines full 3-bit address offset |
| P0–P7 | Configurable I/O port pins | Bi-directional ports default to inputs with 100 kΩ internal pull-ups; support 25 mA sink when configured as outputs |
| INT | Interrupt output | Open-drain, active-low signal indicating input state change; must be pulled up externally to host controller's VIO |
| SCL/SDA | I²C serial clock/data | Compliant with Fast-mode (400 kHz); Schmitt-trigger inputs improve noise immunity on slow or noisy buses |
| VDD/VSS | Power supply and ground | VSS connects to both pin 6 and exposed thermal pad; pad must be soldered to PCB ground plane for thermal/electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| Internal 100 kΩ pull-ups | Eliminates need for 8 external resistors on input-configured ports - reduces BOM count and PCB area |
| Power-on reset | Guarantees all registers (Configuration, Output, Polarity) initialize to known defaults - prevents undefined I/O states at startup |
| Latched outputs | Output Port register retains state across I²C transactions - enables reliable LED or switch control without constant polling |
| Input polarity inversion | Per-pin inversion (via register 02h) allows software normalization of active-high/active-low sensors without hardware changes |
| 5 V tolerant I/Os | Operates with VDD as low as 1.65 V while accepting 0–5.5 V input signals - simplifies integration with legacy 5 V peripherals |
Applications
| ACPI Power Switch Interface | LED Fan Speed Indicator |
|---|---|
|
Use Scenario: Monitoring mechanical power buttons and latching power-state transitions in laptop/desktop systems. IC Role / Device Role / Timing Role: GPIO expander providing debounced, interrupt-driven input capture for ACPI GPE events. Use Value: Reduces host CPU polling overhead via INT assertion; internal pull-ups eliminate external components; 1.65–5.5 V range matches system rail diversity. |
Use Scenario: Driving multi-color status LEDs indicating fan RPM zones (low/medium/high/fault) in embedded thermal management. IC Role / Device Role / Timing Role: Output driver with 25 mA sink per channel controlling common-anode LED segments. Use Value: Direct LED drive avoids discrete transistors; polarity inversion register enables consistent active-low logic across varied LED forward voltages. |
| Industrial Sensor Subsystem | Push-Button Keypad Interface |
|
Use Scenario: Aggregating digital outputs from temperature, humidity, and motion sensors in edge gateway equipment. IC Role / Device Role / Timing Role: Parallel-to-I²C bridge collecting asynchronous sensor alerts with synchronized INT signaling. Use Value: Single I²C address space manages up to 8 sensors; Schmitt-trigger inputs reject EMI in noisy factory environments. |
Use Scenario: Scanning matrix keypads or discrete momentary switches in HMI panels and control consoles. IC Role / Device Role / Timing Role: Configurable input port with interrupt-on-change for responsive, low-latency key detection. Use Value: Eliminates MCU GPIO scarcity; INT line wakes host from sleep mode only on actual keypress - extends battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar GPIO expander applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9554BPWJ | TSSOP16 package (4.4 mm width); identical electrical specs and register map; no thermal pad | Better suited for manual assembly or prototyping; lower thermal performance than HVQFN16 in high-power-density layouts | Select PCA9554BPWJ when board space permits larger footprint and thermal vias are impractical |
| PCAL9554BBSHP | Agile I/O variant with programmable slew rate, glitch filtering, and interrupt masking per pin | Required for systems needing per-port debounce, edge-selectable interrupts, or EMI-hardened I/O in automotive/industrial settings | Choose PCAL9554BBSHP when advanced I/O conditioning or selective interrupt control is mandatory |
Compared with PCA9554BPWJ and PCAL9554BBSHP, the PCA9554BBSHP delivers optimal cost-performance balance for standard I²C GPIO expansion - offering HVQFN16 thermal efficiency and full register compatibility without premium Agile I/O features.
Availability
PCA9554BBSHP is available at Aetrix Electronics and suitable for industrial sensor subsystems, ACPI-compliant power management, and LED-based status indication requiring stable component supply across extended temperature ranges (−40 °C to +85 °C).
Supply support for PCA9554BBSHP 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 leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in I²C ecosystem components.
The PCA9554BBSHP belongs to NXP's low-power I²C GPIO expander product line, designed to extend microcontroller I/O count while minimizing board space, BOM cost, and firmware complexity in resource-constrained embedded systems.
FAQ
What is the I²C slave address range supported by the PCA9554BBSHP?
The PCA9554BBSHP uses a fixed 7-bit base address of 0x20. Hardware address pins A0, A1, and A2 allow selection of eight unique addresses from 0x20 to 0x27. This enables multiple PCA9554BBSHP devices on a single I²C bus without address collision - critical in dense I/O expansion scenarios.
Does the PCA9554BBSHP require external pull-up resistors on its I²C lines?
Yes, the PCA9554BBSHP requires external pull-up resistors on SCL and SDA lines - the internal 100 kΩ pull-ups apply only to the P0–P7 I/O ports when configured as inputs. I²C bus compliance mandates external pull-ups (typically 2.2 kΩ to 10 kΩ) to meet rise-time specifications for 400 kHz Fast-mode operation.
How does the interrupt (INT) output of the PCA9554BBSHP behave during I²C read transactions?
The PCA9554BBSHP INT output is cleared automatically upon reading the Input Port register (address 0x00) that triggered the interrupt. The reset occurs at the ACK/NACK bit after the rising edge of SCL - meaning the interrupt remains asserted until the host completes the read transaction and acknowledges the data byte.
Can the PCA9554BBSHP drive LEDs directly, and what are the current limitations?
Yes, the PCA9554BBSHP can drive LEDs directly in sink configuration: each P0–P7 port supports up to 25 mA continuous sink current at VOL ≤ 0.7 V. For reliable operation, ensure total device IDD stays within 160 mA limit and derate based on ambient temperature and PCB thermal design.
What happens to the I/O configuration of the PCA9554BBSHP after power-on reset?
On power-on reset, the PCA9554BBSHP initializes all eight I/O pins (P0–P7) as high-impedance inputs with internal 100 kΩ pull-up resistors enabled. The Configuration register (0x03) defaults to 0xFF, Output Port register (0x01) to 0xFF, and Polarity Inversion register (0x02) to 0x00 - ensuring predictable, glitch-free startup behavior.
PCA9554BBSHP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- 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:
- 1.65V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HVQFN (3x3)
PCA9554BBSHP FAQ
1.How can I place an order for PCA9554BBSHP through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9554BBSHP 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 PCA9554BBSHP reliable?
The price and inventory of PCA9554BBSHP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9554BBSHP is usually 5 days.
3.What payment methods are accepted for PCA9554BBSHP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9554BBSHP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9554BBSHP?
PCA9554BBSHP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9554BBSHP 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 PCA9554BBSHP?
For technical support, including PCA9554BBSHP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9554BBSHP requirements.
6.How does Aetrix verify that PCA9554BBSHP is sourced from the original manufacturer or authorized distributors?
All PCA9554BBSHP 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 PCA9554BBSHP meets industry standards.
7.What is the process for return or replacement of PCA9554BBSHP?
All PCA9554BBSHP units undergo pre-shipment inspection (PSI). If there is an issue with PCA9554BBSHP, 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 PCA9554BBSHP part is unused and in its original packaging.
Return procedure for PCA9554BBSHP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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