PCA9554ADW - 8-Bit I2C I/O Expander | Texas Instruments
MPN: PCA9554ADW ✓ सक्रियPCA9554ADW अवलोकन
An I2C I/O expander is a peripheral interface IC that converts a serial I2C or SMBus connection into additional parallel digital inputs and outputs. Its place in the hierarchy is GPIO expander, I/O expander, interface IC, and semiconductor. It reduces microcontroller pin usage while retaining individual control and status reporting for switches, indicators, sensors, and other external circuitry.
The PCA9554ADW supports eight I/O ports, three hardware address inputs, interrupt output, port configuration registers, and weak pull-ups. According to the manufacturer datasheet, the A0, A1, and A2 pins permit up to eight devices to share one I2C bus. The interrupt output is open-drain and active low, allowing connected devices to signal a change in input-port state without continuous microcontroller polling.
Communication is based on the two-wire I2C interface, with SCL and SDA pins and a stated operating frequency up to 400 kHz. The device supports a 2.3 V to 5.5 V supply range, making it suitable for common embedded rails. Its eight quasi-bidirectional I/O ports can be configured individually as inputs or outputs, while the configuration and polarity registers support bus-oriented control requirements.
Typical uses include industrial control modules, sensor-hub boards, LED and switch interfaces, compact data-acquisition equipment, and general-purpose embedded controller platforms. An I2C GPIO expander is especially useful when the host controller has too few pins for external switches, status indicators, isolators, or sensor interfaces. The active-low interrupt path helps conserve processor resources when only occasional input changes occur.
PCB implementation requires careful bus layout. Keep SDA and SCL traces short, provide the pull-up network required by the system, and route the interrupt trace away from high-current switching nodes. Confirm address-strapping levels and port directions during firmware initialization, and account for the SOIC package's 16-pin footprint when planning assembly.
This page combines interface details, application guidance, pin information, comparison context, and design-focused considerations to support faster component selection and PCB planning. Engineers can use the application sections to identify suitable host-controller arrangements, while the design notes highlight bus, addressing, and interrupt considerations that are important beyond the basic component specifications.
के लिए ड्रॉप-इन विकल्प PCA9554ADW — समान पैकेज, पिन-टू-पिन संगत। PCB रीवर्क आवश्यक करने वाले भिन्न-पैकेज पार्ट्स शामिल नहीं हैं।
इस उत्पाद के लिए कोई drop-in alternatives उपलब्ध नहीं।
विकल्प अनुरोध करेंPCA9554ADW विशेषताएं
| Device Type | 8-bit I2C/SMBus GPIO expander |
| Number of I/O Ports | 8 ports |
| Supply Voltage Range | 2.3 V to 5.5 V |
| Maximum I2C Clock Frequency | 400 kHz |
| इंटरफ़ेस | I2C/SMBus |
| Interrupt Output | Open-drain, active-low |
| Weak Pull-Up Feature | 8 ports |
| Configuration Registers | 8 input/output ports with configuration registers |
| Hardware Address Inputs | 3 inputs: A0, A1, and A2 |
| Maximum Devices per Bus | 8 devices |
| Package Type | 16-pin SOIC |
| Package Width | 7.50 mm |
| Packaging | Tube |
| ऑपरेटिंग तापमान | -40 C to +85 C |
| Device Technology | CMOS |
| माउंटिंग प्रकार | Surface mount |
PCA9554ADW पिन कॉन्फ़िगरेशन
| पिन 1 | A0 — Address input A0 |
| पिन 2 | A1 — Address input A1 |
| पिन 3 | A2 — Address input A2 |
| पिन 4 | P0 — I/O port P0 |
| पिन 5 | P1 — I/O port P1 |
| पिन 6 | P2 — I/O port P2 |
| पिन 7 | P3 — I/O port P3 |
| पिन 8 | GND — Ground connection |
| पिन 9 | P4 — I/O port P4 |
| पिन 10 | P5 — I/O port P5 |
| पिन 11 | P6 — I/O port P6 |
| पिन 12 | P7 — I/O port P7 |
| पिन 13 | SCL — Serial clock input |
| पिन 14 | SDA — Serial data input and output |
| पिन 15 | INT — Open-drain active-low interrupt output |
| पिन 16 | VCC — Power supply connection |
सामान्य अनुप्रयोग
PCA9554ADW के लिए उपयुक्त है 6 अनुप्रयोगs: Industrial Control Module, Sensor and Alarm Interface, LED and Switch User Interface, Data Acquisition Front End, Automotive Accessory Controller, Communications Module.
Industrial Control Module
The PCA9554ADW fits industrial control modules that need more discrete inputs and outputs than the host controller provides directly. Its eight ports operate from a 2.3 V to 5.5 V supply, allowing the expander to share the logic rail used by many embedded controllers. A host such as the STM32G0B1RET6 can read and update each port through I2C while the active-low interrupt reports input changes. Configure unused pins as inputs with weak pull-ups, subject to the external resistor values required by the application.
अनुशंसित
Sensor and Alarm Interface
The PCA9554ADW is useful in sensor-hub and alarm-interface boards where several switches, fault signals, or digital sensor outputs must reach one I2C bus. The three address inputs allow up to eight expander devices to share a bus, while the open-drain active-low interrupt lets the host sleep between state changes. Its 400 kHz interface supports efficient multi-device communication. Use the eight configurable ports for logic-level signals and verify external pull-up requirements whenever the connected line is not actively driven.
अनुशंसित
LED and Switch User Interface
A PCA9554ADW can consolidate push-button inputs, status LEDs, mode selectors, and other user-interface signals on a compact embedded board. Individual port-direction configuration lets a mixture of input and output functions share the same device, and the interrupt line can alert the controller when a button or switch changes state. The 16-pin SOIC package simplifies routing in dense assemblies. Account for LED current, external drive transistors where necessary, and switch bounce when defining firmware behavior.
अनुशंसित
Data Acquisition Front End
The PCA9554ADW can add digital control and status channels to a data-acquisition front end alongside analog measurement circuitry. Inputs may represent range selection, instrument enable, overload, or ready signals, while outputs can control compatible digital stages. Operating from 2.3 V to 5.5 V permits use with multiple embedded logic rails, and the 400 kHz bus rate supports rapid register access. Keep sensitive measurement paths physically separated from the interrupt and switching traces to avoid coupling noise into the acquisition system.
अनुशंसित
Automotive Accessory Controller
The PCA9554ADW can support low-voltage accessory and body-control interfaces when the system requirements match its 2.3 V to 5.5 V range and -40 C to +85 C operating range. It provides eight configurable lines for switches, latches, and status indicators, while the interrupt output reduces host-polling overhead. An automotive design should verify qualification, transient protection, load-current capability, and application-specific requirements rather than assuming that general-purpose status ranges alone establish suitability.
अनुशंसित
Communications Module
The PCA9554ADW fits communications and network-interface modules requiring local control of connector, reset, routing, or fault signals. The I2C host can access the expander without consuming eight dedicated GPIO pins, and the interrupt output can indicate an external hardware event. Because the PCA9554ADW supports up to 400 kHz, it can coexist efficiently with other addressed I2C peripherals. Address assignment must be unique across the bus, and signal-integrity practices should preserve controlled rise times on SDA and SCL.
अनुशंसित
अनुशंसित उत्पादों का सारांश
के लिए इंजीनियरिंग संदर्भ डेटा PCA9554ADW — तुलना, डिज़ाइन मार्गदर्शन और अनुपालन जानकारी।
चयन गाइड
विकल्पों के साथ तुलना
| पैरामीटर | यह उत्पाद |
|---|---|
| Package | 16-pin SOIC |
| Brand | Texas Instruments |
| Device Type | 8-bit I2C/SMBus GPIO expander |
| Number of I/O Ports | 8 ports |
| Supply Voltage Range | 2.3 V to 5.5 V |
| Maximum Bus Frequency | 400 kHz |
| Interrupt Output | Open-drain, active-low |
| Address Inputs | 3 hardware address inputs |
| Packaging | Tube |
मुख्य विशेषताएँ
- Higher supported I2C operating frequency (बनामPCF8574AT)
- Dedicated configuration-register control (बनामPCF8574AT)
- Flexible multi-device bus addressing (बनामPCF8574AT)
डिज़ाइन नोट्स
Route SDA and SCL as short, geometry-matched traces and place the required pull-up resistors close to the bus master. Avoid splitting the buses behind long stubs or test pads. The manufacturer supports operation up to 400 kHz, but the usable rate also depends on capacitance, pull-up resistance, voltage level, and every device attached to the shared bus.
Do not assume that the PCA9554A can replace a PCF8574 without firmware review. Although the devices are described as pin-to-pin and I2C-address compatible, the PCA9554A adds configuration-register behavior that requires software changes. Update register initialization, port-direction handling, polarity logic, and interrupt servicing, then verify the revised device on hardware.
Check every connected port's voltage domain before enabling it as an output. The PCA9554ADW operates from 2.3 V to 5.5 V, but its ports may not tolerate signals outside the selected external pull-up or bus voltage domain. Use suitable level translation for mixed-voltage systems, and configure unused inputs with an intentional pull-up arrangement rather than allowing them to float.
Assign A0, A1, and A2 carefully so every PCA9554A on one bus has a unique address. The three address inputs support up to eight devices, but duplicated strap settings cause address collisions and unreliable communication. Document the logical address in firmware, avoid boot-time bus scanning assumptions, and test the final pull-up and address configuration on production hardware.
अनुपालन जानकारी
Compliance status requires confirmation from the manufacturer product page or current material declaration for the exact ordering suffix.