PCA9554DBR - 8-Bit I2C I/O Expander, 5.5V | TI (Tape & Reel)
MPN: PCA9554DBR ✓ Hoạt độngPCA9554DBR Tóm tắt
An I/O expander is an interface IC that increases the number of input and output lines available to a microcontroller or other host processor. The PCA9554 belongs to the I2C interface-controller hierarchy: it connects through the two-line bidirectional bus using SCL and SDA, while its eight parallel pins can be configured individually as inputs or outputs. This makes it useful when a system needs remote control, monitoring, or signal-interface expansion without adding a larger microcontroller package.
The verified listing identifies weak pull-ups, an interrupt output, and configuration registers as defining features. Configuration registers allow the host to define each port direction and control output states, while the interrupt output provides a change notification mechanism for input events. The 2.3 V to 5.5 V operating range supports both low-voltage and conventional 5 V system rails, subject to the host and bus requirements.
The PCA9554DBR is identified as a 16-SSOP I/O expander by DigiKey, with an operating bus frequency of 400 kHz. This combination of eight configurable I/O lines, interrupt support, and a compact surface-mount package makes the device suitable for embedded control, remote sensing, keypad or display interfaces, and small automation systems.
Designers should confirm the device address, pull-up implementation, electrical limits, and interrupt polarity against the manufacturer datasheet before finalizing a board. The verified data does not provide pin-level naming, output-current limits, or detailed timing values, so those parameters require verification rather than assumption.
Bộ thay thế dễ dàng lắp đặt cho PCA9554DBR — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PCA9554DBR (cùng hình factor và footprint) — khác nhau ở Interrupt Output, Package, Configuration Registers, Operating Temperature.
PCA9554ABS3,118
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →TCA9554PWR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TCA9554ADBR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PCA9534DB
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PCA9554DBR Thông số kỹ thuật
| Chức năng | 8-bit I2C/SMBus I/O expander with interrupt |
| Number of I/O Lines | 8 |
| Operating Voltage Range | 2.3 V to 5.5 V |
| Giao diện | I2C/SMBus |
| Maximum Bus Frequency | 400 kHz |
| Configuration Registers | Present |
| Interrupt Output | Present |
| Weak Pull-Ups | Present |
| Hộp | 16-pin SSOP |
| Kiểu lắp đặt | Surface mount |
| Device Class | General-purpose remote I/O expander |
| Cấu hình đầu ra | Individually configurable input/output ports |
| Bus Signals | SCL and SDA |
Hướng dẫn cấu hình chân PCA9554DBR 16-pin ssop
Cấu hình chân cho PCA9554DBR (16-pin ssop gói). Số thứ tự chân, chức năng và sơ đồ kết nối được xác định trong tài liệu thông số kỹ thuật của nhà sản xuất. Tham khảo nó để biết footprint và hướng dẫn hàn chính xác.
Không có dữ liệu chân cụ thể sẵn có cho PCA9554DBR.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
PCA9554DBR phù hợp cho 7 Áp dụngs: Microcontroller GPIO Expansion, Remote Sensor and Actuator Interface, Embedded Control Panel, Industrial Automation Module, Remote Monitoring and Control, LED and Indicator Control, Consumer and Communication Equipment.
Microcontroller GPIO Expansion
The PCA9554DBR is useful when a microcontroller has too few direct pins for control and monitoring functions. Its eight configurable I/O ports operate through the I2C/SMBus interface at up to 400 kHz, allowing the host to read remote inputs and drive remote outputs while conserving package pins. The design should define port directions in the configuration registers and account for the device's interrupt output when an input change must wake the host.
Được đề xuất
Remote Sensor and Actuator Interface
PCA9554DBR can place eight digital I/O lines behind an I2C connection between a controller and a remote circuit card. This arrangement is useful for reading discrete sensor outputs or driving relays, indicators, and other digital actuators when direct board-to-board GPIO routing is inconvenient. The 2.3 V to 5.5 V operating range supports mixed-voltage systems, but cable length, bus capacitance, pull-up values, grounding, and output drive must be validated for the selected remote load.
Được đề xuất
Embedded Control Panel
The eight ports can serve as an I2C-connected front panel interface for buttons, indicators, lamps, selectors, and status signals. A host microcontroller can scan inputs and update outputs over the same two-wire bus, reducing wiring compared with direct GPIO. The verified interrupt feature can reduce unnecessary polling when an input state changes, while the 400 kHz maximum bus rate supports compact embedded-control architectures when the total bus loading and firmware timing remain acceptable.
Được đề xuất
Industrial Automation Module
PCA9554DBR is suitable for small automation modules that need a compact, addressable set of digital outputs and inputs. The device can connect discrete control signals to a microcontroller while the interrupt output provides an event path for changing input conditions. In an industrial enclosure, engineers should verify voltage tolerances, isolation requirements, surge protection, grounding, connector current limits, and the operating temperature range because those details are not provided in the supplied verified snippets.
Được đề xuất
Remote Monitoring and Control
The PCA9554DBR can monitor remote digital conditions and return control outputs through the host's I2C bus. This pattern is useful in equipment where a central controller needs distributed status points without routing every signal back as a direct GPIO. The interrupt output can signal activity, but system timing depends on the host firmware, bus clock, pull-up network, and whether the remote signals are slower than the 400 kHz bus capability. Input thresholds and output current must be confirmed from the full datasheet.
Được đề xuất
LED and Indicator Control
Eight output ports from PCA9554DBR can control groups of LEDs, status lamps, or indicator signals when the host lacks sufficient direct output pins. The I2C connection reduces the number of dedicated microcontroller pins, while configuration registers define which ports are outputs. The designer must check the device's output drive limits and supply requirements before directly loading LEDs or other devices; the supplied data confirms eight I/O lines and configurable ports but does not specify per-pin output current.
Được đề xuất
Consumer and Communication Equipment
PCA9554DBR can add configurable digital lines in compact consumer, communications, or accessory hardware where the main controller is connected to I2C. Its 2.3 V to 5.5 V range accommodates common low-voltage and 5 V rails, and the 16-pin SSOP package supports compact board layouts. Product-specific compliance, temperature, EMC, and output-loading requirements are not supplied in the verified data and must be evaluated separately rather than inferred from the interface function.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PCA9554DBR — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PCA9554A | TCA9554PWR | TCA9554ADBR | PCA9534DB |
|---|---|---|---|---|---|
| Brand | Texas Instruments | NXP Semiconductors | Texas Instruments | Texas Instruments | NXP Semiconductors |
| Package | 16-pin SSOP | 16-pin SSOP | TSSOP-16 | SSOP-16 | 16-pin SSOP |
| Interface | I2C/SMBus | I2C/SMBus | I2C/SMBus | I2C/SMBus | I2C/SMBus |
Bảo phân biệt quan trọng
- Eight configurable remote I/O lines in a compact 16-pin SSOP package (vsPCA9554A)
- Explicit interrupt, configuration-register, and weak-pull-up features (vsPCA9534DB)
- I2C/SMBus operation up to 400 kHz (vsTCA9554PWR)
Ghi chú thiết kế
Place the PCA9554DBR close to the SCL and SDA routing and keep the I2C traces short and continuous. The verified device supports up to 400 kHz, but actual bus operation also depends on capacitance, pull-up resistance, trace length, and every peripheral on the bus. Confirm the complete pin names and exposed connections from the manufacturer datasheet before finalizing the footprint.
Design the 2.3 V to 5.5 V supply rail with appropriate local decoupling and verify the host and peripheral logic levels. Do not infer output-current capability from the eight-port description; the verified snippets do not provide per-pin drive limits, so loads such as LEDs or relay drivers must be checked against the full manufacturer datasheet.
Do not treat PCA9554 and PCA9554A as address-identical. The supplied NXP listing states that the devices have different addresses, so replacing one with the other can leave the host controller unable to communicate. Firmware, pull-up configuration, interrupt polarity, and the selected manufacturer must all be reviewed together.
Reserve test points for VCC, ground, SCL, SDA, the interrupt line, and all eight I/O signals. Keeping these points accessible helps validate bus rise time, port direction, and interrupt behavior during bring-up. If a remote cable or long trace is used, evaluate signal integrity and protection separately from the nominal 400 kHz specification.
Thông tin tuân thủ
The supplied verified snippets do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. No compliance claim should be inferred from the interface description.