TCA9554DBR - 8-Bit I/O Expander, 1.65-5.5V, SSOP-16 | Texas Instruments
MPN: TCA9554DBR ✓ Hoạt độngTCA9554DBR Tóm tắt
An I/O expander is a semiconductor interface device that adds parallel digital input and output capability to a host controller without requiring additional direct GPIO pins. The TCA9554 sits within the I2C interface hierarchy: host controller, I2C/SMBus bus, I/O expander, and individual digital input/output channels. This makes it useful for reducing connector count, extending control capability, and centralizing control of peripherals such as LEDs, buttons, relays, and sensors.
The principal features include 8 configurable I/O pins, interrupt generation when an input state changes, weak pull-up capability, configuration registers, and support for up to eight devices on the same bus using the three hardware address inputs. According to the Texas Instruments product description, the TCA9554 is intended for low-voltage, low-power peripheral expansion and can be reset to its default state through power-on reset.
The TCA9554DBR uses a serial register-oriented control interface. The host writes to configuration registers to select input or output operation and reads the input port register to determine the state of external logic. The interrupt output provides a way for the host to respond to input changes without continuously polling the I2C bus. Its 1.65 V to 5.5 V operating range supports both low-voltage digital systems and conventional 5 V peripheral environments, while the 400 kHz bus capability improves update rate for larger control tasks.
Typical uses include industrial control panels, consumer appliances, battery-powered equipment, LED status boards, keyboard and button interfaces, sensor aggregation, and compact embedded systems where the primary microcontroller has insufficient GPIO pins. Because the I/O ports operate from the device supply voltage, logic levels must remain compatible with the connected host and external circuits.
PCB layout should keep the I2C bus traces short, provide the pull-up arrangement required by the system, and route the interrupt signal away from high-current switching paths. The SSOP-16 package requires careful soldering and adequate clearance around adjacent components. Designers should also confirm the operating voltage, address configuration, pull-up strength, and interrupt polarity against the application requirements before releasing the PCB.
This product page combines manufacturer specifications, package information, application guidance, comparison context, and practical design notes to support component selection and implementation of the TCA9554DBR.
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TCA9554ADBR
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TCA9554DBR Thông số kỹ thuật
| Product Type | 8-bit I2C/SMBus I/O expander |
| Number of I/O Ports | 8 |
| Supply Voltage Range | 1.65 V to 5.5 V |
| Maximum I2C Clock Frequency | 400 kHz |
| Standard-Mode I2C Clock Frequency | 100 kHz |
| Hộp | 16-pin SSOP (DB), 150 mil |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C |
| Number of Address Inputs | 3, A0/A1/A2 |
| Maximum Devices per I2C Bus | 8 devices |
| Interrupt Output | Yes |
| Configuration Registers | Yes |
| Weak Pull-Up Capability | Yes |
| Power-On Reset | Yes, resets device to default state |
| Kiểu lắp đặt | Surface mount |
| Trạng thái RoHS | RoHS compliant |
| Giao diện | I2C/SMBus |
Hướng dẫn cấu hình chân TCA9554DBR 16-pin ssop (db), 150 mil
Cấu hình chân cho TCA9554DBR (16-pin ssop (db), 150 mil 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 TCA9554DBR.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
TCA9554DBR phù hợp cho 6 Áp dụngs: Industrial Control Panel I/O Expansion, LED Status and Indicator Control, Button and Keyboard Interface, Embedded Sensor and Peripheral Aggregation, Appliance and Consumer Equipment Control, Communication and Network Equipment Interfaces.
Industrial Control Panel I/O Expansion
The TCA9554DBR is useful in industrial control panels where a system controller needs additional digital status inputs and output controls without expanding the host GPIO count. Its 8 configurable I/O ports can monitor pushbuttons, selectors, and interlocks while driving indicator LEDs, relay-control stages, or digital enable signals. The 1.65 V to 5.5 V supply range supports common low-voltage logic systems, and the INT output lets firmware react to a changed input rather than polling continuously. Use the interrupt pin only after configuring the relevant port and verifying the device's interrupt behavior in the manufacturer datasheet.
Được đề xuất
LED Status and Indicator Control
The TCA9554DBR can consolidate LED status indicators in consumer appliances, test equipment, and communication products behind a single I2C/SMBus connection. Eight outputs provide enough channels for power, activity, alarm, channel, or connection-state lamps, while configuration registers allow each bit to be managed independently. Compared with dedicating eight GPIO pins to simple indicators, the expander preserves host pins for timing- or communication-critical functions. Confirm output drive current, LED current limiting, polarity, and the supply relationship before finalizing the circuit.
Được đề xuất
Button and Keyboard Interface
The TCA9554DBR is appropriate for compact keypads, button panels, and human-interface modules because it provides eight digital input channels and an interrupt output. Firmware can configure the pins as inputs, detect a state change through INT, and then read the input register over I2C. This reduces wiring and host GPIO consumption in appliances, handheld instruments, and embedded control products. The interrupt path should be debounced according to the mechanical switch requirements, and the bus pull-ups and signal levels must be checked against the host controller.
Được đề xuất
Embedded Sensor and Peripheral Aggregation
The TCA9554DBR can aggregate digital sensor outputs, door or presence indicators, fault signals, and peripheral enables into a compact bus-connected interface. Its eight independently configurable ports support mixed input and output use, while the 400 kHz Fast-mode capability can help reduce bus time when the host must service multiple devices. This is valuable in battery-powered and compact embedded systems where the host has limited package space. The application still needs compatible logic levels, suitable pull-ups, and a defined reset strategy for reliable operation.
Được đề xuất
Appliance and Consumer Equipment Control
The TCA9554DBR fits appliances and consumer products that need a small number of low-speed digital controls alongside an embedded I2C host. Examples include mode indicators, button inputs, door controls, and auxiliary enable signals. Its 1.65 V minimum operating voltage is useful for modern low-voltage platforms, while the 5.5 V maximum supports conventional 5 V logic. Designers should ensure the host can generate the appropriate I2C levels and that the expander's port pins remain within their specified voltage and current limits.
Được đề xuất
Communication and Network Equipment Interfaces
In communication equipment, the TCA9554DBR can handle module-present, alarm, reset, enable, and indicator signals while the primary processor communicates through I2C/SMBus. The interrupt output provides an event-driven mechanism for reporting changed input lines, and the three address inputs allow several expanders to share a bus. In systems with strict EMC, thermal, or reliability requirements, apply the appropriate surge and filtering design, maintain short I2C routing, and verify the final logic-level and load conditions against the system specification.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho TCA9554DBR — 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 | TCA9554ADBR |
|---|---|---|
| Package | 16-pin SSOP (DB), 150 mil | 16-pin SSOP (DB), 150 mil - same |
| Brand | Texas Instruments | Texas Instruments |
| Number of I/O Ports | 8 | 8 |
| Supply Voltage Range | 1.65 V to 5.5 V | 1.65 V to 5.5 V |
| Maximum I2C Clock Frequency | 400 kHz | 400 kHz |
| Standard-Mode I2C Frequency | 100 kHz | 100 kHz |
| Interrupt Output | Yes | Yes |
| Hardware Address Inputs | 3, A0/A1/A2 | 3, A0/A1/A2 |
| Operating Temperature Range | -40 C to +85 C | -40 C to +85 C |
| RoHS Status | RoHS compliant | RoHS compliant |
Bảo phân biệt quan trọng
- Directly matches the DB SSOP footprint (vsTCA9554ADBR)
- Matches the core digital interface ratings (vsTCA9554ADBR)
- Supports multiple devices on one bus (vsTCA9554ADBR)
Ghi chú thiết kế
Place the TCA9554DBR close to the I2C controller and the devices whose signals it controls. Keep SDA and SCL routes short, avoid routing them adjacent to switching nodes or high-current return paths, and provide the required bus pull-ups. Confirm the pull-up voltage is compatible with the host and expander logic levels. The SSOP-16 footprint needs adequate solder-mask and component-clearance planning so that rework does not damage adjacent parts.
Decouple the TCA9554DBR supply close to the VCC and ground pins with the capacitance recommended by the manufacturer datasheet. Ensure the regulator can supply the device's normal operating current plus the current required by any connected output loads. Because the device operates across 1.65 V to 5.5 V, verify the selected bypass capacitors, pull-up voltage, and external logic levels at every intended supply condition rather than assuming 5 V compatibility.
Do not treat a related I/O expander as an automatic drop-in replacement. The DB package is a 16-pin SSOP, while some PWR alternatives use TSSOP-16 and may have different land patterns. Also check the interrupt polarity, default port states, address behavior, output-drive limits, and register map. These checks are essential when replacing TCA9554DBR in an existing PCB or transferring the design to a different package family.
Assign A0, A1, and A2 before routing the I2C bus so each device has a unique address. Keep address straps short and away from sources of leakage or unstable levels. If the INT line is used, route it as a controlled signal and account for its electrical state during reset and power sequencing. This prevents bus contention, duplicate addresses, and unintended host interrupts in multi-expander systems.
Thông tin tuân thủ
RoHS status is identified in the available product comparison information. REACH, lead-free, halogen-free, conflict-minerals, and automotive qualification status are not specified in the available manufacturer information.
