TCA9539PWR - 16-Bit I2C I/O Expander | Texas Instruments
MPN: TCA9539PWR ✓ Hoạt độngTCA9539PWR Tóm tắt
An I/O expander is an interface IC that extends the number of digital input or output pins available to a host processor. In the signal-chain hierarchy, it belongs to the I2C interface-controller family, connects to the broader interface-IC and semiconductor categories, and sits between embedded control systems and external sensors, switches, indicators, or logic inputs. The TCA9539 supports input, output, and mixed-direction operation for the 16 port lines.
The TCA9539 provides hardware-selectable A0 and A1 address inputs, allowing up to four devices to coexist on one I2C bus. Its interrupt output indicates when an input port changes state, allowing the host to avoid continuous polling. The reset and configuration registers provide defined startup and operating behavior, while power-on reset restores the default device state. Low-voltage operation supports systems built around modern embedded processors.
The device uses the I2C or SMBus two-wire protocol for communication. The TCA9539PWR is specified for 16 I/O channels, 400 kHz maximum clock frequency, and a 1.65 V to 5.5 V operating supply range. Its 24-TSSOP package is designed for surface-mount PCB assembly and provides a practical alternative to adding a second microcontroller or using a larger host package.
Typical applications include industrial control panels, sensor aggregation boards, LED and relay interfaces, battery-powered embedded systems, configurable GPIO modules, and compact consumer or communications equipment. The interrupt output is especially useful when multiple external inputs must be monitored while conserving host-processing time.
When laying out the circuit, place the device close to the associated connector or peripheral circuits and route the I2C lines away from high-current switching paths. Confirm pull-up resistor values against the bus voltage and capacitance. Use the manufacturer pin-description table when assigning PCB tracks and verify the device address, port direction, and reset state in firmware.
This page combines manufacturer specifications, compatible replacement guidance, comparison parameters, and practical design notes for engineers evaluating the TCA9539PWR in embedded I/O designs.
Bộ thay thế dễ dàng lắp đặt cho TCA9539PWR — 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 TCA9539PWR (cùng hình factor và footprint) — khác nhau ở Package, Supply Voltage Range, Interface, Product Type, Interrupt Output.
TCA9539QPWRQ1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TCA9539RTWR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PCA9539PWR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →TCA9535PWR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PCA9555PWR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →TCA9539PWR Thông số kỹ thuật
| Product Type | 16-bit I2C and SMBus low-power I/O expander |
| Number of I/O Lines | 16 |
| Operating Supply Voltage Range | 1.65 V to 5.5 V |
| Maximum I2C Clock Frequency | 400 kHz |
| Serial Interface | I2C and SMBus |
| Hộp | 24-pin TSSOP (PW) |
| Kiểu lắp đặt | Surface mount |
| Address Inputs | A0 and A1 hardware-selectable inputs |
| Maximum Devices per I2C Bus | 4 |
| Interrupt Output | Yes |
| Reset Input | Yes |
| Configuration Registers | Yes |
| Power-On Reset | Yes |
| Port Operation | Input, output, or mixed-direction operation |
| Number of Supply Pins | 2 |
Hướng dẫn cấu hình chân TCA9539PWR 24-pin tssop (pw)
Cấu hình chân cho TCA9539PWR (24-pin tssop (pw) 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 TCA9539PWR.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
TCA9539PWR phù hợp cho 6 Áp dụngs: Industrial Control Panel Interface, Sensor Aggregation Module, LED and Relay Control, Low-Voltage Embedded System, Communications Equipment, Battery-Powered Controller.
Industrial Control Panel Interface
The TCA9539PWR is a practical choice for industrial control panels requiring more digital lines than the host controller can provide directly. Its 16 I/O ports can operate as inputs for limit switches, interlocks, and panel status signals, or as outputs for indicator and actuator control. The 1.65 V to 5.5 V operating range supports common control-rail voltages, while the interrupt output lets the processor respond to changing input states without continuous polling. Use the A0 and A1 pins to assign distinct bus addresses when several panels or expansion groups share one I2C bus.
Được đề xuất
Sensor Aggregation Module
TCA9539PWR fits sensor-aggregation boards where multiple digital sensors, switches, or discrete status lines must be connected to a compact host processor. The 16 ports support input, output, or mixed configurations, allowing one serial bus to handle both sensed events and control signals. Its interrupt output improves responsiveness by signaling a changed input instead of requiring constant polling at 400 kHz bus speed. The wide 1.65 V to 5.5 V supply range is useful when sensors operate from different low-voltage rails, although each attached circuit must share a compatible logic reference.
Được đề xuất
LED and Relay Control
The TCA9539PWR can provide a compact control interface for LEDs, relay drivers, latches, and other discrete actuators that would otherwise consume many host GPIO pins. Sixteen configurable outputs free the processor for application logic and simplify the connector layout. Because the device is a digital I/O expander rather than a power driver, each output must remain within its specified current and voltage limits, and suitable transistor or driver stages are needed for relays and high-current loads. The interrupt input capability also allows selected status lines to be monitored alongside outputs.
Được đề xuất
Low-Voltage Embedded System
TCA9539PWR is suited to low-voltage embedded platforms where adding a larger host package solely for GPIO expansion would be inefficient. Operation from 1.65 V to 5.5 V supports processors operating around 1.8 V, 2.5 V, or 3.3 V, while the I2C interface reduces the number of physical connections. Mixed input/output operation supports compact keyboard, display, communication, and peripheral-control designs. Firmware should configure each port direction explicitly and use the interrupt mask registers to prevent unnecessary wakeups.
Được đề xuất
Communications Equipment
The TCA9539PWR can extend a communications module with front-panel indicators, equipment-enable signals, alarm inputs, and configuration switches. Its I2C/SMBus connectivity allows the communications controller to manage up to 16 lines while sharing the bus with other peripherals. A maximum bus clock of 400 kHz provides sufficient bandwidth for status updates, and the interrupt output supports prompt alarm handling. The TSSOP-24 footprint keeps the expansion compact, but board layout must preserve I2C signal integrity by minimizing trace length and keeping the bus away from noisy power-conversion paths.
Được đề xuất
Battery-Powered Controller
TCA9539PWR is useful in battery-powered controllers that need flexible digital I/O without adding a dedicated microcontroller or large GPIO package. Its low-voltage operation from 1.65 V to 5.5 V and interrupt mechanism can reduce unnecessary bus activity by allowing the host to sleep until an input event occurs. Sixteen ports can support wake sources, status LEDs, mode controls, and low-current peripherals. Firmware should disable unused ports and configure the interrupt mask to prevent false wakeups, while the power design must honor the device's specified operating range and supply requirements.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho TCA9539PWR — 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 | TCA9539QPWRQ1 | TCA9539RTWR | PCA9539PWR | TCA9535PWR | PCA9555PWR |
|---|---|---|---|---|---|---|
| Package | TSSOP-24 (PW) | TSSOP-24 (PW) | TSSOP-24 (PW) | TSSOP-24 (PW) | TSSOP-24 (PW) | TSSOP-24 (PW) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Number of I/O Lines | 16 | 16 | 16 | 16 | 16 | 16 |
| Serial Interface | I2C and SMBus | I2C and SMBus | I2C and SMBus | I2C | I2C | I2C |
| Interrupt Output | Yes | Yes | Yes | Yes | Yes | Yes |
| Hardware Address Inputs | A0 and A1 | A0 and A1 | A0 and A1 | A0 and A1 | A0, A1, and A2 | A0, A1, and A2 |
| Reset and Configuration Registers | Yes | Yes | Yes | Yes | Yes | Yes |
Bảo phân biệt quan trọng
- Direct same-family automotive qualification path (vsTCA9539PWR)
- Native 1.65 V to 5.5 V operating range (vsPCA9539PWR)
- Two address pins support four devices per bus (vsPCA9555PWR)
Ghi chú thiết kế
Place the TCA9539PWR near the connector or peripheral pins it serves to minimize trace length on the 16 I/O nets. Keep the I2C SCL and SDA routes short, route them away from switching-regulator inductors and high-current relay paths, and provide a continuous ground reference. Use the manufacturer's 24-pin TSSOP footprint and pin-description table to verify pad locations before fabrication.
Decouple VCC locally with the capacitance recommended by the manufacturer datasheet and place the capacitor close to the supply pins. Ensure the regulator can supply the device across the complete 1.65 V to 5.5 V operating range and that the I2C pull-up voltage is appropriate for the bus. Do not exceed the electrical limits listed for any output port, especially when driving external circuitry.
Calculate I2C pull-up resistance from the bus voltage, total bus capacitance, and required rise time. Confirm that the resulting pull-up current remains within the device and controller limits at the lowest operating voltage. Keep the bus topology short and avoid unnecessary stubs; if long cables or multiple branches are unavoidable, use an appropriate bus buffer or redesigned distribution.
Configure every port direction and output latch value before enabling the corresponding interrupt path. Incorrect startup port states can create unintended output transitions, so use the reset and power-on-reset behavior deliberately. When substituting another 16-bit expander, verify the register map, slave address, A0/A1 behavior, reset polarity, and interrupt-clearing procedure even when the package is identical.
Thông tin tuân thủ
The standard TCA9539PWR is not identified as an automotive-qualified ordering option. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status require confirmation from the manufacturer product documentation or declaration.