PCA9534PW - 8-Bit I2C I/O Expander | NXP Semiconductors
MPN: PCA9534PW ✓ Hoạt độngPCA9534PW Tóm tắt
An I/O expander is an interface IC that extends a host microcontroller or processor through a serial bus instead of consuming eight parallel pins. The PCA9534 belongs to the I/O expander hierarchy, expands GPIO resources, and connects through the I2C interface to embedded control systems. Its low-power design is useful when the additional lines must remain available without continuously increasing the power budget.
The PCA9534 provides eight general-purpose parallel input or output ports, an interrupt output, and configuration registers. Three hardware address pins, A0, A1, and A2, program the device address and permit multiple expanders on one I2C bus. Its 400 kHz bus capability and 2.3 V to 5.5 V operating range make it suitable for common embedded 3.3 V and 5 V systems.
The device is compatible with I2C and SMBus-oriented system architectures and is designed to simplify firmware-controlled expansion of external controls and sensed signals. Inputs and outputs can be configured according to system requirements, while the interrupt output allows a controller to respond when an enabled input changes. The verified product information specifically describes PCA9534PW as the low-power TSSOP16 version of the PCA9554 family, with internal I/O pull-up resistors removed.
Typical applications include industrial control boards, sensor interfaces, LED and relay-control boards, compact embedded modules, and small controller platforms that need extra parallel lines without redesigning the host package. The TSSOP-16 package also supports standard surface-mount assembly, although the exact pin names and dimensions must be confirmed in the manufacturer datasheet before layout.
Designers should verify address selection, pull-up requirements, voltage compatibility, and interrupt polarity on the assembled PCB. Because the verified material identifies pin and I2C compatibility with PCF8574 while also requiring software changes, firmware should be reviewed when migrating between those devices. This page combines verified NXP, TI, and distributor information with application guidance and sourcing notes.
Bộ thay thế dễ dàng lắp đặt cho PCA9534PW — 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 PCA9534PW (cùng hình factor và footprint) — khác nhau ở Package, Interrupt Output, Interface, Operating Temperature, Bus Interface.
PCA9534PWR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PCA9534PW
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PCA9534PW,118
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PCA9534PW,112
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PCA9534
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PCA9534PW Thông số kỹ thuật
| Device Type | 8-bit CMOS I2C-bus and SMBus low-power I/O port expander |
| Number of GPIO Pins | 8 |
| Supply Voltage Range | 2.3 V to 5.5 V |
| I2C Bus Frequency | 400 kHz |
| Giao diện | I2C-bus and SMBus |
| Interrupt Output | Yes |
| Configuration Registers | Yes |
| Address Configuration Pins | A0, A1, and A2 |
| Maximum Devices Sharing Bus | 8 devices per manufacturer data |
| Internal I/O Pull-up Resistors | Removed |
| Hộp | 16-pin TSSOP |
| Số chân | 16 pins |
| Kiểu lắp đặt | Surface Mount |
| PCF8574 Compatibility | Pin-to-pin and I2C address compatible; software changes required |
| Manufacturer | NXP Semiconductors |
| Trạng thái vòng đời | Active |
Hướng dẫn cấu hình chân PCA9534PW 16-pin tssop
Cấu hình chân cho PCA9534PW (16-pin tssop 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 PCA9534PW.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
PCA9534PW phù hợp cho 6 Áp dụngs: Embedded Sensor Control, Industrial Control Interface, LED and Relay Control, Communication and Network Equipment, Portable and Wearable Devices, Test and Measurement Front Panels.
Embedded Sensor Control
The NXP PCA9534PW fits embedded sensor-control boards where a host controller needs more discrete control lines without spending eight parallel GPIO pins. Its eight I/O ports can drive sensor enables, reset inputs, mode selectors, or digital status connections while the 2.3 V to 5.5 V supply range supports common embedded rails. The I2C/SMBus interface operates up to 400 kHz, and the interrupt output can notify the controller of selected input changes. Designers should verify signal levels, pull-ups, address straps, and whether any external buffering is required for the attached sensor.
Được đề xuất
Industrial Control Interface
PCA9534PW is useful in compact industrial controller boards that need discrete control and status lines distributed across a serialized bus. The eight ports can represent relay-enable signals, interlock status, mode controls, or isolated digital interface points, while A0, A1, and A2 allow address differentiation when several expanders share one bus. Its TSSOP-16 package supports surface-mount assembly and its 2.3 V to 5.5 V range fits many 3.3 V and 5 V control platforms. Industrial qualification details and electrical limits must be checked separately.
Được đề xuất
LED and Relay Control
The PCA9534PW can add eight low-power digital control outputs to a controller board for LEDs, relay drivers, or other discrete actuators, subject to the current and voltage limits of the attached circuits. The host writes output states over I2C rather than driving each line directly from a microcontroller package. The interrupt feature is more relevant to inputs than actuator feedback, but the shared I2C bus keeps the wiring compact. Use appropriate transistor or driver stages for loads beyond the device's verified output capability and confirm all absolute maximum values in the datasheet.
Được đề xuất
Communication and Network Equipment
PCA9534PW fits network-accessory and communication boards that need miscellaneous control lines for indicators, connectors, reset circuits, or peripheral enables. The I2C/SMBus connection can share a bus with other addressable devices, while A0, A1, and A2 provide hardware address selection for multiple expanders. Its 400 kHz maximum bus rate is suitable for many embedded control links, but longer or heavily loaded buses require rise-time and pull-up analysis. Firmware should define the register map and avoid assuming that PCF8574 software will operate without modification.
Được đề xuất
Portable and Wearable Devices
The low-power PCA9534PW can expand control and status pins in a compact portable product where PCB area and serial connectivity matter more than parallel host-controller pins. Eight programmable I/O lines can support user controls, indicators, sensor gating, or peripheral mode selection. Its 2.3 V to 5.5 V operating range is broad enough for common embedded supplies, while the TSSOP-16 package keeps the footprint compact. Actual battery-life impact depends on the selected output states and whether external pull-ups or loads remain active.
Được đề xuất
Test and Measurement Front Panels
PCA9534PW can add front-panel control lines for instrument boards, including range-select signals, relay-control requests, status indicators, and external interface enables. The eight I/O ports reduce the number of direct host-controller connections, while the interrupt output can report selected input changes when a control line changes state. The 400 kHz bus rate is adequate for many control-panel tasks, but the instrument’s grounding, isolation, and safety architecture must be designed around the application. Confirm output loading and polarity requirements before layout.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PCA9534PW — 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 | PCA9534PWR | PCA9534PW | PCA9534PW,118 | PCA9534PW,112 | PCA9534 |
|---|---|---|---|---|---|---|
| Package | TSSOP-16 | TSSOP-16 | TSSOP-16 | TSSOP-16 | TSSOP-16 | TSSOP-16 |
| Brand | NXP Semiconductors | Texas Instruments | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | Texas Instruments |
| I/O Count | 8 bits | 8-bit I/O expander | 8-bit I/O expander | 8-bit I/O expander | 8-bit I/O expander | 8-bit I/O expander |
Bảo phân biệt quan trọng
- Eight I/O lines with configuration registers (vsPCA9534)
- NXP low-power positioning (vsPCA9534PWR)
- PCF8574 migration path (vsPCF8574T)
- Addressable multi-expander support (vsPCA9534)
Ghi chú thiết kế
Treat the PCA9534PW as an I2C peripheral on the same bus as other addressable devices. Route SCL and SDA with short, controlled paths and verify pull-up placement according to the host voltage and bus capacitance. The A0, A1, and A2 address straps should be placed so that programming remains deterministic and does not float. The supplied data confirms the 16-pin TSSOP package but does not provide a verified PCB land pattern, so use the NXP package drawing for manufacturing.
Confirm that every I/O signal remains within the device's input, output, and absolute maximum limits before finalizing external connections. The verified data establishes a 2.3 V to 5.5 V supply range, but it does not provide individual pin current limits in the supplied snippets. If an output drives a relay, LED bank, or other load, use an appropriate transistor or driver stage and account for its voltage drop. Keep the PCA9534PW supply decoupling close to the device according to the manufacturer layout guidance.
Do not assume that PCF8574 firmware can be reused without review. Manufacturer information explicitly states that the PCA9534 is pin-to-pin and I2C-address compatible with PCF8574, while enhanced behavior requires software changes. Check the PCA9534 port and interrupt register behavior, address map, and reset sequence. Also remember that the verified NXP description identifies the device as the low-power PCA9554 version with internal I/O pull-up resistors removed, which can alter external circuit behavior.
The maximum stated bus rate is 400 kHz, but the usable rate still depends on bus capacitance, pull-up resistance, clock rise time, and the host timing budget. Estimate the RC rise-time relationship using the actual bus capacitance and pull-up resistance, then verify it with an oscilloscope on the assembled board. If the bus is long, heavily loaded, or heavily branched, reduce the rate or use a suitable bus repeater or redesigned routing.
Thông tin tuân thủ
The supplied verified search results do not explicitly provide RoHS, REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 statements for the NXP PCA9534PW. Values remain unknown rather than assumed.