PCA9534APW - 8-Bit I2C I/O Expander | Texas Instruments
MPN: PCA9534APW ✓ AktifPCA9534APW Genel Bakış
An I2C I/O expander is a bus-interface integrated circuit that translates serial commands into parallel digital input or output operations. Its position in the hierarchy is I/O expander, interface controller, interface IC, and integrated circuit. This makes the PCA9534APW useful when a microcontroller or processor requires more general-purpose I/O pins than its package can provide directly.
The device combines an 8-bit parallel I/O port, configurable input and output registers, and an active-low open-drain interrupt output. Address pins A0, A1, and A2 allow up to eight devices to share an I2C or SMBus bus. Low standby-current consumption of 1 uA maximum helps suit low-power embedded systems, while the 2.3 V to 5.5 V supply range supports both 3.3 V and 5 V system rails.
The PCA9534A register organization includes separate port, input, output, polarity-inversion, and configuration registers, allowing each I/O line to be configured independently. This register-based control supports more flexible interrupt and input-polarity handling than simple fixed-function GPIO devices. The 400 kHz I2C interface rate provides sufficient bandwidth for routine control and status traffic.
Typical applications include industrial control modules, programmable logic controllers, sensor-hub boards, appliance interfaces, LED-control boards, and compact embedded control systems. The device is particularly useful when a controller has limited spare pins but the PCB can accommodate another TSSOP-16 component and its address-selection wiring.
PCB design should place the I2C pull-up resistors and device decoupling capacitor close to the relevant pins. Confirm address-strapping levels for every expander on the shared bus to prevent address conflicts, and route the active-low interrupt signal away from high-current switching nodes.
This page combines device specifications, package and pin information, interface guidance, drop-in replacement candidates, and application-focused engineering notes to support faster component selection and PCB implementation.
Drop-in alternatifler için PCA9534APW — aynı paket, pin-başına uyumlu. PCB yeniden montajı gerektiren farklı paket bileşenleri dışlanmıştır.
Bu Serideki Variantlar
Yedek parça uyumlu olan aynı serideki modeller PCA9534APW (aynı form faktörü ve ayağa oturma).
PCA9554PW
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →PCA9534T
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
PCA9554TS
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
PCA9534APW Özellikler
| Number of I/O Lines | 8 lines |
| I/O Port Width | 8 bits |
| Supply Voltage Range | 2.3 V to 5.5 V |
| I2C/SMBus Maximum Frequency | 400 kHz |
| Arayüz Türü | I2C and SMBus |
| Interrupt Output | Active-low, open-drain |
| Configuration Registers | 8-bit |
| Hardware Address Inputs | 3 inputs |
| Maximum Devices per Bus | 8 devices |
| Standby Current Consumption | 1 uA maximum |
| İşletim Sıcaklığı Aralığı | -40 °C to 85 °C |
| Paket | 16-pin TSSOP |
| Pin Sayısı | 16 pins |
| Montaj Türü | Surface mount |
| Device Type | General-purpose I/O expander |
| Bus Addressing | Hardware-selectable I2C address |
| RoHS Durumu | Compliant |
PCA9534APW Pin Yapısı
| Pin 1 | A0 — Hardware address input A0 |
| Pin 2 | A1 — Hardware address input A1 |
| Pin 3 | A2 — Hardware address input A2 |
| Pin 4 | P0 — General-purpose I/O port P0 |
| Pin 5 | P1 — General-purpose I/O port P1 |
| Pin 6 | P2 — General-purpose I/O port P2 |
| Pin 7 | P3 — General-purpose I/O port P3 |
| Pin 8 | GND — Ground connection |
| Pin 9 | P4 — General-purpose I/O port P4 |
| Pin 10 | P5 — General-purpose I/O port P5 |
| Pin 11 | P6 — General-purpose I/O port P6 |
| Pin 12 | P7 — General-purpose I/O port P7 |
| Pin 13 | INT — Active-low, open-drain interrupt output |
| Pin 14 | VCC — Power supply connection |
| Pin 15 | SCL — Serial clock input |
| Pin 16 | SDA — Serial data input and output |
Tipik Uygulamalar
PCA9534APW için uygundur 6 uygulamas: Industrial Control and PLC Interface, Sensor Hub and Remote I/O Module, LED and Display Control, Appliance Control Panel, Programmable Logic and Communication Control, Battery-Powered Portable Equipment.
Industrial Control and PLC Interface
The PCA9534APW fits industrial controller boards that need additional discrete inputs and outputs beyond the host controller's native pins. Its eight independently configurable I/O lines connect switches, sensors, relay-control signals, and status indicators, while the 2.3 V to 5.5 V supply range accommodates common 3.3 V and 5 V control rails. The 400 kHz I2C rate is suitable for routine register updates and status polling, and the active-low open-drain interrupt output lets the controller react to input changes without continuous bus polling. Address pins A0, A1, and A2 support multiple expanders when a machine interface requires more than eight lines.
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Sensor Hub and Remote I/O Module
The PCA9534APW is useful in sensor-hub assemblies where sensors, switches, and alarms require more GPIO than the primary controller can expose. Eight ports can monitor discrete sensor outputs or drive module-enable and alarm-reset signals. The three address inputs allow several expanders to share an I2C bus, reducing wiring complexity in distributed sensing equipment. With a maximum bus frequency of 400 kHz and an operating range of 2.3 V to 5.5 V, the device supports common embedded system rails. The active-low interrupt output can provide a compact hardware indication that one or more configured input states changed.
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LED and Display Control
The PCA9534APW can provide a simple parallel control interface for LEDs, status lamps, and display-enable signals in compact control boards. Firmware can set output states through the I/O registers, allowing multiple lighting functions to be coordinated without consuming host-controller pins. Its 16-pin TSSOP package is practical for space-constrained boards, and the 2.3 V to 5.5 V operating range supports both low-voltage portable systems and 5 V industrial logic. If the LED load requires more current than an I/O line can source directly, use the port as a control input for an external transistor or driver stage.
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Appliance Control Panel
The PCA9534APW fits appliance electronics that combine a limited-pin microcontroller with a separate front-panel interface. Its eight I/O lines can read buttons and selectors or drive indicators, relay interfaces, and display controls. A 400 kHz I2C connection provides responsive panel updates without consuming the larger number of parallel pins that a direct host-controller implementation would require. The 2.3 V to 5.5 V range supports multiple embedded supply rails, while low standby consumption of 1 uA maximum is beneficial in appliances that spend substantial time idle. Firmware should debounce mechanical inputs and account for the device's open-drain interrupt behavior.
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Programmable Logic and Communication Control
The PCA9534APW can serve as a companion I/O controller beside a microcontroller, DSP, or programmable logic device that needs extra configuration and handshake signals. The eight ports may drive module resets, mode controls, carrier enables, or status flags. The 400 kHz I2C/SMBus interface is appropriate for low-bandwidth configuration traffic, and three hardware address inputs allow multiple expander chips to coexist on one bus. Because the device supports both I2C and SMBus signaling, it can bridge control requirements in mixed embedded architectures. Its 16-pin TSSOP footprint also allows reuse of existing small-format board layouts when the voltage and interrupt behavior match.
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Battery-Powered Portable Equipment
The PCA9534APW is appropriate for battery-powered portable equipment that needs a small, low-power I/O expansion path. Its standby-current consumption is rated at 1 uA maximum, helping reduce current draw when the portable product is idle. The 2.3 V minimum supply voltage supports low-energy operating rails, while the 5.5 V maximum provides flexibility across portable subsystems. Eight I/O lines can handle user buttons, indicator LEDs, or power-control signals without expanding the main controller package. The active-low open-drain interrupt output allows the system to wake or prompt the host after a relevant input event rather than continuously polling the I2C bus.
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Önerilen Ürünler Özeti
Mühendislik referans verileri: PCA9534APW — karşılaştırma, tasarım rehberi ve uyumluluk bilgileri.
Seçim Kılavuzu
Alternatiflerle Karşılaştırma
| Parametre | Bu Ürün | PCA9554PW | PCA9534T | PCA9554TS |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | NXP | NXP |
| Package | 16-pin TSSOP | 16-pin TSSOP | 16-pin TSSOP | 16-pin TSSOP |
| I/O Port Width | 8 bits | 8 bits | 8 bits | 8 bits |
| Supply Voltage Range | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V |
| Maximum I2C/SMBus Frequency | 400 kHz | 400 kHz | 400 kHz | 400 kHz |
| Internal I/O Pull-Up Resistors | Not present | Present | Not present | Present |
| Interrupt Output | Active-low, open-drain | Active-low, open-drain | Active-low, open-drain | Active-low, open-drain |
| Hardware Address Inputs | 3 inputs | 3 inputs | 3 inputs | 3 inputs |
| Maximum Devices per Bus | 8 devices | 8 devices | 8 devices | 8 devices |
Ana Farklılayıcılar
- Lower-power configuration without internal I/O pull-up resistors (karşılaştırma:PCA9554PW)
- Directly compatible family behavior and addressing (karşılaştırma:PCA9534T)
- Same TSSOP footprint with selectable internal-pull-up behavior (karşılaştırma:PCA9554TS)
Tasarım Notları
Place the SCL and SDA pull-up resistors close to the bus master or at a location that minimizes the unterminated branch length. The PCA9534 family does not provide the internal I/O pull-up arrangement of the PCA9554, so external pull-ups should be fitted according to the bus voltage, capacitance, and required rise time. Confirm each A0, A1, and A2 strap level during schematic review to prevent two expanders from receiving the same fixed address.
Route the 16-pin TSSOP footprint with the standard pin-1 orientation used by the selected PCB library and verify it against the manufacturer pin diagram. Keep the interrupt trace away from switching nodes and high-current load paths because the output is open-drain and requires an external pull-up. Decouple VCC locally with the capacitor value specified by the device's application guidance, and maintain a short return path to the device ground pin.
Do not assume that a PCA9554 is an unconditional electrical substitute for a PCA9534A. The PCA9554 includes internal I/O pull-up resistors, while the PCA9534 removes them to reduce standby consumption, so substituting without reviewing the board may change bus loading and current draw. Also validate the interrupt polarity, input-polarity inversion, register map, and firmware initialization sequence before production use. A footprint match alone does not guarantee software compatibility.
Use a supply within the 2.3 V to 5.5 V operating range and ensure logic-high and logic-low levels at every device on the shared bus. The address and SCL pins are inputs, while SDA is bidirectional; pull-up sizing should satisfy the complete bus network rather than a single PCA9534APW. Review low-current standby behavior together with the pull-up network because continuously energized pull-ups can dominate the power budget of a battery-powered design.
Uyumluluk Bilgisi
The cross-reference record identifies the Texas Instruments family as RoHS compliant. REACH, halogen-free status, conflict-minerals status, and AEC-Q100 qualification are not explicitly stated for the exact PCA9534APW orderable device.