TCA9534DWR - 8-Bit I2C I/O Expander | Texas Instruments
Teilenummer: TCA9534DWR ✓ AktivTCA9534DWR Übersicht
An I/O expander is an interface IC that increases the number of digital input and output lines available to a microcontroller or embedded processor. The TCA9534 belongs to the I/O expander class within interface ICs and power-management ecosystems, using a two-wire serial bus to exchange register data with a host. It is particularly useful when a system needs a few additional control, status, or monitoring signals without assigning dedicated host-controller pins to each function.
Key device features include eight configurable I/O pins, three I2C address inputs, and operation across a 1.65 V to 5.5 V supply range. The device supports I2C and SMBus communication at frequencies up to 100 kHz or 400 kHz. An interrupt output provides a hardware indication that an input or output state has changed, while the configuration registers control port direction and polarity behavior for individual pins.
The TCA9534DWR supports both input and output operation for its eight-port group. Register-based configuration allows the firmware to select input or output directions, read input levels, and update output values. The three address inputs permit multiple expanders to share the same bus when the system requires additional I/O. Because the device includes configuration registers, application software can define port behavior without requiring a separate external GPIO controller.
Typical applications include industrial control panels, sensor and relay interfaces, LED status panels, battery-powered instrumentation, programmable logic controllers, and compact embedded systems. The wide 1.65 V to 5.5 V operating range also makes the device suitable for mixed-voltage systems where the host operates below the conventional 5 V logic level. The interrupt output can reduce unnecessary host polling when an attached switch, sensor, or other external event changes state.
Designers should confirm the board voltage, I2C pull-up arrangement, address configuration, and input thresholds before layout. The SDA and SCL pins require appropriate bus pull-ups, while address pins must be connected to valid logic levels before the device begins communicating. Decoupling and signal-integrity practices are especially important when the expander sits near long cables, switching regulators, or electrically noisy equipment.
This product overview combines the device architecture, operating limits, bus behavior, application guidance, and drop-in comparison information to support faster engineering selection. It also highlights practical layout and firmware considerations that help engineers evaluate the TCA9534DWR within the complete embedded-control system rather than treating it only as a list of basic parameters.
Drop-in-Alternativen für TCA9534DWR – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
TCA9534A DWR
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
PCA9534A DWR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
PCA9534 DWR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
TCA9534DWR Technische Daten
| Device Type | 8-bit I2C/SMBus I/O expander |
| Number of I/O Ports | 8 ports |
| Operating Supply Voltage Range | 1.65 V to 5.5 V |
| Maximum I2C Bus Frequency | 400 kHz |
| Standard I2C Bus Frequency | 100 kHz |
| Schnittstellentyp | I2C/SMBus |
| Number of Address Inputs | 3 inputs |
| Interrupt Output | Yes |
| Configuration Registers | Yes |
| Betriebstemperaturbereich | -40 °C to +85 °C |
| Gehäuse | SOIC-16 (DW) |
| Anzahl der Pins | 16 pins |
| Montageart | Surface mount |
| Shipping Package | Tape and reel |
| Maximum Supply Voltage | 5.5 V |
TCA9534DWR tape and reel Pinbelegungsleitfaden
Pinbelegung für TCA9534DWR (tape and reel-Gehäuse). Pin-Nummerierung, Funktionen und Anschlussdiagramme sind im Herstellerdatenblatt definiert. Entnehmen Sie diesem den genauen Footprint und Lötrichtlinien.
Keine detaillierten Pinbelegungsdaten verfügbar für TCA9534DWR.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
TCA9534DWR ist geeignet für 6 Anwendungs: Industrial Control Panel, Sensor and Switch Interface, LED Status and Control Panel, Programmable Logic Controller, Battery-Powered Instrumentation, Battery Management and Charger Control.
Industrial Control Panel
The TCA9534DWR is useful for expanding a controller that already handles communication and computation but needs additional discrete control and status lines. Its eight configurable ports can drive relay indicators, panel lamps, mode-selection inputs, or interlock-status signals while the host accesses them through I2C/SMBus registers. The 1.65 V to 5.5 V operating range supports both low-voltage control electronics and conventional 5 V industrial interfaces. Using the dedicated interrupt output allows the controller to react to a changed panel condition without continuously polling all eight ports, reducing bus activity and firmware complexity.
Empfohlen
Sensor and Switch Interface
The TCA9534DWR can consolidate multiple discrete sensors, switches, and digital status inputs behind an I2C/SMBus controller. Each port is configured through the device registers, allowing inputs to be read in groups and making the expander suitable for limit switches, door contacts, presence indicators, or digital alarm lines. Its maximum bus frequency of 400 kHz supports efficient register access, while the interrupt output identifies a state change at the hardware level. Firmware should debounce mechanical contacts in software and distinguish input events from output-state changes through the appropriate register operation.
Empfohlen
LED Status and Control Panel
The TCA9534DWR provides a compact way to control several status LEDs or low-current panel indicators from a host that has limited GPIO resources. Each of the eight ports can be configured as an output and updated through the I2C/SMBus interface, allowing firmware to group related indicators by function. The device operates from 1.65 V to 5.5 V, which accommodates systems combining low-voltage logic with appropriately rated indicator circuitry. For high-current lamps, use the expander only for logic-level control of a suitable driver rather than driving the lamp directly.
Empfohlen
Programmable Logic Controller
The TCA9534DWR is a practical peripheral for programmable logic controllers that need more digital endpoints than their main controller package exposes. Eight ports can handle pushbuttons, relay-control requests, valve indicators, or interlock signals while preserving the primary bus for field communication. The 100 kHz and 400 kHz operating options align with common embedded serial-bus systems, and the interrupt output supports event-driven control behavior. Address inputs allow multiple expanders to coexist when additional endpoints are required, subject to careful bus pull-up and address-allocation planning.
Empfohlen
Battery-Powered Instrumentation
The TCA9534DWR can extend a low-power instrument without requiring the main microcontroller to devote multiple pins to simple controls or indicators. Its 1.65 V minimum operating voltage supports low-voltage embedded systems, while the interrupt output lets the host sleep until an external status change requires attention. The device can read sensor-control signals, operate digital isolator enables, or manage low-current status indicators. Designers should evaluate standby-current requirements in the complete power budget and confirm that the I2C pull-ups do not create excessive static dissipation.
Empfohlen
Battery Management and Charger Control
The TCA9534DWR can add discrete control and monitoring lines around a battery-management system, such as charger-enable requests, power-path status inputs, or external protection-device controls. Eight ports make it possible to group low-bandwidth signals without increasing the pin count of the primary charger or battery-management IC. Register-based direction control permits the same port group to handle both inputs and outputs, and the interrupt output supports immediate notification of an unexpected state change. The external circuit must remain compatible with the battery system’s voltage range, which may differ from the expander’s operating limits.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für TCA9534DWR – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | TCA9534A DWR | PCA9534A DWR | PCA9534 DWR |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | NXP | NXP |
| Package | SOIC-16 (DW) | SOIC-16 (DW) - same | SOIC-16 (DW) - same | SOIC-16 (DW) - same |
| Configuration Registers | Yes | Yes | Yes | Yes |
Wichtigste Unterscheidungsmerkmale
- Wide low-voltage operating range (vs. PCA9534A DWR)
- 400 kHz serial-bus capability (vs. PCA9534 DWR)
- Dedicated event notification (vs. TCA9534A DWR)
Designhinweise
Place the device near the connector or peripheral group that it serves to keep I/O traces short. Route SDA and SCL away from switching nodes and maintain continuous ground return beneath the serial-bus traces. Pull-up resistors should be placed at the physical bus location recommended by the system architecture, particularly when the TCA9534DWR is one device on a longer multi-node bus.
Check pull-up strength against the 1.65 V to 5.5 V operating range, the 400 kHz bus target, total bus capacitance, and the distance to the host and peripheral devices. The same resistor value that works at 5 V may produce excessive rise time at 1.65 V. Measure the bus at the farthest endpoint when cables, connectors, or several expanders are present.
Configure the address inputs to valid logic levels before the device is enabled and confirm that multiple expanders use unique addresses. Firmware should initialize port direction, input polarity, and interrupt-mask registers in a defined order. Also verify whether an attached signal should be inverted, because the polarity register changes how an input is interpreted rather than changing the physical interface.
Compliance-Informationen
The manufacturer product page and ordering information identify the electrical and package characteristics, but no specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations were found for this orderable MPN.
