TCA9534DWT - 8-Bit I2C I/O Expander | Texas Instruments
MPN: TCA9534DWT ✓ NakahandaTCA9534DWT Ulas
An I2C I/O expander is an interface IC that increases the number of digital input and output lines available to a host processor. The TCA9534DWT uses a two-wire bidirectional I2C or SMBus connection for register access, while the eight external pins can be configured individually as inputs or outputs. This makes it useful for reducing microcontroller pin count in control, sensing, and actuator systems.
The TCA9534DWT provides separate input and output configuration registers, allowing each of the eight ports to be used as an input or output. It also includes an interrupt output for change detection on configured input ports. The 1.65 V to 5.5 V operating range supports low-voltage digital systems, while 100 kHz and 400 kHz bus operation accommodates both standard and faster embedded communication requirements.
The 16-pin SOIC package provides a compact surface-mount footprint for industrial, consumer, communications, and embedded-control equipment. The device is designed for systems that need more general-purpose digital I/O without adding a larger processor or complex programmable logic. The manufacturer product page identifies the TCA9534 family as an I2C/SMBus interface IC with interrupt and configuration registers.
Typical applications include relay and solenoid control, LED status and indicator interfaces, keypad or button scanning, sensor input collection, and expansion of a microcontroller's available digital lines. The TCA9534DWT is particularly appropriate when a bus-connected peripheral can reduce wiring complexity and preserve host-controller pins for communications, timing, or analog functions.
When designing around the TCA9534DWT, confirm the address configuration and electrical limits against the manufacturer datasheet before layout. Use appropriate pull-up resistors on the I2C bus and account for the operating voltage of both the expander and connected peripherals. This page combines the manufacturer product information, distributor references, package details, application guidance, and drop-in comparison information for engineering review.
Mga alternatibo na pwedeng ilagay na TCA9534DWT — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
TCA9534DWR
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Tingnan ang Datasheet →TCA9534DWT Mga Spesipikasyon
| Product Type | 8-bit I2C/SMBus I/O expander |
| Number of I/O Ports | 8 bits |
| Supply Voltage Range | 1.65 V to 5.5 V |
| Minimum Operating Voltage | 1.65 V |
| Maximum Operating Voltage | 5.5 V |
| I2C Standard-mode Frequency | 100 kHz |
| I2C Fast-mode Frequency | 400 kHz |
| Protocol Support | I2C and SMBus |
| Register Features | Interrupt and configuration registers |
| Bilang ng Pins | 16 pins |
| Packhaging | 16-pin SOIC |
| Uri ng Pagpapasok | Surface mount |
| I/O Configuration | Individually configurable input/output ports |
| Interrupt Output | Yes |
| Address Configuration | A0, A1, and A2 address inputs |
Pin Configuration ng TCA9534DWT
| Pin 1 | INT — Interrupt output |
| Pin 2 | A0 — Address input A0 |
| Pin 3 | A1 — Address input A1 |
| Pin 4 | A2 — Address input A2 |
| Pin 5 | P0 — General-purpose I/O port 0 |
| Pin 6 | P1 — General-purpose I/O port 1 |
| Pin 7 | P2 — General-purpose I/O port 2 |
| Pin 8 | P3 — General-purpose I/O port 3 |
| Pin 9 | VSS — Ground reference |
| Pin 10 | P4 — General-purpose I/O port 4 |
| Pin 11 | P5 — General-purpose I/O port 5 |
| Pin 12 | P6 — General-purpose I/O port 6 |
| Pin 13 | P7 — General-purpose I/O port 7 |
| Pin 14 | SCL — I2C serial clock |
| Pin 15 | SDA — I2C serial data |
| Pin 16 | VCC — Power supply |
Tipikal na mga Gamit
TCA9534DWT ay nararapat para sa 6 aplikasyons: Microcontroller Digital I/O Expansion, Relay and Solenoid Control, LED Status and Indicator Interface, Digital Sensor and Keypad Interface, Industrial Control Interface Expansion, Communications and Network Equipment Control.
Microcontroller Digital I/O Expansion
The TCA9534DWT is useful when a host controller needs additional digital lines for buttons, status indicators, or control signals without consuming its native pins. Its eight general-purpose ports are individually configurable through the I2C interface, while the 1.65 V to 5.5 V operating range accommodates common low-voltage systems. The device also supports 100 kHz Standard-mode and 400 kHz Fast-mode operation, allowing it to fit established embedded communication architectures. Keep the I2C routing compact and verify the port voltage limits against the connected logic family.
Inirekomenda
Relay and Solenoid Control
The TCA9534DWT can provide a compact bus-controlled interface for relays, solenoids, or other discrete loads that would otherwise consume several host-controller pins. Its eight outputs reduce wiring complexity while configuration registers allow each port direction to be managed independently. The interrupt output is useful for returning input status from the same board, although external driver circuitry remains necessary when a load exceeds the port's electrical capability. Confirm logic voltage, current, isolation, and inductive-load requirements before connecting it to power stages.
Inirekomenda
LED Status and Indicator Interface
The TCA9534DWT is well suited to centralized LED status indication because eight independently configurable ports can drive or sense multiple indicators through the host bus. Operating from 1.65 V to 5.5 V allows the device to share a low-voltage control domain with many embedded systems. Fast-mode operation up to 400 kHz supports responsive updates when indicators represent changing equipment status. Use suitable series-current limiting and account for simultaneous output loading so the selected indicator arrangement remains within the port specifications.
Inirekomenda
Digital Sensor and Keypad Interface
The TCA9534DWT can expand digital sensor inputs, switch states, or keypad contacts into a compact I2C-connected module. Configurable input ports and the interrupt output support event-driven polling behavior, helping a host avoid repeatedly reading the bus when no state has changed. The device's 8-bit width fits many binary control boards, and its 1.65 V to 5.5 V range supports low-voltage sensor systems. Use the datasheet to verify input thresholds, address setup, pull-up requirements, and the electrical characteristics of attached sensors.
Inirekomenda
Industrial Control Interface Expansion
The TCA9534DWT can extend a controller in industrial or instrumentation equipment that requires additional discrete control and status lines while retaining a compact serial interface. The I2C/SMBus connection reduces pin count and wiring compared with a parallel expansion port, while the interrupt line supports responsive detection of external state changes. Its 16-pin SOIC package is compatible with conventional surface-mount assembly and board-space constraints. Designers should still verify system voltage tolerance, isolation requirements, environmental limits, and the complete power budget before using it as an interface element.
Inirekomenda
Communications and Network Equipment Control
The TCA9534DWT is appropriate for communications equipment that needs discrete control, monitoring, or fault signaling in addition to its main communication interfaces. Eight configurable ports can handle status LEDs, module enables, or digital fault inputs, while the interrupt output provides an efficient change-notification path. Supporting both 100 kHz and 400 kHz I2C operation lets it operate with widely used embedded bus rates. Place the expander near the controlled circuitry, maintain short SCL and SDA routes, and confirm that bus pull-ups remain appropriate for the final loaded bus.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for TCA9534DWT — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | TCA9534DWR |
|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments |
| Package | SOIC-16 | SOIC-16 |
| I/O Port Count | 8 bits | 8 bits |
| I2C Standard-mode | 100 kHz | 100 kHz |
| I2C Fast-mode | 400 kHz | 400 kHz |
| Protocol | I2C and SMBus | I2C and SMBus |
| Interrupt Output | Yes | Yes |
| Configuration Registers | Yes | Yes |
| Ordering Suffix | TCA9534DWT | TCA9534DWR |
Pangunahing mga Pagkakaiba
- Eight configurable general-purpose ports in a compact interface IC (kumpara saTCA9534DWR)
- Supports both Standard-mode and Fast-mode I2C operation (kumpara saTCA9534DWR)
- Integrated interrupt and configuration registers (kumpara saTCA9534DWR)
Talaan ng Disenyo
Place the TCA9534DWT close to the connected input and output circuitry, and route SCL and SDA as short, continuous traces between the host controller and expander. Keep the address-input straps away from noisy switching nodes. The manufacturer datasheet should be used for decoupling requirements and the final pin assignment.
Do not assume that all eight ports can be used as outputs without checking the load current and voltage limits. Configure a port as an input before using it with an external signal source, and confirm the address pins are set to the intended I2C address. A wrong direction setting or address strap can make an otherwise functional board appear unresponsive.
Select I2C pull-up resistors for the actual bus voltage, capacitance, cable length, and operating speed. Keep pull-ups electrically close to the bus nodes and avoid long stub branches from SCL or SDA. When several expanders share the bus, review the combined pull-up resistance and the loading from every connected device before finalizing the schematic.
Impormasyon ng Pagsunod sa Kautusan
Compliance status was not explicitly stated in the referenced manufacturer and distributor information.