TCA1116PWR - 16-Bit I2C I/O Expander | Texas Instruments
Référence : TCA1116PWR ✓ ActifTCA1116PWR Présentation
An I/O expander is an interface IC that translates serial I2C commands into parallel digital signals. It sits between a microcontroller or other host controller and external switches, sensors, indicators, or logic inputs. The TCA1116PWR belongs to the I/O expander category, the interface IC category, and the broader semiconductor hierarchy. Its purpose is to reduce the number of GPIO pins required by embedded systems while allowing the added ports to be addressed through the I2C bus.
Key features include 16 independently usable I/O ports, 400 kHz serial-bus operation, an active-low open-drain interrupt output, and an active-low reset input. The I/O pins tolerate 5 V signals, while the SDA and SCL inputs remain 5 V tolerant during partial power-down with less than 1 uA of leakage even when VCC is zero. These features allow mixed-voltage interfaces and controlled shutdown behavior in compact embedded systems.
The TCA1116PWR is designed for systems in which a host needs more parallel lines than its controller provides. Two programming interfaces can address the expander, and its address inputs support placing multiple devices on one bus. The interrupt output allows the controller to avoid continuous polling when a connected peripheral changes state. Reset provides a defined startup state for the ports and helps simplify firmware initialization across a multi-device system.
Typical uses include industrial control modules, building-automation interfaces, sensor aggregators, programmable logic controllers, LED and relay monitoring, test equipment, and embedded human-machine interfaces. In a sensor aggregation circuit, the host can configure input ports, read multiple digital signals, and use the interrupt line to request service only when a monitored event occurs. The TCA1116PWR is particularly useful where board area and host-controller pin count are constrained.
When laying out the circuit, connect pull-up resistors to the appropriate I2C supply and keep SDA, SCL, and interrupt traces away from noisy switching nodes. Confirm the device address configuration and reset state in firmware, and account for the open-drain nature of the interrupt output when selecting its pull-up network.
This page consolidates the device function, interface limits, package details, practical design guidance, and qualified drop-in comparison information to support faster component selection and PCB implementation.
Alternatives de remplacement direct pour TCA1116PWR — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec TCA1116PWR (même facteur de forme et même empreinte) — différant par Package.
PCA9535PWR
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →TCA1116PWR Spécifications
| Product Type | 16-bit I2C/SMBus I/O expander |
| Number of I/O Ports | 16 ports |
| Supply Voltage Range | 1.65 V to 5.5 V |
| Maximum I2C Clock Frequency | 400 kHz |
| Low-Voltage I2C Operation | 1.8 V I2C operation |
| I/O Port Logic Voltage Tolerance | 5 V tolerant |
| SDA and SCL Voltage Tolerance | 5 V tolerant |
| Partial Power-Down Leakage | Less than 1 uA |
| Interrupt Output Type | Open-drain, active-low |
| Reset Input | Active-low |
| Boîtier | 24-pin TSSOP (PW) |
| Type de montage | Surface mount |
| Maximum I2C Bus Frequency | 400 kHz |
| Statut RoHS | Compliant |
| Lead-Free Status | Lead-free |
Guide de configuration des broches du TCA1116PWR 24-pin tssop (pw)
Configuration des broches du TCA1116PWR (boîtier 24-pin tssop (pw)). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour TCA1116PWR.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
TCA1116PWR convient pour 6 applications: Industrial Digital I/O Expansion, Sensor Aggregation Node, Programmable Logic Controller Interface, Building Automation Interface, LED and Relay Control Panel, Embedded Test and Measurement Interface.
Industrial Digital I/O Expansion
The TCA1116PWR fits industrial control modules that need more digital inputs and outputs than the host controller provides directly. Its 16 parallel ports can monitor discrete sensors, limit switches, and machine-state signals while driving indicators or control inputs. Running the serial interface at up to 400 kHz permits grouped updates, and the active-low interrupt allows the controller to respond to a changed input without continuously polling all 16 lines. The 24-pin TSSOP package also keeps the expansion stage compact on a crowded control board.
Recommandé
Sensor Aggregation Node
The TCA1116PWR is useful in a sensor aggregation node where multiple digital sensors share a compact interface with a microcontroller. Up to 16 ports can report presence, alarm, threshold, and enable signals, while the interrupt output provides an event-driven path into the host. The 1.65 V to 5.5 V operating range supports low-voltage logic, and 5 V-tolerant I/O allows controlled integration with higher-voltage sensor interfaces. Firmware should configure each line's direction and establish a deterministic reset state before accepting measurements.
Recommandé
Programmable Logic Controller Interface
A PLC interface can use the TCA1116PWR to connect field-level digital signals to a compact embedded controller. The 16 ports can represent inputs such as interlocks and mode selectors, with remaining lines assigned to outputs for relays or status lamps. The 400 kHz I2C rate supports efficient register access, while the interrupt output reduces processor activity when a field input changes. Because the interrupt is open-drain and active-low, its pull-up arrangement must match the system voltage and ensure a valid logic-high when no interrupt is asserted.
Recommandé
Building Automation Interface
The TCA1116PWR can bridge low-voltage digital building-automation inputs to a controller without consuming a comparable number of MCU GPIO pins. Its ports can monitor door contacts, occupancy indicators, alarms, and equipment states, or drive enable inputs on downstream interface blocks. The wide 1.65 V to 5.5 V supply range and 5 V-tolerant ports support mixed-voltage logic partitioning, while the interrupt output allows the controller to handle changes efficiently. Deployment in a building controller still requires review of isolation, surge exposure, and environmental limits.
Recommandé
LED and Relay Control Panel
The TCA1116PWR can provide a compact parallel control layer for LED indicators, relay drivers, and status lamps in an equipment panel. Sixteen output-capable ports reduce direct host-controller pin demand, and the bus interface permits centralized configuration and diagnostics. Input-capable lines can also read switch or feedback positions when the electrical design permits the same pins to change direction. Designers should account for output-current limits, relay-driver transients, and the common ground reference, while keeping sensitive serial and interrupt traces away from switching nodes.
Recommandé
Embedded Test and Measurement Interface
The TCA1116PWR is appropriate for test fixtures and embedded measurement systems that need a larger bank of digital control and status lines. A host can use the 16 ports to enable test modes, select measurement paths, read fixture sensors, and monitor completion signals. Fast-mode I2C operation up to 400 kHz supports practical register-update rates, while reset provides a repeatable initialization state. The design should define safe states for every output before reset release and use suitable isolation or protection where fixture wiring leaves the equipment enclosure.
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Récapitulatif des produits recommandés
Données de référence d'ingénierie pour TCA1116PWR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | PCA9535PWR |
|---|---|---|
| Brand | Texas Instruments | Texas Instruments |
| Package | 24-pin TSSOP (PW) | 24-pin TSSOP (PW) |
| Number of I/O Ports | 16 ports | 16 ports |
| Product Type | I2C and SMBus parallel I/O expander | I2C parallel I/O expander |
Principaux différenciateurs
- Provides a combined 16-port expansion with event notification (vs PCA9535PWR)
- Supports mixed-voltage interfaces (vs PCA9535PWR)
- Maintains serial-bus operation during partial power-down (vs PCA9535PWR)
Notes de conception
Place the I2C pull-up resistors close to the bus master or the physically farthest active device, depending on bus topology. Keep SDA and SCL traces short, route them away from switching inductors and relay nodes, and provide continuous ground references. The TCA1116PWR supports 400 kHz operation, so longer branches and excessive bus capacitance require more careful topology and impedance control than a low-speed short bus.
Do not assume that equal port counts guarantee interchangeable behavior. Before replacing the TCA1116PWR with the PCA9535PWR, compare the address-input levels, reset polarity, interrupt polarity, port-direction defaults, and partial-power-down state. Program a deterministic input, output, and pull configuration after reset, and verify every board-level net against both devices' pin-description tables.
Treat the open-drain interrupt output as a shared, active-low signaling resource. Select a pull-up voltage compatible with the host domain and confirm that no other device forces the line low during normal operation. Place the pull-up near the interrupt consumer or expander according to the board's bus topology, and keep the trace away from high-current switching paths to prevent false interrupt events.
Decouple the VCC pin locally with the capacitance and placement specified by the Texas Instruments TCA1116 datasheet. Account for the expander's supply current, bus pull-ups, and any port loads when sizing the regulator. Because SDA and SCL remain 5 V tolerant during partial power-down, their pull-ups and connected devices must not back-power unintended circuitry when VCC is zero.
Informations de conformité
The manufacturer-related component listing identifies TCA1116PWR as RoHS compliant and lead-free. No additional compliance conclusion is inferred.