TCA9534PWR - 8-Bit I/O Expander | Texas Instruments
Référence : TCA9534PWR ✓ ActifTCA9534PWR Présentation
An I/O expander is an interface IC that extends the number of digital input and output lines available to a host processor over a serial bus. The I2C interface connects the expander to a controller, while the eight parallel ports connect to switches, sensors, LEDs, relays, or other digital peripherals. In the system hierarchy, the TCA9534 is an interface IC and a GPIO expander built around an I2C-compatible serial interface.
The TCA9534 includes three hardware address inputs, allowing up to eight devices to share one I2C bus. It also includes an interrupt output, configuration registers, and a power-on reset function that restores the device to its default state. The 1.65 V minimum supply voltage supports low-voltage embedded systems, while the 5.5 V maximum supports conventional 5 V peripherals and logic.
The TCA9534PWR is suitable for industrial control boards, sensor interfaces, panel controls, LED indicators, configuration connectors, and compact embedded platforms. Its low-voltage operation and 400 kHz I2C speed make it useful when the host controller requires more GPIO resources without adding a high-speed switching regulator or a large package. The interrupt output allows the controller to service external state changes without continuous polling.
Designers should place the device close to the I/O connector or controlled peripherals and route the I2C lines away from noisy switching nodes. Pull-up resistors must be selected for the actual bus voltage and capacitance. The three address pins should be configured before enabling the bus, and software must account for the TCA9534 register map and power-on reset behavior. The manufacturer datasheet should be used for the complete pin assignment and electrical limits.
This page provides practical application guidance, parameter comparisons, drop-in replacement information, and design notes that support faster component selection and PCB implementation.
Alternatives de remplacement direct pour TCA9534PWR — 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 TCA9534PWR (même facteur de forme et même empreinte) — différant par Package, Device Type, Supply Voltage Range.
TCA9534APWR
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
TCA9534PWR-Q1
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
PCA9534PWR
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →PCA9534APWR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
PCA9535PWR
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →TCA9534PWR Spécifications
| Number of I/O | 8 bidirectional I/O |
| Type d'interface | I2C and SMBus |
| Supply Voltage Range | 1.65 V to 5.5 V |
| Maximum I2C Clock Frequency | 400 kHz |
| Address Inputs | 3 hardware address inputs |
| Maximum Devices on Bus | 8 devices |
| Interrupt Output | Yes |
| Configuration Registers | Yes |
| Power-On Reset | Yes, power-on reset restores default state |
| I/O Port Direction | 8 independently configurable ports |
| Boîtier | 16-pin TSSOP (PW) |
| Type de montage | Surface mount |
| Type de sortie | Open-drain interrupt output |
| Low-Power Operation | Low-power I/O expander |
| Datasheet Revision | Rev. D |
Configuration des broches de TCA9534PWR
| Broche 1 | A0 — Address input A0 |
| Broche 2 | A1 — Address input A1 |
| Broche 3 | A2 — Address input A2 |
| Broche 4 | P0 — Port 0 input/output |
| Broche 5 | P1 — Port 1 input/output |
| Broche 6 | P2 — Port 2 input/output |
| Broche 7 | P3 — Port 3 input/output |
| Broche 8 | VSS — Ground |
| Broche 9 | P4 — Port 4 input/output |
| Broche 10 | P5 — Port 5 input/output |
| Broche 11 | P6 — Port 6 input/output |
| Broche 12 | P7 — Port 7 input/output |
| Broche 13 | INT — Interrupt output |
| Broche 14 | SCL — Serial clock input |
| Broche 15 | SDA — Serial data input/output |
| Broche 16 | VDD — Positive supply voltage |
Applications typiques
TCA9534PWR convient pour 6 applications: Industrial Sensor and Control Interface, LED Status and Keypad Control, Embedded System GPIO Expansion, Battery-Powered Instrumentation, Communication and Network Equipment, Test and Measurement Control Panel.
Industrial Sensor and Control Interface
The TCA9534PWR is well suited to industrial control boards that need to connect limit switches, discrete sensors, relay-control signals, and status indicators to a microcontroller over I2C. Its eight bidirectional ports reduce pressure on the host GPIO, while the 1.65 V to 5.5 V supply range accommodates both low-voltage sensor logic and 5 V control logic when each peripheral is compatible. The interrupt output lets the controller react to a changed input without continuously polling the expander. In a typical design, the I2C pins connect to the controller bus, pull-ups are placed according to bus voltage and capacitance, and the eight port pins route to a connector or control area.
Recommandé
LED Status and Keypad Control
TCA9534PWR can expand a compact control panel with LED indicators, pushbuttons, and status lamps. The eight ports can be split between outputs for LEDs and inputs for switches through the configuration registers, allowing one serial bus to serve both functions. The 400 kHz maximum I2C clock supports practical update rates for visual indicators and human-interface polling, while the interrupt output can notify the controller when a switch changes state. Because the TCA9534PWR operates from 1.65 V to 5.5 V, it can fit low-voltage logic systems when the LED current-limiting and polarity arrangement are designed for the selected rail.
Recommandé
Embedded System GPIO Expansion
TCA9534PWR gives embedded processors additional GPIO without requiring a larger host package or a more complex serial interface. The 16-pin TSSOP package is useful in compact modules where board area is constrained, and the I2C interface allows the expander to share communication pins with sensors, EEPROM, or other peripherals. The three address inputs allow multiple expanders to coexist on one bus. Firmware should configure each port as input or output after reset, account for the default state, and use the interrupt register in a way that prevents repeated notifications from an unresolved source.
Recommandé
Battery-Powered Instrumentation
The TCA9534PWR is appropriate for portable measurement equipment that needs additional control and monitoring lines but has limited I/O availability. Its low-voltage operation starts at 1.65 V, allowing the device to operate alongside low-energy system rails, and its low-power I/O-expander design helps avoid unnecessary controller polling when the interrupt output is used. The device can monitor enable signals, battery-related status inputs, and isolated control lines while the host manages measurement sequencing. The power budget should still include the expander's operating and standby currents as well as pull-up network consumption across the complete bus voltage range.
Recommandé
Communication and Network Equipment
TCA9534PWR can provide auxiliary control and status I/O in communication equipment, network appliances, and modular control cards. The I2C bus provides a compact connection between the expander and a host processor, while the interrupt output allows the host to respond to external events. Eight configurable ports are useful for module-present indicators, reset controls, alarm inputs, or peripheral enables. In a multi-board system, the three address inputs allow several TCA9534 devices to share a common bus, but address straps, pull-ups, and interrupt sharing must be planned carefully to prevent contention and address conflicts.
Recommandé
Test and Measurement Control Panel
The TCA9534PWR is useful in test and measurement systems that need front-panel control signals without loading the primary controller. It can operate mux-select inputs, range-control lines, relay enables, and status LEDs over I2C while the host communicates with the measurement engine. The interrupt output supports prompt handling of panel events such as a limit switch or service request. Because the TCA9534PWR supports a 1.65 V minimum supply, it can fit modern mixed-voltage test equipment, provided the selected port pins remain within the applicable voltage limits and any externally connected signals have suitable protection.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour TCA9534PWR — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | TCA9534APWR | TCA9534PWR-Q1 | PCA9534PWR | PCA9534APWR | PCA9535PWR |
|---|---|---|---|---|---|---|
| Package | 16-pin TSSOP (PW) | 16-pin TSSOP (PW) | 16-pin TSSOP (PW) | 16-pin TSSOP (PW) | 16-pin TSSOP (PW) | 16-pin TSSOP (PW) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Number of I/O | 8 bidirectional I/O | 8 bidirectional I/O | 8 bidirectional I/O | 8 bidirectional I/O | 8 bidirectional I/O | 8 bidirectional I/O |
Principaux différenciateurs
- Lower minimum operating voltage (vs PCA9534PWR)
- Automotive-qualified family option (vs TCA9534APWR)
- Improved power-on reset behavior (vs TCA9534PWR)
Notes de conception
Confirm that the I2C pull-up network is tied to the actual bus voltage rather than automatically to VDD of the TCA9534. Calculate the maximum current through each pull-up during SDA or SCL assertions and verify that the controller, expander, and every connected device can sink it. This is especially important in mixed 1.8 V and 5 V systems, where an incorrectly chosen pull-up rail can violate input limits or prevent valid low-level signaling.
Place the TCA9534PWR close to the connector or peripheral group served by its eight port pins, while keeping the SDA and SCL traces short and away from switching nodes. Use the pin-description table in the manufacturer datasheet when assigning tracks, and provide a stable ground return. Address straps for A0, A1, and A2 should be placed where they can be tested or configured reliably, with the final logic level established before the bus starts.
Do not assume that all similarly named PCA and TCA devices have identical reset, address, or interrupt behavior. The TI comparison material states that TCA devices are pin-to-pin compatible with PCA counterparts, but it also identifies supply-range, power-on-reset, and interrupt differences. Revalidate firmware register access, fixed addresses, and interrupt clearing after any substitution, especially when the system relies on a 1.8 V rail or a shared interrupt line.
Informations de conformité
The verified manufacturer and distributor information does not explicitly state the required compliance results. Do not assume RoHS, REACH, lead-free, halogen-free, or conflict-minerals status from the product category alone.