Overview
The TCA9534DWR, produced by Texas Instruments, is a 16-pin device that provides 8 bits of general-purpose parallel input and output (I/O) expansion for the two-line bidirectional I2C bus (or SMBus) protocol. This device is designed to operate with a power supply voltage ranging from 1.65 V to 5.5 V, making it versatile for use with a wide range of devices. It supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock frequencies, enhancing its applicability in various systems.
The TCA9534DWR is particularly useful when additional I/Os are needed for components such as switches, sensors, push-buttons, LEDs, fans, and other similar devices. It features an interrupt output on the INT pin, which notifies the master when an input port changes state. The device also includes three hardware selectable address pins (A0, A1, A2), allowing up to eight TCA9534 devices to be connected on the same I2C/SMBus.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Operating Power-Supply Voltage Range | 1.65 V to 5.5 V | 1.65 V to 5.5 V |
| I2C Bus Speed | Standard-mode (100 kHz), Fast-mode (400 kHz) | 100 kHz, 400 kHz |
| ESD Protection | 2000-V Human-Body Model (A114-A), 1000-V Charged-Device Model (C101) | 2000 V, 1000 V |
| Standby Current Consumption | Low standby current | 1.5 µA to 3.9 µA (depending on VCC) |
| Output Current Capability | High-current drive for directly driving LEDs | Up to 25 mA per I/O pin |
| Package Type | TSSOP (16 pins), SOIC (16 pins) | TSSOP, SOIC |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C |
Key Features
- I2C to Parallel Port Expander: Expands the I2C bus to provide additional I/O ports.
- Open-Drain Active-Low Interrupt Output: Generates an interrupt on the INT pin when an input port changes state.
- 5-V Tolerant I/O Ports: Compatible with 5V logic levels.
- Three Hardware Address Pins: Allows up to eight devices on the same I2C/SMBus.
- Input and Output Configuration Register: Configures the I/O ports as inputs or outputs.
- Polarity Inversion Register: Inverts the polarity of the I/O ports.
- Internal Power-On Reset: Resets the device to its default state on power-up.
- No Glitch on Power Up: Ensures no output glitches during power-up.
- Noise Filter on SCL/SDA Inputs: Reduces noise on the I2C bus.
- Latched Outputs With High-Current Drive: Capable of directly driving LEDs.
Applications
- Servers and Routers (Telecom Switching Equipment): For expanding I/O capabilities in server and router systems.
- Personal Computers: Enhances I/O functionality in personal computer systems.
- Personal Electronics (e.g., Gaming Consoles): Suitable for use in various personal electronic devices.
- Industrial Automation: Used in industrial automation systems to expand I/O capabilities.
- Products With GPIO-Limited Processors: Ideal for devices with limited GPIO ports on the processor.
Q & A
- What is the operating voltage range of the TCA9534DWR?
The operating voltage range is from 1.65 V to 5.5 V.
- What are the supported I2C bus speeds for the TCA9534DWR?
The device supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock frequencies.
- How many devices can be connected on the same I2C/SMBus using the TCA9534DWR?
Up to eight devices can be connected using the three hardware selectable address pins (A0, A1, A2).
- What is the purpose of the interrupt output on the INT pin?
The interrupt output notifies the master when an input port changes state.
- Does the TCA9534DWR have built-in ESD protection?
Yes, it exceeds JESD 22 standards with 2000-V Human-Body Model (A114-A) and 1000-V Charged-Device Model (C101) protection.
- What is the standby current consumption of the TCA9534DWR?
The standby current consumption is low, ranging from 1.5 µA to 3.9 µA depending on the VCC voltage.
- Can the TCA9534DWR directly drive LEDs?
Yes, it has latched outputs with high-current drive capability for directly driving LEDs.
- What are the package types available for the TCA9534DWR?
The device is available in TSSOP (16 pins) and SOIC (16 pins) packages.
- What is the operating temperature range of the TCA9534DWR?
The operating temperature range is from -40°C to 85°C.
- Does the TCA9534DWR have noise filtering on the I2C bus?
Yes, it includes noise filters on the SCL/SDA inputs to reduce noise on the I2C bus.
