Overview
The TCA9534, produced by Texas Instruments, is a 16-pin device designed to provide 8 bits of general purpose parallel input and output (I/O) expansion for the two-line bidirectional I2C bus (or SMBus) protocol. This device operates 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, offering flexibility in various applications.
The TCA9534 is particularly useful when additional I/Os are needed for devices such as switches, sensors, push-buttons, LEDs, fans, and other similar peripherals. It features an interrupt output that notifies the master when an input port changes state, enhancing system efficiency and responsiveness.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Power-Supply Voltage Range | 1.65 V to 5.5 V | V |
| Clock Frequency | 100 kHz (Standard-mode), 400 kHz (Fast-mode) | kHz |
| Package Type | TSSOP (16 pins), SOIC (16 pins) | - |
| Body Size (TSSOP) | 5.00 mm × 4.40 mm | mm |
| Body Size (SOIC) | 10.30 mm × 7.50 mm | mm |
| Operating Temperature Range | -40°C to 85°C | °C |
| ESD Protection | 2000-V Human-Body Model, 1000-V Charged-Device Model | V |
| Standby Current Consumption | Up to 3.9 µA (depending on VCC) | µA |
| Interrupt Output | Open-Drain Active-Low | - |
| Hardware Address Pins | Three (A0, A1, A2) | - |
Key Features
- ESD Protection Exceeds JESD 22: 2000-V Human-Body Model, 1000-V Charged-Device Model
- Low Standby Current Consumption
- I2C to Parallel Port Expander
- Open-Drain Active-Low Interrupt Output
- 5-V Tolerant I/O Ports
- 400-kHz Fast I2C Bus
- Three Hardware Address Pins Allow up to Eight Devices on the I2C/SMBus
- Input and Output Configuration Register
- Polarity Inversion Register
- Internal Power-On Reset
- Power-Up With All Channels Configured as Inputs
- No Glitch on Power Up
- Noise Filter on SCL/SDA Inputs
- Latched Outputs With High-Current Drive Maximum Capability for Directly Driving LEDs
- Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
Applications
- Servers
- Routers (Telecom Switching Equipment)
- Personal Computers
- Personal Electronics (e.g., Gaming Consoles)
- Industrial Automation
- Products With GPIO-Limited Processors
Q & A
- What is the operating voltage range of the TCA9534?
The TCA9534 operates with a power supply voltage ranging from 1.65 V to 5.5 V.
- What are the supported clock frequencies for the TCA9534?
The device supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock frequencies.
- What types of packages are available for the TCA9534?
The TCA9534 is available in TSSOP (16 pins) and SOIC (16 pins) packages.
- How many devices can be connected on the same I2C bus using the TCA9534?
Up to eight TCA9534 devices can be connected on the same I2C bus using the three hardware address pins (A0, A1, A2).
- What is the purpose of the interrupt output on the TCA9534?
The interrupt output is used to notify the master when an input port changes state.
- Does the TCA9534 have built-in ESD protection?
Yes, the TCA9534 has ESD protection that exceeds JESD 22 standards, including 2000-V Human-Body Model and 1000-V Charged-Device Model.
- What is the standby current consumption of the TCA9534?
The standby current consumption is up to 3.9 µA, depending on the VCC voltage.
- Can the TCA9534 drive LEDs directly?
Yes, the TCA9534 has latched outputs with high-current drive capability, allowing it to directly drive LEDs.
- What is the operating temperature range of the TCA9534?
The operating temperature range is from -40°C to 85°C.
- Does the TCA9534 have noise filtering on its inputs?
Yes, the TCA9534 has noise filters on its SCL/SDA inputs.
