Overview
The TCA9535, produced by Texas Instruments, is a 16-bit I2C/SMBus I/O expander designed to provide general-purpose parallel input and output expansion for systems using the two-line bidirectional I2C bus or SMBus protocol. This device is particularly useful in scenarios where additional I/O ports are needed, such as in systems with GPIO-limited processors. The TCA9535 operates over a wide power supply voltage range of 1.65 V to 5.5 V, making it versatile for various applications.
Key Specifications
| Parameter | Value |
|---|---|
| Number of I/O Bits | 16 |
| Power Supply Voltage Range | 1.65 V to 5.5 V |
| I2C Bus Speed | 400 kHz |
| Package Types | TSSOP (24), SSOP (24), WQFN (24), VQFN (24) |
| Package Dimensions | TSSOP: 7.80 mm x 4.40 mm, SSOP: 6.20 mm x 5.30 mm, WQFN/VQFN: 4.00 mm x 4.00 mm |
| Interrupt Output | Open-drain active-low |
| I/O Port Tolerance | 5-V tolerant |
| ESD Protection | 2000-V Human-Body Model, 1000-V Charged-Device Model |
| Latch-up Performance | Exceeds 100 mA per JESD 78, class II |
Key Features
- I2C to Parallel port expander
- Wide power supply voltage range of 1.65 V to 5.5 V
- Low standby-current consumption
- Open-drain active-low interrupt output
- 5-V tolerant I/O ports
- 400-kHz Fast I2C bus
- Polarity inversion register
- Address by three hardware address pins for use of up to eight devices
- Latched outputs with high-current drive capability for directly driving LEDs
- ESD protection exceeds JESD 22 standards
Applications
- Consumer electronics
- Industrial automation
- Products with GPIO-limited processors
- Consoles and gaming systems
- Any system requiring additional I/O expansion
Q & A
- What is the TCA9535? The TCA9535 is a 16-bit I2C/SMBus I/O expander providing general-purpose parallel input and output expansion.
- What is the power supply voltage range of the TCA9535? The TCA9535 operates over a power supply voltage range of 1.65 V to 5.5 V.
- What is the speed of the I2C bus supported by the TCA9535? The TCA9535 supports a 400-kHz Fast I2C bus.
- What types of packages are available for the TCA9535? The TCA9535 is available in TSSOP, SSOP, WQFN, and VQFN packages.
- Does the TCA9535 have internal pull-up resistors? No, the TCA9535 does not include internal I/O pull-up resistors, requiring external pull-ups and pull-downs on unused I/O pins when configured as inputs.
- What is the interrupt output type of the TCA9535? The TCA9535 has an open-drain active-low interrupt output.
- What is the ESD protection level of the TCA9535? The TCA9535 has ESD protection exceeding 2000-V Human-Body Model and 1000-V Charged-Device Model.
- Can the TCA9535 drive LEDs directly? Yes, the TCA9535 has latched outputs with high-current drive capability for directly driving LEDs.
- How many devices can be addressed using the TCA9535? Up to eight devices can be addressed using the three hardware address pins.
- What are some common applications of the TCA9535? Common applications include consumer electronics, industrial automation, and products with GPIO-limited processors.
