Overview
The TCA9535DBR, 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 24-pin device operates over a wide power supply voltage range of 1.65 V to 5.5 V, making it versatile for various applications. At power-on, the I/Os are configured as inputs, and the system controller can configure them as either inputs or outputs by writing to the I/O configuration bits. The device is part of the TCA9535 series, which is identical to the TCA9555 except for the absence of internal I/O pull-up resistors, requiring external pull-ups and pull-downs on unused I/O pins when configured as inputs and undriven.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of I/Os | 16 | - |
| Power Supply Voltage Range | 1.65 V to 5.5 V | V |
| I2C Bus Frequency | 400 kHz | kHz |
| Operating Temperature Range | -40°C to 85°C | °C |
| Package Type | SSOP (24 pins) | - |
| ESD Protection | 2000-V Human-Body Model, 1000-V Charged-Device Model | V |
| Latch-up Performance | Exceeds 100 mA per JESD 78, class II | mA |
| Interrupt Output | Open-drain active-low | - |
| I/O Port Tolerance | 5-V tolerant | V |
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
The TCA9535DBR is suitable for a variety of applications, including:
- Consumer electronics
- Industrial automation
- Products with GPIO-limited processors
- Any system requiring I/O expansion via the I2C or SMBus protocol
Q & A
- What is the TCA9535DBR?
The TCA9535DBR is a 16-bit I2C/SMBus I/O expander produced by Texas Instruments.
- What is the power supply voltage range of the TCA9535DBR?
The device operates over a power supply voltage range of 1.65 V to 5.5 V.
- What is the maximum frequency of the I2C bus for the TCA9535DBR?
The I2C bus frequency can go up to 400 kHz.
- What type of interrupt output does the TCA9535DBR have?
The device features an open-drain active-low interrupt output.
- Is the TCA9535DBR ESD protected?
Yes, it exceeds JESD 22 standards with 2000-V Human-Body Model and 1000-V Charged-Device Model protection.
- How many devices can be addressed using the TCA9535DBR?
Up to eight devices can be addressed using three hardware address pins.
- What is the operating temperature range of the TCA9535DBR?
The operating temperature range is -40°C to 85°C.
- What is the difference between the TCA9535 and TCA9555?
The TCA9535 does not include internal I/O pull-up resistors, unlike the TCA9555.
- Can the TCA9535DBR drive LEDs directly?
Yes, it has latched outputs with high-current drive capability for directly driving LEDs.
- What package types are available for the TCA9535DBR?
The device is available in SSOP (24 pins) among other package types.
