Overview
The TCA9536DGKR, produced by Texas Instruments, is a remote 4-bit I²C and SMBus I/O expander designed for a wide range of applications. This device operates within a power-supply voltage range of 1.65 V to 5.5 V, making it versatile for various microcontroller families. It provides general-purpose remote I/O expansion via the I²C interface, allowing system controllers to configure the I/Os as either inputs or outputs. The TCA9536 features software reset via I²C general call, software-enabled integrated pull-up resistors, and an open-drain interrupt output. It is particularly useful in scenarios where additional I/O ports are needed without adding complexity to the main microcontroller.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 1.65 | - | 5.5 | V |
| Input Voltage | -0.5 | - | 6 | V |
| Output Voltage | -0.5 | - | 6 | V |
| Continuous Output Low Current (VCC > 1.8 V) | - | - | 25 | mA |
| Continuous Output High Current (VCC > 1.8 V) | - | - | -10 | mA |
| Junction Temperature | - | - | 125 | °C |
| Storage Temperature | -65 | - | 150 | °C |
| I²C Bus Frequency | - | - | 1 MHz | - |
Key Features
- I²C to GPIO expander
- Operating power-supply voltage range of 1.65 V to 5.5 V
- 5-V tolerant I/O ports
- Software reset via I²C general call
- Software-enabled integrated pull-up resistors on P ports
- P3 can be repurposed as INT output
- 1-MHz Fast mode plus I²C bus
- Input and output configuration register
- Polarity inversion register
- Internal power-on reset
- Power-up with all channels configured as inputs
- Noise filter on SCL and SDA inputs
- Latched outputs with high-current drive capability for directly driving LEDs
- ESD protection exceeds JESD 22 – 2000-V Human-body model and 1000-V Charged-device model
Applications
- Personal electronics: wearables, mobile phones, gaming consoles
- Servers
- Routers
Q & A
- What is the operating voltage range of the TCA9536?
The TCA9536 operates within a power-supply voltage range of 1.65 V to 5.5 V.
- What is the maximum I²C bus frequency supported by the TCA9536?
The TCA9536 supports up to 1 MHz Fast mode plus I²C bus.
- Can the TCA9536 be reset via software?
- What is the function of the P3 pin in the TCA9536?
The P3 pin can be configured as either an I/O port or an interrupt (INT) output.
- Does the TCA9536 have built-in pull-up resistors?
- What type of ESD protection does the TCA9536 offer?
The TCA9536 offers ESD protection that exceeds JESD 22 – 2000-V Human-body model and 1000-V Charged-device model).
- Can the TCA9536 drive LEDs directly?
- What is the typical junction-to-ambient thermal resistance for the VSSOP package?
The typical junction-to-ambient thermal resistance for the VSSOP package is 183.7 °C/W).
- How are the I/O ports configured at power-on?
- Can the polarity of the Input Port register be inverted?
