Overview
The PCA9535EDTR2G, produced by onsemi, is a 16-bit low-power I/O expander designed for use with the I2C bus and SMBus. This device provides general-purpose remote I/O expansion for most microcontroller families. It features two 8-bit configuration registers, input port registers, output port registers, and polarity inversion registers. At power-on, all I/Os default to inputs and can be configured as either inputs or outputs by the system master. The device is known for its low standby current consumption and compatibility with a wide range of operating voltages from 1.65 V to 5.5 V.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VDD Operating Range | 1.65 to 5.5 | V |
| Input / Output Pin Voltage | −0.5 to +7.0 | V |
| DC Supply Current (Standby) | 1 μA (Max) | μA |
| Low-Level Output Current | 8 to 42 mA (depending on VDD) | mA |
| I2C SCL Clock Frequencies | Standard Mode: 100 kHz, Fast Mode: 400 kHz, Fast Mode+: 1 MHz | kHz / MHz |
| ESD Performance | 3000 V Human Body Model, 400 V Machine Model | V |
| Storage Temperature Range | −65 to +150 °C | °C |
| Package Type | TSSOP-24 |
Key Features
- Low standby-current consumption of 1 μA Max
- I2C to Parallel port expander
- Open-drain active-low interrupt output
- 5-V Tolerant I/O ports
- Compatible with most microcontrollers
- 400-kHz Fast I2C Bus and 1 MHz Fast Mode+
- Polarity inversion register
- 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
- 64 Programmable Slave Addresses using Three Address Pins
- No Glitch on Power-up and Internal Power-on Reset
- Noise Filter on SCL/SDA Inputs
Applications
The PCA9535EDTR2G is suitable for a variety of applications, including:
- Remote I/O expansion for microcontrollers
- Automotive and industrial control systems
- Consumer electronics requiring low power consumption
- LED drivers and display systems
- Any system requiring additional I/O ports via the I2C interface
Q & A
- What is the operating voltage range of the PCA9535EDTR2G?
The PCA9535EDTR2G operates within a voltage range of 1.65 V to 5.5 V.
- How many I/O pins does the PCA9535EDTR2G provide?
The device provides 16 I/O pins, which default to inputs at power-on.
- What is the maximum I2C clock frequency supported by the PCA9535EDTR2G?
The device supports I2C clock frequencies up to 1 MHz in Fast Mode+.
- Does the PCA9535EDTR2G have built-in ESD protection?
- How are the I2C slave addresses configured on the PCA9535EDTR2G?
The I2C slave addresses are configured using three hardware address pins (AD0, AD1, AD2), allowing up to 64 devices to share the same I2C bus.
- What is the purpose of the polarity inversion register?
The polarity inversion register allows the polarity of the input port register to be inverted, enabling active-high or active-low operation.
- Does the PCA9535EDTR2G have an interrupt output?
- What is the standby current consumption of the PCA9535EDTR2G?
The standby current consumption is 1 μA maximum.
- Is the PCA9535EDTR2G compatible with automotive applications?
- What package types are available for the PCA9535EDTR2G?
The device is available in TSSOP-24, SOIC-24, and WQFN24 packages.
