Overview
The PCA9655EMTTXG is a remote 16-bit I/O expander designed by ON Semiconductor. This component provides 16 bits of general-purpose parallel input/output (GPIO) expansion through the I2C bus/SMBus interface. It consists of two 8-bit configuration registers, allowing each I/O to be configured as either an input or an output. The device features an open-drain interrupt output that signals the system master when any input state changes. The PCA9655EMTTXG is versatile, supporting a wide range of operating voltages from 1.65 V to 5.5 V, making it suitable for various applications in embedded systems and IoT devices.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VDD Operating Range | 1.65 to 5.5 | V |
| SDA Sink Capability | 30 | mA |
| I/O Pin Voltage | −0.5 to +7.0 | V |
| Input Current | −20 | mA |
| Output Current | −50 | mA |
| DC Supply Current | −100 | mA |
| Storage Temperature Range | −65 to +150 | °C |
| Junction Temperature Under Bias | 150 | °C |
| SCL Clock Frequencies | Standard Mode: 100 kHz, Fast Mode: 400 kHz, Fast Mode+: 1 MHz | |
| ESD Performance | 2000 V Human Body Model, 200 V Machine Model |
Key Features
- Voltage Range: Operates within a wide voltage range of 1.65 V to 5.5 V.
- I/O Configuration: Each I/O can be configured as either an input or an output.
- Polarity Inversion: Polarity inversion registers allow for the inversion of input port data.
- Interrupt Output: Open-drain interrupt output signals changes in input states.
- Low Standby Current: Low current consumption in standby mode.
- Noise Filter: Input filters on SCL/SDA inputs suppress noise spikes.
- No Glitch on Power-up: No glitches during power-up due to internal power-on reset.
- Programmable Slave Addresses: Up to 64 programmable slave addresses using three address pins.
- 5.5 V Tolerant I/Os: I/O pins are tolerant of up to 5.5 V.
Applications
The PCA9655EMTTXG is suitable for a variety of applications, including:
- Embedded Systems: Expanding GPIO capabilities in microcontrollers and other embedded systems.
- IoT Devices: Enhancing input/output capabilities in Internet of Things (IoT) devices.
- Industrial Automation: Used in industrial automation systems for expanded I/O needs.
- Consumer Electronics: Found in consumer electronics requiring additional I/O ports.
- Automotive Systems: Used in automotive systems for various control and monitoring functions.
Q & A
- What is the operating voltage range of the PCA9655EMTTXG?
The PCA9655EMTTXG operates within a voltage range of 1.65 V to 5.5 V.
- How many I/O pins does the PCA9655EMTTXG provide?
The PCA9655EMTTXG provides 16 bits of general-purpose parallel input/output (GPIO) expansion.
- What is the purpose of the interrupt output on the PCA9655EMTTXG?
The interrupt output signals the system master when any input state changes.
- Can the PCA9655EMTTXG be used in high-noise environments?
Yes, the PCA9655EMTTXG features input filters on SCL/SDA inputs to suppress noise spikes.
- How many programmable slave addresses does the PCA9655EMTTXG support?
The PCA9655EMTTXG supports up to 64 programmable slave addresses using three address pins.
- What is the maximum current sink capability of the SDA pin?
The SDA pin has a maximum current sink capability of 30 mA.
- What are the supported SCL clock frequencies for the PCA9655EMTTXG?
The PCA9655EMTTXG supports Standard Mode (100 kHz), Fast Mode (400 kHz), and Fast Mode+ (1 MHz) SCL clock frequencies.
- Is the PCA9655EMTTXG ESD protected?
Yes, the PCA9655EMTTXG has ESD protection with a Human Body Model rating of 2000 V and a Machine Model rating of 200 V.
- What is the typical standby current of the PCA9655EMTTXG?
The typical standby current is 1.1 μA when in standby mode with no load and fSCL = 0 Hz.
- How does the PCA9655EMTTXG handle power-on reset?
The PCA9655EMTTXG features an internal power-on reset that initializes the device state machine and sets all I/Os to their default states upon power-up.
