Overview
The PCA9655EDTR2G, produced by onsemi, is a remote 16-bit I/O expander designed for use with the I2C bus and SMBus. This device provides 16 bits of general-purpose parallel input/output (GPIO) expansion, making it highly versatile for various applications. The PCA9655E consists of two 8-bit configuration registers, allowing each I/O to be configured as either an input or an output. At power-on, all I/Os default to inputs. The device also features an open-drain interrupt output that is activated when any input state differs from its corresponding input port register state, indicating changes to the system master.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VDD Operating Range | 1.65 to 5.5 | V |
| SDA Sink Capability | 30 | mA |
| I/O Voltage Tolerance | Up to 5.5 V | V |
| I2C SCL Clock Frequencies | Standard Mode: 100 kHz, Fast Mode: 400 kHz, Fast Mode+: 1 MHz | Hz |
| ESD Performance | 2000 V Human Body Model, 200 V Machine Model | V |
| Maximum Ratings - DC Supply Voltage | -0.5 to +7.0 | V |
| Maximum Ratings - Input/Output Pin Voltage | -0.5 to +7.0 | V |
| Maximum Ratings - DC Supply Current | -100 to +100 | mA |
| Storage Temperature Range | -65 to +150 | °C |
| Junction Temperature Under Bias | 150 | °C |
| Thermal Resistance (SOIC-24) | 85 | °C/W |
Key Features
- VDD Operating Range: 1.65 V to 5.5 V
- SDA Sink Capability: 30 mA
- 5.5 V Tolerant I/Os: Inputs and outputs can tolerate up to 5.5 V
- Polarity Inversion Register: Allows inversion of the polarity of the read register
- Active LOW Interrupt Output: Indicates changes in input states to the system master
- Low Standby Current: Reduced power consumption in standby mode
- Noise Filter on SCL/SDA Inputs: Suppresses noise spikes less than 50 ns
- No Glitch on Power-up: Ensures stable operation during power-up
- Internal Power-on Reset: Initializes device state machine and registers upon power-on
- 64 Programmable Slave Addresses: Using three address pins (AD0, AD1, AD2)
- 16 I/O Pins: Default to inputs at reset
Applications
The PCA9655EDTR2G is suitable for a wide range of applications, including:
- Industrial Automation: For expanding I/O capabilities in control systems.
- Consumer Electronics: In devices requiring multiple I/O interfaces, such as smart home devices.
- Medical Devices: For adding I/O functionality in medical equipment.
- Automotive Systems: To enhance I/O capabilities in automotive control units.
- Embedded Systems: For microcontrollers and other embedded systems needing I/O expansion.
Q & A
- What is the operating voltage range of the PCA9655EDTR2G?
The PCA9655EDTR2G operates within a voltage range of 1.65 V to 5.5 V.
- How many I/O pins does the PCA9655EDTR2G have?
The device has 16 I/O pins, which default to inputs at reset.
- What is the purpose of the interrupt output on the PCA9655EDTR2G?
The interrupt output is used to indicate to the system master that an input state has changed.
- How many programmable slave addresses are available for the PCA9655EDTR2G?
Up to 64 programmable slave addresses are available using three address pins (AD0, AD1, AD2).
- What are the supported I2C clock frequencies for the PCA9655EDTR2G?
The device supports Standard Mode (100 kHz), Fast Mode (400 kHz), and Fast Mode+ (1 MHz).
- Does the PCA9655EDTR2G have built-in noise filtering?
Yes, the device includes noise filters on the SCL and SDA inputs to suppress noise spikes less than 50 ns.
- How does the PCA9655EDTR2G handle power-on reset?
The device has an internal power-on reset that initializes the device state machine and registers upon power-on.
- What is the thermal resistance of the SOIC-24 package for the PCA9655EDTR2G?
The thermal resistance for the SOIC-24 package is 85 °C/W.
- Is the PCA9655EDTR2G ESD protected?
Yes, the device has ESD protection with a rating of 2000 V Human Body Model and 200 V Machine Model.
- Can the PCA9655EDTR2G be used in high-temperature environments?
The device can operate in temperatures ranging from -55°C to +125°C.
