PCA9535DWR
Product Overview
Category: Integrated Circuit (IC)
Use: The PCA9535DWR is a 16-bit I2C-bus and SMBus I/O expander optimized for dimming LEDs in applications such as backlight control, keypad illumination, and general-purpose output expansion. It provides 16 open-drain, active-low outputs that can be controlled through the I2C bus.
Characteristics: - 16-bit I/O expander - I2C-bus and SMBus compatible - Open-drain, active-low outputs - Internal power-on reset - Noise filter on SCL/SDA inputs - Low standby current consumption - 400 kHz Fast-mode I2C-bus interface
Package: SO20 Wide package
Essence: The PCA9535DWR is an essential component for controlling LED brightness and expanding the number of available output pins in various electronic devices.
Packaging/Quantity: The PCA9535DWR is typically sold in reels of 2500 units per reel.
Specifications
- Supply Voltage: 2.3 V to 5.5 V
- Input Voltage Range: GND to VDD
- Output Voltage Range: GND to VDD
- Operating Temperature Range: -40°C to +85°C
- I2C-bus Frequency: 100 kHz or 400 kHz
- Standby Current Consumption: 1 µA (typical)
- Output Current: 25 mA (maximum)
Detailed Pin Configuration
The PCA9535DWR has a total of 20 pins arranged as follows:
___________
| |
1 | 20 | VDD
2 | 19 | P0
3 | 18 | P1
4 | 17 | P2
5 | 16 | P3
6 | 15 | P4
7 | 14 | P5
8 | 13 | P6
9 | 12 | P7
10 | 11 | GND
|___________|
Functional Features
- Individual LED brightness control
- Expandable output pins for general-purpose use
- Simple I2C-bus interface for easy integration
- Power-on reset ensures predictable startup behavior
- Noise filter minimizes interference on the I2C bus
- Low standby current consumption for energy efficiency
Advantages and Disadvantages
Advantages: - Versatile I/O expander for LED dimming and output expansion - Compatible with popular I2C-bus and SMBus protocols - Wide supply voltage range allows for flexible power options - Compact SO20 Wide package for space-constrained designs - High output current capability for driving LEDs or other devices
Disadvantages: - Limited to 16 output pins, may not be sufficient for complex applications requiring more outputs - Requires knowledge of I2C-bus communication protocol for proper usage - Not suitable for applications requiring high-speed data transfer
Working Principles
The PCA9535DWR operates as an I/O expander by communicating with a microcontroller or host device through the I2C-bus or SMBus interface. It receives commands from the master device to control the state (ON/OFF) and brightness level of each output pin. The open-drain outputs can sink current to drive LEDs or other devices connected to them.
Upon power-up, the internal power-on reset initializes the PCA9535DWR to a known state. The noise filter on the SCL/SDA inputs helps reduce interference from external sources. The device can be put into standby mode to minimize power consumption when not actively used.
Detailed Application Field Plans
The PCA9535DWR finds applications in various fields, including but not limited to: - Backlight control in LCD displays - Keypad illumination in consumer electronics - LED dimming in automotive interior lighting - General-purpose output expansion in industrial automation - Control of indicator LEDs in communication devices
Detailed and Complete Alternative Models
- PCA9555PW: 16-bit I2C-bus and SMBus I/O expander with interrupt output
- MCP23017-E/SO: 16-bit I/O expander with serial interface
- MAX7313ATE+: 16-bit I/O expander with push-pull outputs
- TCA9539PW: 16-bit I2C-bus and SMBus I/O expander with reset
- PCF8575CPW: 16-bit I2C-bus and SMBus I/O
Senaraikan 10 soalan dan jawapan biasa yang berkaitan dengan aplikasi PCA9535DWR dalam penyelesaian teknikal
Sure! Here are 10 common questions and answers related to the application of PCA9535DWR:
Q: What is PCA9535DWR? A: PCA9535DWR is a 16-bit I/O expander with an I2C interface, which allows for easy expansion of GPIO pins in technical solutions.
Q: How many GPIO pins can PCA9535DWR provide? A: PCA9535DWR provides 16 GPIO pins that can be used as inputs or outputs.
Q: What is the operating voltage range of PCA9535DWR? A: PCA9535DWR operates within a voltage range of 2.3V to 5.5V.
Q: Can PCA9535DWR handle higher voltages than its operating range? A: No, PCA9535DWR is not designed to handle voltages higher than its specified operating range.
Q: How can I communicate with PCA9535DWR using an I2C interface? A: You can communicate with PCA9535DWR by connecting it to an I2C bus and sending appropriate commands and data through the bus.
Q: Can PCA9535DWR be used as both input and output pins simultaneously? A: Yes, PCA9535DWR supports both input and output modes on its GPIO pins, allowing for flexible usage.
Q: Is PCA9535DWR capable of driving high-current loads? A: No, PCA9535DWR has limited current sourcing/sinking capabilities. It is recommended to use external drivers or buffers for high-current loads.
Q: Can PCA9535DWR be cascaded with other I/O expanders? A: Yes, PCA9535DWR can be cascaded with other I/O expanders to further increase the number of GPIO pins available in a system.
Q: Does PCA9535DWR have built-in pull-up resistors? A: Yes, PCA9535DWR has programmable internal pull-up resistors that can be enabled or disabled for each GPIO pin.
Q: Are there any application examples for PCA9535DWR? A: Yes, PCA9535DWR can be used in various applications such as LED control, keypad scanning, and general-purpose I/O expansion in microcontroller-based systems.
Please note that these answers are general and may vary depending on the specific implementation and requirements of your technical solution.