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PCA9539PW
+BOMIC XPND 400KHZ I2C SMBUS 24TSSOP
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ManufacturerTexas Instruments
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Mfr. Part #PCA9539PW
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In Stock4682
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Specifications
| Attribute | Value |
| Part Status | Obsolete |
| Base Product Number | PCA9539 |
| DigiKey Programmable | Not Verified |
| Number of I/O | 16 |
| Interface | I2C, SMBus |
| Interrupt Output | Yes |
| Features | POR |
| Output Type | Push-Pull |
| Current - Output Source/Sink | 10mA, 25mA |
| Clock Frequency | 400 kHz |
| Voltage - Supply | 2.3V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Package | 24-TSSOP (0.173", 4.40mm Width) |
| Supplier Device Package | 24-TSSOP |
| Packaging | Tube |
Overview
Description
Key features include interrupt output for input change notification, configurable I/O ports, and a low standby current, which is crucial for power-sensitive applications. The PCA9539PW offers a high-speed I2C-bus interface, supporting standard-mode (100 kHz), fast-mode (400 kHz), and fast-mode plus (1 MHz) operations. Its compact TSSOP package makes it suitable for space-constrained designs.
The expander is commonly used in applications requiring additional GPIOs, such as in embedded systems, consumer electronics, and industrial automation. It simplifies design by offloading GPIO functions from the main processor, enabling efficient and flexible control of multiple I/O peripherals.
Equivalent
1. TCA9539 by Texas Instruments, offering similar functionality.
2. MCP23017 by Microchip Technology, which provides 16-bit I/O expansion capabilities.
3. PCAL9539A by NXP, featuring similar I2C I/O port expansion with interrupt functionality.
These alternatives have varying features and specifications, so it's important to match specific requirements.
Features
The PCA9539PW supports fast-mode I2C with data rates up to 400 kHz. It includes two address pins, allowing up to four devices to be connected on the same I2C bus. It also has a low standby current consumption, enhancing power efficiency in battery-operated applications. The device is typically used in applications where additional I/O ports are needed, such as in complex control systems, instrumentation, and data acquisition systems. Its small TSSOP package makes it suitable for space-constrained applications.
Pinout
1. Pins 1-8 (P0_0 to P0_7): 8-bit I/O port 0.
2. Pin 9 (GND): Ground.
3. Pins 10-17 (P1_0 to P1_7): 8-bit I/O port 1.
4. Pin 18 (/INT): Interrupt output, active low.
5. Pin 19 (/RESET): Active low reset input.
6. Pin 20 (SCL): I²C-bus clock input.
7. Pin 21 (SDA): I²C-bus data input/output.
8. Pins 22-24 (A0, A1, A2): I²C-bus slave address inputs.
The PCA9539PW allows bidirectional data transfer over an I²C-bus and provides two 8-bit input/output ports. It also includes features such as interrupt output for detecting changes and a reset that returns the device to its default state.
Manufacturer
Application
1. Microcontroller I/O Expansion: Extends the I/O capability of microcontrollers with limited GPIO pins.
2. LED Control: Manages multiple LEDs with fewer microcontroller pins.
3. Button and Switch Monitoring: Reads the status of numerous buttons or switches.
4. Sensor Interface: Connects additional sensors in IoT devices.
5. Industrial Systems: Used in PLCs and other control systems to handle more I/O signals.
6. Consumer Electronics: Integrates in devices requiring multiple input/output operations without extensive PCB redesign.
Its compatibility with the I2C interface enables easy integration into various systems.
Package
Frequently Asked Questions
Q: What is the maximum clock frequency supported by the PCA9539PW?
A: The PCA9539PW supports a maximum clock frequency of 400 kHz for I2C and SMBus interfaces.
Q: Does this device provide an interrupt output for monitoring input changes?
A: Yes, the PCA9539PW features an interrupt output, which alerts the master on input state changes.
Q: What is the operating voltage range for this I/O expander?
A: The device operates from 2.3V to 5.5V, making it suitable for both 3.3V and 5V systems.
Q: How many I/O pins are available on the PCA9539PW?
A: This component provides 16 bidirectional I/O pins configured as push-pull outputs.
Q: What is the typical current drive capability per I/O pin?
A: The output can source 10mA and sink 25mA per pin, sufficient for driving LEDs or small loads.
Q: Is the PCA9539PW suitable for surface mount assembly?
A: Yes, it comes in a 24-TSSOP surface mount package with a 4.40mm width for standard PCB designs.
Q: Does the PCA9539PW include a Power-On Reset (POR) feature?
A: Yes, it has an internal POR circuit that initializes all I/O registers to a known state at power-up.
