Semtech Corporation SX1509BIULTRT
| Parameters | |
|---|---|
| Series | - |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| RoHS Status | RoHS Compliant |
| Package / Case | 28-UFQFN Exposed Pad |
| Interface | I²C |
| Mfr | Semtech Corporation |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C ~ 85°C |
| Output Type | Open Drain, Push-Pull |
| Supplier Device Package | 28-QFN-UT (4x4) |
| Number of I/O | 16 |
| Voltage - Supply | 1.425V ~ 3.6V |
| Clock Frequency | 400 kHz |
| Current - Output Source/Sink | 8mA, 15mA |
| Interrupt Output | Yes |
| Features | Keypad Controller, LED Output, POR |
| Package | Tape & Reel (TR) |
| Product Status | Active |
| Base Product Number | SX1509 |
| Standard Package | 3,000 |
| ECCN | EAR99 |
| HTSUS | 8542.39.0001 |
SX1509BIULTRT GPIO Expander, 16-Channel I/O Expander I²C 400 kHz
The SX1509BIULTRT is a versatile 16-channel GPIO (General Purpose Input/Output) expander designed to expand the I/O capabilities of microcontrollers and embedded systems. This chip supports both input and output operations, making it ideal for applications requiring additional digital control, such as LED matrix driving, button matrix scanning, sensor interfacing, and relay control. With its I²C interface, the SX1509BIULTRT allows easy integration into existing systems, reducing the need for complex wiring and PCB space. Its low power consumption and wide operating voltage range (1.2V to 3.6V) make it suitable for battery-powered and low-power embedded applications.
Featuring configurable input/output pins, the SX1509BIULTRT supports open-drain outputs with programmable slew rate control, reducing EMI (Electromagnetic Interference) in noise-sensitive environments. The chip includes an internal oscillator, eliminating the need for an external clock source, and supports interrupt generation on input pin changes, enabling efficient event-driven system design. Additionally, the SX1509BIULTRT provides a built-in debounce filter for button inputs, improving reliability in user interface applications. Its compact TSSOP-20 package ensures space efficiency in tight PCB layouts.
The SX1509BIULTRT is designed for high reliability and ease of use, with built-in protection features such as overcurrent and overvoltage safeguards on output pins. It supports 16 configurable GPIOs, with each pin individually programmable as input or output, and includes a PWM (Pulse Width Modulation) generator for dimming LEDs or controlling motor speed. The chip’s I²C address selection via external pins allows multiple SX1509BIULTRT devices to coexist on the same bus, maximizing system flexibility. Its low standby current and fast wake-up time make it ideal for power-sensitive applications, including wearable electronics, industrial control panels, and IoT devices.
For applications requiring alternative GPIO expanders, consider the following comparable chips:
● MCP23017: A 16-bit I/O expander with SPI and I²C interfaces, supporting interrupt-on-change and configurable pull-up resistors.
● PCA9535: A 16-bit GPIO expander with I²C interface, offering interrupt generation and configurable input/output modes.
● TPIC6B595: An 8-bit shift register with open-drain outputs, suitable for driving LEDs and relays in high-current applications.
