SX1508QBIULTRT

The SX1508QBIULTRT are complete ultra low voltage General Purpose parallel Input/Output (GPIO) expanders ideal for low power handheld battery powered equipment. This family of GPIOs comes in 8-, 16-channel configuration and allows easy serial expansion of I/O through a standard 400kHz I²C interface. GPIO devices can provide additional control and monitoring when the microcontroller or chipset has insufficient I/O ports, or in systems where serial communication and control from a remote location is advantageous.These devices can also act as a level shifter to connect a microcontroller running at one voltage level to a component running at a different voltage level, thus eliminating the need for extra level translating circuits. The core is operating as low as 1.425V while the dual I/O banks can operate between 1.2V and 3.6V independent of the core voltage and each other (5.5V tolerant).The SX1508QBIULTRT feature a fully programmable LED Driver with internal oscillator for enhanced lighting control such as intensity (via 256- step PWM), blinking and breathing (fade in/out) make them highly versatile for a wide range of LED applications.The keypad applications are also supported with an on-chip scanning engine that enables continuous keypad monitoring up to 64 keys without any additional host interaction reducing bus activity.The SX1508QBIULTRT have the ability to generate mask-programmable interrupts based on a falling/rising edge of any of its GPIO lines. A dedicated pin (NINT) indicates to a host controller that a state change occurred on one or more of the lines. Each GPIO is programmable via a bank of 8-bit configuration registers that include data, direction, pull-up/pull-down, interrupt mask and interrupt registers. These I/O expanders feature small footprint packages and are rated from -40°C to +85°C temperature range.

• 1.2V to 3.6V Low Operating Voltage with Dual Independent I/O Rails (Vcc1, Vcc2)
  • Enable Direct Level Shifting Between I/O Banks and Host Controller
• 5.5V Tolerant I/Os, Up to 15mA Output Sink on All I/Os (No Total Sink Current Limit)
• Integrated LED Driver for Enhanced Lighting
  • Intensity Control (256-step PWM)
  • Blink Control (224 On/Off values)
  • Breathing Control (224 Fade In/Out values)
• On-Chip Keypad Scanning Engine
  • Support Up to 8x8 Matrix (64 Keys)
  • Configurable Input Debouncer
• 8 Channels of True Bi-directional Style I/O
  • Programmable Pull-up/Pull-down
  • Push/Pull or Open-drain outputs
  • Programmable Polarity
• Open Drain Active Low Interrupt Output (NINT)
  • Bit Maskable
  • Programmable Edge Sensitivity
• Built-in Clock Management (Internal 2MHz Oscillator/External Clock Input, 7 clock values)
  • OSCIO can be Co