Semtech SX1508B and SX1509B Ultra-Low Voltage GPIOs are general-purpose parallel input/output expanders ideal for low-power handheld battery-powered equipment. This family of GPIOs comes in 4-, 8-, and 16-channel configuration options and allows easy serial expansion of I/O through a standard 400kHz I2C interface. These devices come with a fully programmable LED Driver with an internal oscillator for enhanced lighting control. 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.
