SX1508B Datasheet | SEMTECH

RIPTION The SX1508B and SX1509B are plete ultra low voltage General Purpose parallel Input/Output (GPIO) expanders ideal for low power handheld battery powered equipment. This family of GPIOs es in 8-, 16-channel configuration and allows easy serial 2 expansion of I/O through a standard 400k Hz I C interface. GPIO devices can provide additional control and monitoring when the microcontroller or chipset has insufficient I/O ports, or in systems where serial munication 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 ponent 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). KEY PRODUCT Features - 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 15m A 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 8/16 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 Configured as GPO 2 400k Hz I C patible Slave Interface 4 User-Selectable I²C Slave Addresses Power-On Reset and Reset Input (NRESET) Ultra Low Current Consumption: 1u A Typ -40° C to +85° C Operating Temperature Range Up to 2k V HBM ESD Protection Small Footprint...