MAX7313

www.DataSheet4U.com 19-3059; Rev 4; 4/05 16-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection General Description The MAX7313 I 2 C™-compatible serial interfaced peripheral provides microprocessors with 16 I/O ports. Each I/O port can be individually configured as either an open-drain current-sinking output rated at 50mA and 5.5V, or a logic input with transition detection. A 17th port can be used for transition detection interrupt, or as a general-purpose output. The outputs are capable of driving LEDs, or providing logic outputs with external resistive pullup up to 5.5V. PWM current drive is integrated with 8 bits of control. Four bits are global control and apply to all LED outputs to provide coarse adjustment of current from fully off to fully on with 14 intensity steps. Each output then has individual 4-bit control, which further divides the globally set current into 16 more steps. Alternatively, the current control can be configured as a single 8-bit control that sets all outputs at once. The MAX7313 is pin and software compatible with the MAX7311, PCA9535, and PCA9555. Each output has independent blink timing with two blink phases. All LEDs can be individually set to be on or off during either blink phase, or to ignore the blink control. The blink period is controlled by a register. The MAX7313 supports hot insertion. All port pins, the INT output, SDA, SCL, and the slave-address inputs ADO-2 remain high impedance in power-down (V+ ...