Microchip Technology, Inc. I/O Expanders MIC74BQS

The MIC74BQS is a 2-wire serial I/O expander and fan controller from Quarktwin Technology Ltd. It provides eight bits of general-purpose I/O, which can be individually configured as inputs or outputs. The device supports a 2-wire SMBus/I²C-compatible interface and features an interrupt output for state change notifications. It operates within a voltage range of 2.7V to 3.6V and is designed to be 5V-tolerant on its I/O lines. The MIC74BQS has a low quiescent current of 2 µA, making it suitable for battery-powered applications. The I/O options are bit-programmable, allowing for configurations such as push-pull or open-drain outputs, and the outputs can directly drive loads like LEDs with a current of up to 10 mA. Additionally, the device can manage fan speed control using its built-in logic, which eliminates the need for complex external circuitry. With the capability to connect up to eight devices on the same bus, the MIC74BQS is ideal for applications requiring I/O expansion, such as personal computer system management, distributed sensing, and control systems. Its compact 16-pin QSOP package makes it suitable for space-constrained designs.