Microchip Technology MIC74 I/O Expanders
Microchip Technology MIC74 I/O Expanders are 2-wire serial I/O expanders and fan controllers with the SMBus™ (System Management Bus) protocol. The SMBus acts as a slave on the bus and provides eight independent I/O lines. Each I/O bit can be individually programmed as an input or output. These MIC74 I/O expanders have an internal clock generator and state machine to eliminate the overhead generally associated with bit-banging fan speed control. The expanders are available in ultra-small footprint 16-pin QSOP. The MIC74 expanders feature a low quiescent current and low package height that makes the expanders ideal for portable and desktop applications.
Features
- Provides eight bits of general-purpose I/O
- Built-in fan speed control logic
- 2-wire SMBus™/I2C™ compatible serial interface plus interrupt output
- 2.7V to 3.6V operating output voltage
- 5V tolerant I/O
- 3μA low quiescent current
- Bit programmable I/O options:
- Input or output
- Push-pull or open-drain output
- Interrupt on input changes
- Outputs can directly drive LEDs (10mA IOL)
- Up to 8 devices per bus
Applications
- General purpose I/O expansion via serial bus
- Personal computer system management
- Distributed sensing and control
- Microcontroller I/O expansion
- Fan control
Typical Application Circuit
Pin Configuration Diagram
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Published: 2019-12-31
| Updated: 2023-06-13