MAX6678 is a dual-channel temperature monitor, dual PWM auto fan speed controller and five GPIO integrated device. It can monitor its own temperature and two external transistors connected in diode form. The device uses a 2-wire serial interface to provide digital temperature values. MAX6678 provides a programmable alarm output that can be used as an interrupt, throttling, or overheating shutdown signal.
The MAX6678 is a temperature‑to‑digital sensor that measures the temperature of an external diode or the chip’s own junction and provides the result over a 2‑wire SMBus interface. It can generate PWM alerts and supports up to four separate devices on the same bus.
The document lists absolute maximum ratings, electrical characteristics, pin‑out for QSOP and TQFN packages, SMBus timing parameters, and register descriptions, as well as guidelines for PWM output configuration and temperature data formatting. This manual is written in Japanese.
| Operating Supply Voltage Range | 3.0 V to 5.5 V |
|---|---|
| Operating Current | 0.5 mA to 1 mA |
| PWM Frequency Tolerance | -20 % to +20 % |
| Package Types | 20‑Pin QSOP, 20‑Pin TQFN |
The temperature data is an 8‑bit value where each LSB represents 1 °C.
The absolute maximum rating for VCC to GND is –0.3 V to +6 V.