The MAX1669 fan controller includes a precise digital thermometer that reports the temperature of a remote sensor. The remote sensor is a diode-connected transistor-typically a low-cost, easily mounted 2N3906 PNP type-replacing conventional thermistors or thermocouples. Remote accuracy is ±3°C for transistors from multiple manufacturers, with no calibration needed. The MAX1669 has an independent fan controller with a low-current logic output requiring external power components to interface to a DC brushless fan. The fan controller has two modes of operation: a low-frequency (20Hz to 160Hz) PWM mode intended for driving the fan motor, or a high-impedance DAC output that generates a variable DC control voltage. In PWM mode, the FAN frequency can be synchronized to an external clock.

Other key features include general-purpose inputs/outputs (GPIOs) for fan presence detection and a thermostat output intended as a fan override signal in case the host system loses the ability to communicate. The internal ADC has a wide input voltage range and gives overrange readings when too large an input voltage is applied. Other error-checking includes temperature out-of-range indication and diode open/short faults.

The MAX1669 is available in a space-saving 16-pin QSOP package that allows it to fit adjacent to the SLOT1 connector.

• MAX8661 - 高效率、低IQ PMIC，具有动态电压管理，用于移动产品
• MAX8648 - 可驱动6只白光/RGB LED的超高效电荷泵，3mm x 3mm薄型QFN封装
• DS1243Y - 64k NV SRAM，带有隐含时钟
• MAX14936 - 四通道、5kVRMS数字隔离器
• MAX9619 - 高效、1.5MHz运算放大器，提供RRIO
• MAX3053 - ±80V故障保护、2Mbps、低电源电流CAN收发器
• MAX16946 - 远端天线、电流检测和LDO/开关
• MAX2622 - 单片压控振荡器
• MAX13038 - 汽车触点监测器和电平转换器，内置LDO稳压器
• MAX12553 - 14位、65Msps、3.3V ADC