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SensorPath bus Description

The single wire SensorPath interface was developed by National Semiconductor in 2003 to implement thermal management on PC Mother Boards. The SensorPath interface shows up as the SWD pin on National ICs. The term SWD standards for Single Wire Data. SensorPath uses 3.3V single-ended signaling, with a pull-up resistor and open-drain low-side drive. The SensorPath Bus ICs interface to the SuperI/O family of controllers. The pull-up resistor seems to be optional with the value selected depending on the bus capacitance. The Digital Temperature Sensor LM95010 for example requires a 1.25k pull-up to 3.3 volts. If the Master already contains an internal pull-up, an external resistor is not required. The maximum allowable output load current is 4mA. Maximum capacitive load is 400pF.

National produces a number of devices with the SensorePath bus, a few are listed below.

National Semiconductor
{LM32, Dual Thermal Diode Temperature Sensor, Digital Temperature Sensor with SensorPath Bus}

TI
{Digital Out Temperature Sensor with Single-Wire SensorPath. Bus}

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