The single wire SensorPath interface was developed by National Semiconductor in 2003 to implement thermal management on PC Mother Boards. SensorPath I/O |
The Single Wire Data line uses Pulse Width Modulation [PWM] to send data over the line.
Five bit types are used; Data Bit 0, Data Bit 1, Start Bit, Attention Request, and Reset.
Companies producing SensorPath components:
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 Texas Instruments
{Digital Out Temperature Sensor with Single-Wire SensorPath Bus}
The partial schematic diagram shows the I/O ports as FET drivers and not TTL ports. However the I/O is TTL compatible.
The devices found to date appear to all be 3.3 volt devices, which of course is the new standard voltage rail [surpassing 5 volts].
Editor Note Not all electrical interfaces need to be determined when doing circuit design.
In some cases the use of an interface between devices is assumed based on the parts selected for other reasons and not based on the interface at all.
For example a part selected for it's performance might define the usage of the SWD because of its presence on the IC.
That is, a particular single wire interface might be used because it resides on an integrated circuit already being used for other reasons.
That's not saying anything for or against SWD, just that the primary function of the IC is what's normally being selected.
However, there may be those times when an IC may be produced in two versions, one with a particular interface and one with another interface.
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