Internet of things (IOT) and industrial Internet of things (iiot) have become the pronouns of interconnected factories. They make traditional factories more intelligent to obtain the benefits brought by higher efficiency. Nowadays, the configuration of plant monitoring equipment is more and more common, such as chemical storage tanks, pump equipment, leakage detection equipment or fire prevention and control equipment. The next phase of iiot will involve factory connectivity and extend beyond the scope of the factory.
The sensing and control of wireless battery power supply plays an important role in the cost-effective integration of assets outside the traditional factory floor into the factory control infrastructure. Why is battery powered sensing and control important when it is beyond the original scope of the factory? The answer is simple: factories usually develop over time (sometimes even decades), and battery powered sensing and control functions can place nodes in places that might not have been thought of in the original factory design. Battery powered sensor and control nodes do not need special power supply and communication lines. Traditionally, power supply and communication wires are needed to expand to the original factory infrastructure, which leads to difficult deployment and high cost.
In order to integrate the battery powered sensing and control into the factory environment, the sensing and control nodes must be able to operate reliably in a longer period of time without replacing or charging the battery. Battery powered sensing and control implementations usually have elements such as sensors, low-voltage processors and wireless communication modules in their cores, all of which need to be operated in an extremely energy-efficient manner.
These kernel components usually need to select devices that may not be easy to operate with each other. For example, in low-voltage devices and their different operating modes, different input / output (I / O) voltage levels generally exist. Low power sensor I / O can work at 1.8 V when it is active, but in deep sleep mode, I / O can be reduced below 1 V to save battery life. Similarly, the I / O voltage level of the processor and communication module can operate at 2.5 V during active operation and then drop to a lower voltage in low power consumption mode.
How to integrate the core components of sensing and control design, and still achieve its low-power function? The answer is very simple: use TI’s AXC level converter series and other low-power level converter devices. The device not only supports low power operation, but also supports I / O level down to 0.65 V (from 3.3 V to 0.65 V). AXC level converters can realize low-power level conversion between core components of the interface, such as serial peripheral interface, universal asynchronous receiver transmitter, universal I / O and any other push-pull interface. They can also realize low-voltage I / O level conversion related to ultra-low power mode of these devices. The AXC series supports voltage levels as low as 0.65 V, enabling wireless battery powered sensing and control applications to enter a power-saving mode that limits the I / O level to less than 1 v.
The bit count range of AXC devices is from 1 to 8 bits. The low count single channel (sn74axc1t45) and dual channel (sn74axc2t45, sn74axc2t245) devices are packaged in extremely small square flat lead-free package, which is conducive to the common limited space design in iiot sensing and control. Fig. 1 shows an example of microcontroller and sensor links in active mode and sleep mode, and an example I / O level for each mode of operation.
Figure 1: microcontroller to sensor links in active and sleep modes
The link type shown in Figure 1 has been implemented in many industrial sensing applications, such as the communication module system used in factory automation. Devices such as sn74axc2t245 enable sensors and microcontrollers to operate efficiently in active mode while optimizing power efficiency in sleep or low power mode. In active mode and static mode, sn74axc2t245 has very low power consumption.
AXC level converter series can realize low voltage and low power iiot sense and control node. These nodes can be extended beyond the original area of the plant.