OIS21C
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OIS21C Optical smart sensor for hydraulic cylinders Cable color Brown Black Grey Name Vcc GND OUT General Description OIS21C is a patented smart optical device, which is usually combined with a hydraulic steering cylinder. The main application is on rough terrain machines, to detect when the wheels are correctly aligned. The alignment occurs when the sensor detects a different refraction index zone, which is marked on the hydraulic cylinder. As the sensor is mounted on the cylinder, the applications can be multiple, wherever a cylinder is present. The product is available in 6 different versions, for example with M12 4 pole standard connector, with 3 pole automotive connectors or with open leads 3 wire in different lengths. The product is based on reflective sensor as input stage, a computing unit based on microprocessor device and an output high side driver, which is able to drive high current load, up to 700mA. The sensor includes “smart” functions that are able to improve the life of the system, the reliability (MTTFd>120years) and guarantee the robustness in a harsh environment (temperature variations, cylinder markers wearing, component degradation, presence of electromagnetic disturbs etc.). Applications Steering machines Surface cleaning machines Rough terrain machines Road Agricultural machines Logistic machines Loaders Features ■ High input voltage range ■ High temperature range ■ High current output ■ Meets ISO 7637 normative, including pulse 5 “load dump“ ■ MTTFd > 120 years ■ Inversion of polarity protection ■ Overload protection ■ Smart interface and smart algorithm ■ Compliant to RoHS European Directive ■ Designed for earth moving environment ■ Customizable on different parameters 2 NC Do not connect, for internal use only 3 GND Ground Function Power Supply Ground Output (PNP) OIS21C-M12 With a 4 pole M12 male connector, no cable OIS21C-CAB With a 3.5m cable, open leads OIS21C-AT With a 50cm cable + Amphenol AT04-3P OIS21C-C25-M12 With a 25cm cable + Binder 4 pole M12 male

ABSOLUTE MAXIMUM RATINGS

OIS21C MECHANICAL DIMENSIONS OIS21C-M12 The dimensions are expressed in mm, tolerance ±0.1mm. Figure 1 –M12 straight version MECHANICAL DIMENSIONS ALL OTHER VERSIONS The dimensions are expressed in mm, tolerance ±0.1mm. Figure 2 –right angle versions

Figure 3 –DT and open leads configuration Figure 4 – DTM configurations (DTM and DTMI)

Table 1 - compliance table

OIS21C Application circuits _________________________________________________________________Resistive load A typical output load is a lamp. For such resistive loads no precautions shall be taken: the output stage is protected against reverse of polarity, short circuit and temperature. The power absorbed by the output stage is equal to RDSON * Iload. Figure 6 – resistive load connection and VOUT transition graph Inductive load_________________________________________________________________ Inductive loads are described by inductance L and resistance R. At switch ON, the inductive load...

against overvoltages. If the VDs of the output stage during the transitory becomes very high (double the Vcc value) for long period, it can destroy the mosfet or the zener protection diode inside the output stage. In order to avoid this possible situation, the use of a freewheeling diode in parallel to the load is recommended. Freewheeling diode Relay The load must be connected to GND (pup version) Figure 8 - inductive load connection with protection freewheeling diode Figure 9 - Vqut transitions without and with freewheeling diode

OIS21C Load dump considerations__________________________________________________ Load dump means the disconnection of a powered load. It can cause large voltage spikes from the inductive generator(s). In automotive electronics, it refers to the disconnection of the vehicle battery from the alternator while the battery is being charged. Due to such a disconnection of the battery, other loads connected to the alternator see a surge in power line. Load dump may occur as a result of cable corrosion, poor connection or of intentional disconnection with the engine running. The pulse shape and...