LT3021
The LT3021 is a low dropout linear regulator with an output current of 500mA and a fixed output and output settable.
Main features: input voltage range 0.9-10V; typical differential pressure is 160mV/500mA; fixed output of 1.2, 1.5 and 1.8V (expressed by suffixes 1. 2, 1.5 and 1.8V) ); There is output configurable, the minimum output voltage is 200mV; the output capacitance is 3.3μF; in the range of lout=0～500mA, the load regulation rate is 0.2%; the quiescent current is 130μA; there is off control, when it is off Power consumption 3μA; current limit protection, reverse battery protection; no reverse current; overheat protection with hysteresis; 16-pin DFN package and 8-pin SO package; junction temperature -40 ~ 125 °C.
Applications: low-current power supplies, battery-powered electronics, cellular phones, wireless modems, and more.
Application Circuit: The output adjustable circuit is shown above. Output voltage Vout=O. 2V (1+R1/R2). The input capacitor is 2.2μF, the output capacitor is 3-3μF, and the chip multilayer ceramic capacitor is used. SHDN (off) is not used, connected to Vin (high level).
The figure above shows a fixed 1.2V output (model LT302l-1.2) circuit. The SENSE terminal is connected to Vout. When the SHDN terminal is connected to a high level, the circuit works. When connected to a low level, the power is turned off.
The utility model provides a scanner capable of scanning one-dimensional and two-dimensional barcodes, comprising: a casing and a scanning device, a start button is arranged on the casing, the scanning device is provided with a circuit board, and the circuit board carries a microcomputer A control processing module, an image capture module, and a laser light module; and the key point of the present invention is that the laser light module can emit a linear laser light and project it on a barcode, and the linear laser light is used as an indicator light (pointer). ), but when the scanning device wants to read the barcode, immediately turn off the linear laser light so as not to cause interference and affect the reading efficiency of the scanner.
1D Scanner ,1D Wired Barcode Scanner,1D 2D Barcode Scanner,1D Bar Code Scanner
ShengXiaoBang(GZ) Material Union Technology Co.Ltd , https://www.sxbgz.com