Digital potentiometer circuit with built-in E2PROM

A digitally controlled potentiometer (DCP) is a variable resistor whose resistance can be freely set by an external microprocessor or the like. Unlike mechanical potentiometers, it has no moving parts and therefore has excellent environmental resistance. in addition. It can automatically adjust the resistance value. This saves the adjustment time of the potentiometer. X9315W is a digital potentiometer launched by Xicor Company in the United States. Its total resistance is 10kΩ and the number of contact taps is 32. X9315W contains E2PROM, even after the power is cut off. The set resistance value can still be remembered. Features and Working Principle Pictures related to this topic are as follows: X9315W has the following features: (1) Low noise. (2) Contains E2PROM, which can memorize the position of movable contacts; (3) The resolution is 3%. The number of contact taps is 32; (4) The retention time of active contact position data is 100 years; (5) Low power consumption. "The pin arrangement of X9315W is shown in Figure 1, and Table 1 shows its pin functions. Figure 2 is the internal block diagram of X9315W." The switch conversion in Figure 2 adopts the so-called "turn on before turning off" method. In other words, when the movable contact is simulated to move and the two switches are switched continuously, the CMOS switch that is about to be turned off has not yet been turned off. The other CMOS switch is still turned on. Therefore, before the control ends and the position of the movable contact is determined, the resistance between the RH/VH terminal and the RL/VL terminal will drop instantly. Pictures related to this topic are as follows: read from memory and set automatically. Table 3 shows the main electrical characteristics of X9315W. Related pictures on this topic are as follows: Application example Figure 3 is an astable multivibrator circuit composed of an analog timer IC (ICM7555). The timing time can be set by the microprocessor through the digital potentiometer X9315W. Pictures related to this topic are as follows: