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AD5123BCPZ10-RL7 Datasheet(PDF) 21 Page - Analog Devices |
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AD5123BCPZ10-RL7 Datasheet(HTML) 21 Page - Analog Devices |
21 / 28 page Data Sheet AD5123/AD5143 Rev. A | Page 21 of 28 ADVANCED CONTROL MODES The AD5123/AD5143 digital potentiometers include a set of user programming features to address the wide number of applications for these universal adjustment devices (see Table 15 and Table 17). Key programming features include the following: • Input register • Linear gain setting mode • Low wiper resistance feature • Linear increment and decrement instructions • ±6 dB increment and decrement instructions • Burst mode (I2C only) • Reset • Shutdown mode Input Register The AD5123/AD5143 include one input register per RDAC register. These registers allow preloading of the value for the associated RDAC register. These registers can be written to using Command 2 and read back using Command 3 (see Table 15). This feature allows a synchronous and asynchronous update of one or all of the RDAC registers at the same time. The transfer from the input register to the RDAC register is done synchronously by Command 8 (see Table 15). If new data is loaded in an RDAC register, this RDAC register automatically overwrites the associated input register. Linear Gain Setting Mode The patented architecture of the AD5123/AD5143 allows the independent control of each string resistor, RAW, and RWB. To enable linear gain setting mode, use Command 16 (see Table 15) to set Bit D2 of the control register (see Table 17). This mode of operation can control the potentiometer as two independent rheostats connected at a single point, W terminal, as opposed to potentiometer mode where each resistor is complementary, RAW = RAB − RWB. This mode enables a second input and an RDAC register per channel, as shown in Table 16; however, the actual RDAC contents remain unchanged. The same operations are valid for potentiometer and linear setting gain modes. The parts restore in potentiometer mode after a reset or power-up. Low Wiper Resistance Feature The AD5123/AD5143 include two commands to reduce the wiper resistance between the terminals when the devices achieve full scale or zero scale. These extra positions are called bottom scale, BS, and top scale, TS. The resistance between Terminal A and Terminal W at top scale is specified as RTS. Similarly, the bottom scale resistance between Terminal B and Terminal W is specified as RBS. The contents of the RDAC registers are unchanged by entering in these positions. There are three ways to exit from top scale and bottom scale: by using Command 12 or Command 13 (see Table 15); by loading new data in an RDAC register, which includes increment/decrement operations; or by entering shutdown mode, Command 15 (see Table 15). Table 11 and Table 12 show the truth tables for the top scale position and the bottom scale position, respectively, when the potentiometer or linear gain setting mode is enabled. Table 11. Top Scale Truth Table Linear Gain Setting Mode Potentiometer Mode RAW RWB RAW RWB RAB RAB RTS RAB Table 12. Bottom Scale Truth Table Linear Gain Setting Mode Potentiometer Mode RAW RWB RAW RWB RTS RBS RAB RBS Linear Increment and Decrement Instructions The increment and decrement commands (Command 4 and Command 5 in Table 15) are useful for linear step adjustment applications. These commands simplify microcontroller software coding by allowing the controller to send an increment or decrement command to the device. The adjustment can be individual or in a ganged potentiometer arrangement, where all wiper positions are changed at the same time. For an increment command, executing Command 4 automatically moves the wiper to the next resistance RDAC position. This command can be executed in a single channel or multiple channels. |
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