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MAX5386MATE+ Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX5386MATE+ Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page Dual, 256-Tap, Volatile Low-Voltage Linear Taper Digital Potentiometers 8 ______________________________________________________________________________________ Detailed Description The MAX5386/MAX5388 dual, 256-tap, volatile low-volt- age linear taper digital potentiometers offer three end-to- end resistance values of 10kI, 50kI, and 100kI. Each potentiometer consists of 255 fixed resistors in series between terminals H and L. The potentiometer wiper, W, is programmable to access anyone of the 256 tap points on the resistor string. The potentiometers in each device are programmable independently of each other. The MAX5386/MAX5388 have an SPI interface. SPI Digital Interface The MAX5386/MAX5388 include an SPI interface, which provides a 3-wire write-only serial data interface to con- trol the wiper tap position through inputs chip select (CS), data in (DIN), and data clock (SCLK). Drive CS low to load data from DIN synchronously into the serial shift register on the rising edge of each SCLK pulse. The MAX5386/MAX5388 load the last 9 bits of clocked data once CS transitions high. See Figures 2 and 3. After all the data bits are shifted in, data are latched into the appropriate potentiometer control register when CS goes from low to high. Data written to a memory register immediately updates the wiper position. Keep CS low during the entire data stream to prevent the data from being terminated. The first bit A0 (address bit) addresses one of the two potentiometers; writing a zero in A0 addresses control register A and writing a one in A0 addresses control reg- ister B. See Table 1. The power-on reset (POR) circuitry sets the wiper to midscale (D[7:0] 1000 0000). The 8 data bits (D7–D0) indicate the position of the wiper. For D[7:0] = 0000 0000, the wiper moves to the position closest to L. For D[7:0] = 1111 1111, the wiper moves closest to H. D[7:0] is 1000 0000 following power- on for both registers A and B. Register A: The data byte writes to register A, and the wiper of potentiometer A moves to the appropriate posi- tion at the rising edge of CS. D[7:0] indicates the posi- tion of the wiper. D[7:0] = 0000 0000 moves the wiper to the position closest to L. D[7:0] = 1111 1111 moves the wiper to the position closest to H. D[7:0] is 1000 0000 following power-on. Register B: The data byte writes to register B, and the wiper of potentiometer B moves to the appropriate posi- tion at the rising edge of CS. D[7:0] indicates the posi- tion of the wiper. D[7:0] = 0000 0000 moves the wiper to the position closest to L. D[7:0] = 1111 1111 moves the wiper to the position closest to H. D[7:0] is 1000 0000 following power-on. Table 1. SPI Register Map Bit Number 1 2 3 4 5 6 7 8 9 Bit Name A0 D7 D6 D5 D4 D3 D2 D1 D0 Write Wiper Register A 0 D7 D6 D5 D4 D3 D2 D1 D0 Write Wiper Register B 1 D7 D6 D5 D4 D3 D2 D1 D0 |
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