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MAX5410EEE Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX5410EEE Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 13 page Dual, Audio, Log Taper Digital Potentiometers 6 _______________________________________________________________________________________ Detailed Description Digital Serial Interface An SPI-compatible serial interface controls the MAX5408–MAX5411. The input word to the device is eight bits long, composed of three address bits (A0, A1, and A2), followed by five data bits, with MSB first (see Tables 1 and 2). The first three address bits set the value of internal registers. The five data bits control the wiper position. For certain commands, some of the five data bits are “don’t cares”, but must be sent to the device. The serial data is listed in Tables 1 and 2. The control code determines: • Potentiometer to update or register to set. • Data for mute register (Tables 3 and 4). • Data for zero-crossing detection register (Tables 5 and 6). The data bits control the position of the wiper (Table 7). A logic low on the chip-select input (CS) enables the device’s serial interface. A logic high on CS disables the interface control circuitry. See Figure 1 for serial- interface timing description. 8-BIT SERIAL WORD A0 A1 A2 D4–D0 FUNCTION 0 0 0 5-bit DAC data Set position of wiper W0A 0 0 1 5-bit DAC data No change 0 1 0 5-bit DAC data Set position of wiper W1A 0 1 1 5-bit DAC data No change 1 0 0 4-bit mute data, D0 = “don’t care” Data for mute register (see Table 3) 10 1 4-bit zero-crossing detection data, D0 = “don’t care” Data for zero-crossing detection register (see Table 5) 1 1 0 00000 Readback contents of wiper register for W0A at DOUT 1 1 0 00001 No change 1 1 0 00010 Readback contents of wiper register for W1A at DOUT 1 1 0 00011 No change 1 1 0 00100 Readback contents of mute register at DOUT 1 1 0 00101 Readback contents of zero-crossing detection register at DOUT 1 1 1 D4 = 0, D3–D0 = “don’t care Immediate update then analog power-down when zero crossing is enabled. No effect when zero crossing is disabled. Table 1. Serial Interface Programming Commands for MAX5408/MAX5410 tCSS tCL tCH tDS tDH tCP tCSH tCSI tCSW tDO tIW WIPER DOUT DIN SCLK CS DOUT DIN SCLK CS Figure 1. Serial Timing Diagram |
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