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MAX5400 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX5400 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 8 page 256-Tap SOT-PoT, Low-Drift Digital Potentiometers in SOT23 6 _______________________________________________________________________________________ Detailed Description The MAX5400/MAX5401 consists of 255 fixed resistors in series between pins H and L. The potentiometer wiper (pin W) can be programmed to access any one of the 256 different tap points on the resistor string. The MAX5400/MAX5401 uses a 3-wire serial data interface to control the wiper tap position. This write-only inter- face contains three inputs: Chip-Select ( CS), Data In (DIN), and Data Clock (SCLK). When CS is taken low, data from the DIN pin is synchronously loaded into the 8-bit serial shift register on the rising edge of each SCLK pulse. The MSB is shifted in first as shown in Figure 4. Note that if CS is not kept low during the entire data stream, the data will be corrupted and the device will need to be reloaded. After all 8 data bits have been loaded into the shift register, they are latched into the decoder once CS is taken high. The decoder switches the potentiometer wiper to the tap position that corre- sponds to the 8-bit input data. Each resistor cell is 50k Ω/255 or 196.1Ω for the MAX5400 and 100kΩ/255 or 392.2 Ω for the MAX5401. The MAX5400/MAX5401 feature power-on reset (POR) circuitry that sets the wiper to the midscale position at power-up by loading a binary value of 128 into the 8-bit latch. The MAX5400/MAX5401 can be used as a variable resistor by connecting pin W to either pin H or pin L. POT REGISTER LOADED 1ST CLOCK PULSE SCLK DIN MSB LSB D0 D1 D2 D3 D4 D5 D6 D7 8TH CLOCK PULSE TIME CS Figure 2. Serial Interface Timing Diagram SCLK DIN tCSO tCSS tCL tCH tDS tDH tCP tCSH tCS1 tCSW CS Figure 3. Detailed Serial Interface Timing Diagram |
Número de pieza similar - MAX5400 |
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Descripción similar - MAX5400 |
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