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ISL23711 Scheda tecnica(PDF) 2 Page - Intersil Corporation |
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ISL23711 Scheda tecnica(HTML) 2 Page - Intersil Corporation |
2 / 8 page 2 | www.intersil.com/DCPs-DCCs + + = Resistor Ladder Resolution: 4-bit to 10-bit RTOTAL: 1kΩ to 100kΩ DCP TSSOP, SC-70, SOT-23, µTQFN I2C, SPI, Up/Down, Pushbutton Register Store Non-volatile: E2PROM Volatile: RAM Digital Control Advantage DCP Mechanical Potentiometer Reliability Not susceptible to mechanical vibration & higher tolerance to environmental factors. Have moving parts, so can be more sensitive to vibration, humidity, etc. Power-up DCPs with EEPROM will store setting until user changes the value in memory (~100k to 1M times). If glue is used to prevent wiper movement, the device setting cannot be changed. Control Digital control - reduced manufacturing costs and enables factory automation Manual control – increases setup time and accuracy is reliant on technician Size Typically Smaller Typically Larger Advantage DCP DAC Flexibility of Output Terminals 3 terminals allow use as either voltage divider or variable resistor. Also allows user to change voltage at terminal ends. Terminals are usually fixed rail to rail. No flexibility to change between IOUT and VOUT. Power-up Output Setting Non-volatile DCPs have EEPROM where a user can store power-up settings. Output typically has default settings like Volatile DCPs. Digital Interface Multiple Choices: I2C, SPI, U/D, Push-button Primarily I2C or SPI ADVANtAgeS of DCP vs. DeViCeS with SimilAr fuNCtioNS WhAT IS A DCP? Digitally Controlled Potentiometers are integrated circuits incorporating a resistor ladder with its associated registers, non- volatile or volatile memory, and a digital interface providing direct communication between a host and both the resistor ladder and memory. register Store DCP wiper position is stored in a register. When power is reset, a volatile DCP typically sets the wiper position to midscale or zero-scale at power-up. When the power is cycled for a nonvolatile DCP, the last value stored in the EEPROM register is recalled, which loads the initial wiper value during power-up. Digital Control Digital control allows the user to select each switch in a “make before break” mode, transferring the potential to the wiper. DIGITAL POTENTIOMETERS iNterSil SeleCtioN guiDe DCP overview DCP Structure DCP = Digitally Controlled Potentiometer tap = Switch position on resistor string rtotAl = Total Resistance wiper (Vw/rw) = DCP output node DCP oVerView ACCESS CONTROL REGISTER (ACR) VOL SHDN WIP 0 0 0 0 0 VH /RH VL /RL VW/RW Only one closes at a time RTOTAL TAP 1 TAP 2 TAP 127 TAP 128 resistor ladder The resistor array is comprised of individual resistors connected in series. There are electronic switches (taps) at each resistor junction, which have a common output node called a wiper (VW/RW). Each physical end of the array is described as a terminal and referred to as VH/ RH and VL/RL, and the resistance between the terminals is referred to as RTOTAL. DATA 8 1 CLOCK |
Codice articolo simile - ISL23711 |
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