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MAX5479EUD Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX5479EUD Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 15 page Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers _______________________________________________________________________________________ 9 A simple 2-wire I2C-compatible serial interface moves the wiper among the 256 tap points (Figure 2). A non- volatile memory stores the wiper position and recalls the stored wiper position upon power-up. The non- volatile memory is guaranteed for 50 years for wiper data retention and up to 200,000 wiper store cycles. Analog Circuitry The MAX5477/MAX5478/MAX5479 consist of two resistor arrays with 255 resistive elements; 256 tap points are accessible to the wipers, along the resistor string between H_ and L_. The wiper tap point is selected by programming the potentiometer through the I2C inter- face. An address byte, a command byte, and 8 data bits program the wiper position for each potentiometer. The H_ and L_ terminals of the MAX5477/MAX5478/ MAX5479 are similar to the two end terminals of a mechanical potentiometer. The MAX5477/MAX5478/ MAX5479 feature power-on reset circuitry that loads the wiper position from the nonvolatile memory at power-up. Digital Interface The MAX5477/MAX5478/MAX5479 feature an internal, nonvolatile EEPROM that stores the wiper state for ini- tialization during power-up. The shift register decodes the command and address bytes, routing the data to the proper memory registers. Data written to a volatile memory register immediately updates the wiper posi- tion, or writes data to a nonvolatile register for storage (see Table 2). The volatile register retains data as long as the device is powered. Removing power clears the volatile regis- ter. The nonvolatile register retains data even after power is removed. Upon power-up, the power-on reset circuitry controls the transfer of data from the non- volatile register to the volatile register. A write-protect feature prevents accidental overwriting of the EEPROM. Connect WP to VDD or leave open to prevent any EEPROM write cycles. The wiper register only updates with the value in the EEPROM when WP = SDA SCL S START CONDITION P STOP CONDITION Figure 3. Start and Stop Conditions MSB START SCL SDA ACK A0 A2 A1 101 0 LSB NOP/W Figure 4. Slave Address 256-POSITION DECODER H_ L_ R255 S255 S254 S3 S2 S1 S256 R254 R2 R1 W_ RW WIPER CODE 02h Figure 2. Potentiometer Configuration |
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