전자부품 데이터시트 검색엔진 |
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DS4301 데이터시트(PDF) 6 Page - Dallas Semiconductor |
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DS4301 데이터시트(HTML) 6 Page - Dallas Semiconductor |
6 / 7 page Detailed Description The DS4301 is a single nonvolatile digital potentiome- ter. This 32-position linear potentiometer has an end-to- end resistance of 200k Ω, and operates over a wide 2.4V to 5.5V supply voltage range. The wiper position is controlled by the three interface pins (U/D, CS, and INC), and the wiper setting can be stored in EEPROM on command. Power-Up On power-up, once a stable supply voltage of VCC MIN has been reached, the stored wiper setting is loaded from the EEPROM within tWLT. Also on power-up, the DS4301 wiper control pins become active approximate- ly tPU after a stable supply voltage of VCC MIN has been reached. Wiper Control Adjusting the wiper of the DS4301 involves using the three control pins (U/D, CS, and INC). See the Timing Diagram in Figure 2. To enable wiper adjustment, a high-to-low transition on the CS pin is required. Hold CS low for the duration of the communication. Doing this enables the INC pin to change the wiper position. Set the U/D pin high to increment or low to decrement the wiper position. The state of the U/D pin should be set more than tDI before the INC signal is transitioned from high to low. After the CS pin is active low, a high- to-low transition on the INC pin moves the wiper in the direction dictated by the U/D pin. Continue to pulse INC (high to low) until the desired wiper position is reached. On the last edge, hold the INC line low. With the desired wiper position set, there are two ways to proceed. One method terminates communication with- out allowing the value of the current wiper position to be written to the EEPROM. This is done by transitioning the CS signal to the high state before bringing the INC signal high. As long as the state of the CS pin is high before the state of the INC pin goes high, the current wiper setting is not written to EEPROM. Because the current wiper setting was not stored to the NV memory, the previously stored wiper setting, not the current wiper setting, is loaded from memory if power is cycled to the device The other method is used to store a new wiper setting in the EEPROM. This is done by bringing the state of the INC pin high for a time of tIC before bringing the state of the CS pin high. Once the states of both CS and INC pins are high, the current wiper setting is stored in EEPROM after a time of tWST. If power is Nonvolatile, 32-Position Digital Potentiometer 6 _____________________________________________________________________ VCC GND CS INC U/D CONTROL LOGIC UNIT NONVOLATILE MEMORY 5-BIT WIPER SETTING POS 31 POS 0 H L W VCC Figure 1. Block Diagram CS INC U/D tCI tIL tIH tF tIC tWST tCPH tDI tR WIPER STORAGE CONDITION WIPER NON-STORAGE CONDITION WIPER POSITION POSITION X POSITION X + 1 POSITION X tIW tIW tIK POSITION X - 1 VIL VIL VIL VIH VIH tCLP Figure 2. Timing Diagram |
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