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ISL22449UFV14Z Datasheet(PDF) 8 Page - Intersil Corporation |
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ISL22449UFV14Z Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 13 page 8 FN6333.3 July 17, 2009 Pin Description Potentiometers Pins RWI (I = 0, 1, 2, 3) RWi is the wiper terminal and is equivalent to the movable terminal of a mechanical potentiometer. The position of the wiper within the array is determined by the WRi register. SHDN The SHDN pin forces the resistors to end-to-end open circuit condition and shorts all RWs to GND. When SHDN is returned to logic high, the previous latch settings put RWi at the same resistance setting prior to shutdown. This pin is logically ANDed with the SHDN bit in the ACR register. SPI interface is still available in shutdown mode and all registers are accessible. This pin must remain HIGH for normal operation. Bus Interface Pins SERIAL CLOCK (SCK) This is the serial clock input of the SPI serial interface. SERIAL DATA OUTPUT (SDO) The SDO is an open drain serial data output pin. During a read cycle, the data bits are shifted out at the falling edge of the serial clock SCK, while the CS input is low. SDO requires an external pull-up resistor for proper operation. FIGURE 7. END TO END RTOTAL % CHANGE vs TEMPERATURE FIGURE 8. TC FOR VOLTAGE DIVIDER MODE IN ppm FIGURE 9. MIDSCALE GLITCH, CODE 80h TO 7Fh FIGURE 10. LARGE SIGNAL SETTLING TIME Typical Performance Curves (Continued) -1.0 -0.5 0.0 0.5 1.0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (ºC) 50k 10k VCC = 5.5V VCC = 2.7V 0 15 30 45 60 75 90 105 16 36 56 76 96 TAP POSITION (DECIMAL) 50k 10k SIGNAL AT WIPER (WIPER UNLOADED) SIGNAL AT WIPER (WIPER UNLOADED MOVEMENT FROM 7Fh TO 00h) SCL RW FIGURE 11. DCP CONNECTION IN SHUTDOWN MODE ISL22449 |
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