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ISL22346WFV20Z Folha de dados(PDF) 9 Page - Intersil Corporation |
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ISL22346WFV20Z Folha de dados(HTML) 9 Page - Intersil Corporation |
9 / 13 page 9 FN6177.0 July 28, 2006 Pin Descriptions Potentiometers Pins RHi and RLi (i = 0, 1, 2 or 3) The high (RHi) and low (RLi) terminals of the ISL22346 are equivalent to the fixed terminals of a mechanical potentiometer. RHi and RLi are referenced to the relative position of the wiper and not the voltage potential on the terminals. With WRi set to 127 decimal, the wiper will be closest to RHi, and with the WRi set to 0, the wiper is closest to RLi. RWi (i = 0, 1, 2 or 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 resistor to end-to-end open circuit condition on RHi and shorts RWi to RLi. 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 OR’d with SHDN bit in ACR register. I2C interface is still available in shutdown mode and all registers are accessible. This pin must remain HIGH for normal operation. Bus Interface Pins Serial Data Input/Output (SDA) The SDA is a bidirectional serial data input/output pin for I2C interface. It receives device address, operation code, wiper address and data from an I2C external master device at the rising edge of the serial clock SCL, and it shifts out data after each falling edge of the serial clock. SDA requires an external pull-up resistor, since it is an open drain input/output. Serial Clock (SCL) This is the serial clock input of the I2C serial interface. SCL requires an external pull-up resistor, since it is an open drain input. Device Address (A2 - A0) The address inputs are used to set the least significant 3 bits of the 7-bit I2C interface slave address. A match in the slave address serial data stream must match with the Address input pins in order to initiate communication with the ISL22346. A maximum of 8 ISL22346 devices may occupy the I2C serial bus. Principles of Operation The ISL22346 is an integrated circuit incorporating four DCPs with their associated registers, non-volatile memory and an I2C serial interface providing direct communication between a host and the potentiometers and memory. The resistor arrays are comprised of individual resistors connected in series. At either end of the array and between each resistor is an electronic switch that transfers the potential at that point to the wiper. The electronic switches on the device operate in a “make before break” mode when the wiper changes tap positions. FIGURE 13. MIDSCALE GLITCH, CODE 3Fh TO 40h FIGURE 14. LARGE SIGNAL SETTLING TIME Typical Performance Curves (Continued) Wiper Mid Point Movement from 3Fh to 40h RL RW RH FIGURE 15. DCP CONNECTION IN SHUTDOWN MODE ISL22346 |
Nº de peça semelhante - ISL22346WFV20Z |
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Descrição semelhante - ISL22346WFV20Z |
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