Zakładka z wyszukiwarką danych komponentów |
|
ISL22414WFU10Z Arkusz danych(PDF) 10 Page - Intersil Corporation |
|
ISL22414WFU10Z Arkusz danych(HTML) 10 Page - Intersil Corporation |
10 / 16 page 10 FN6424.1 December 16, 2010 Pin Description Potentiometer Pins RH AND RL The high (RH) and low (RL) terminals of the ISL22414 are equivalent to the fixed terminals of a mechanical potentiometer. RH and RL are referenced to the relative position of the wiper and not the voltage potential on the terminals. With WR set to 255 decimal, the wiper will be closest to RH, and with the WR set to 0, the wiper is closest to RL. RW RW 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 WR register. Bus Interface Pins SERIAL CLOCK (SCK) This is the serial clock input of the SPI serial interface. SERIAL DATA OUTPUT (SDO) The SDO is a serial data output pin. During a read cycle, the data bits are shifted out on the falling edge of the serial clock SCK and will be available to the master on the following rising edge of SCK. The output type is configured through ACR[1] bit for Push- Pull or Open Drain operation. Default setting for this pin is Push-Pull. An external pull up resistor is required for Open Drain output operation. Note, the external pull up voltage not allowed beyond VCC. SERIAL DATA INPUT (SDI) The SDI is the serial data input pin for the SPI interface. It receives device address, operation code, wiper address and data from the SPI remote host device. The data bits are shifted in at the rising edge of the serial clock SCK, while the CS input is low. CHIP SELECT (CS) CS LOW enables the ISL22414, placing it in the active power mode. A HIGH to LOW transition on CS is required prior to the start of any operation after power up. When CS is HIGH, the ISL22414 is deselected and the SDO pin is at high impedance, and (unless an internal write cycle is underway) the device will be in the standby state. Principles of Operation The ISL22414 is an integrated circuit incorporating one DCP with its associated registers, non-volatile memory and the SPI serial interface providing direct communication between host and potentiometer and memory. The resistor array is comprised of individual resistors connected in a 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. When the device is powered down, the last value stored in IVR will be maintained in the non-volatile memory. When power is restored, the content of the IVR is recalled and loaded into the WR to set the wiper to the initial position. DCP Description The DCP is implemented with a combination of resistor elements and CMOS switches. The physical ends of each DCP are equivalent to the fixed terminals of a mechanical potentiometer (RH and RL pins). The RW pin of the DCP is connected to intermediate nodes, and is equivalent to the wiper terminal of a mechanical potentiometer. The position of the wiper terminal within the DCP is controlled by an 8-bit volatile Wiper Register (WR). When the WR of a DCP contains all zeroes (WR[7:0]= 00h), its wiper terminal (RW) FIGURE 13. MIDSCALE GLITCH, CODE 7Fh TO 80h FIGURE 14. LARGE SIGNAL SETTLING TIME Typical Performance Curves (Continued) SCL WIPER CS WIPER UNLOADED, MOVEMENT FROM 0h to FFh ISL22414 |
Podobny numer części - ISL22414WFU10Z |
|
Podobny opis - ISL22414WFU10Z |
|
|
Link URL |
Polityka prywatności |
ALLDATASHEET.PL |
Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Linki | Lista producentów All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |