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ISL95311 Datasheet(PDF) 6 Page - Intersil Corporation |
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ISL95311 Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 11 page 6 FN8084.0 May 6, 2005 NOTES: 1. Typical values are for TA = 25°C and 3.3V supply voltage. 2. LSB: [V(RW)127 – V(RW)0] / 127. V(RW)127 and V(RW)0 are V(RW) for the DCP register set to 7F hex and 00 hex respectively. LSB is the incremental voltage when changing from one tap to an adjacent tap. 3. ZS error = V(RW)0 / LSB. 4. FS error = [V(RW)127 – V+] / LSB. 5. DNL = [V(RW)i – V(RW)i-1] / LSB-1, for i = 1 to 127. i is the DCP register setting. 6. INL = V(RW)i – (i • LSB – V(RW)0) for i = 1 to 127. 7. for i = 16 to 120 decimal, T = -40°C to 85°C. Max( ) is the maximum value of the wiper voltage and Min ( ) is the minimum value of the wiper voltage over the temperature range. 8. MI = |R127 – R0| / 127. R127 and R0 are the measured resistances for the DCP register set to 7F hex and 00 hex respectively. 9. Roffset = R0 / MI, when measuring between RW and RL. Roffset = R127 / MI, when measuring between RW and RH. 10. RDNL = (Ri – Ri-1) / MI, for i = 16 to 127. 11. RINL = [Ri – (MI • i) – R0] / MI, for i = 16 to 127. 12. for i = 16 to 127, T = -40°C to 85°C. Max( ) is the maximum value of the resistance and Min ( ) is the minimum value of the resistance over the temperature range. 13. This parameter is not 100% tested. 14. tWP is the minimum cycle time to be allowed for any non-volatile Write by the user, unless Acknowledge Polling is used. It is the time from a valid STOP condition at the end of a Write sequence of a I2C serial interface Write operation, to the end of the self-timed internal non-volatile write cycle. Pin Descriptions Potentiometer Pins RH and RL RL and RH are referenced to the relative position of the wiper and not the voltage potential on the terminals. With WR set to 127, the wiper will be closest to RH, and with the WR set to 00, the wiper is closest to RL. R W 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. Bus Interface Pins SERIAL DATA INPUT/OUTPUT (SDA) The SDA is a bidirectional serial data input/output pin for the I2C interface. It receives device address, operation code, wiper register address and data from a 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 SCL. SDA requires an external pull-up resistor, since it’s an open drain input/output. SERIAL CLOCK (SCL) This input is the serial clock of the I2C serial interface. SCL requires an external pull-up resistor, since it’s an open drain input. DEVICE ADDRESS (A1–A0) The Address inputs are used to set the least significant 2 bits of the 8-bit I2C interface slave address. A match in the slave address serial data stream must be made with the Address input pins in order to initiate communication with the ISL95311. A maximum of 4 ISL95311 devices may occupy the I2C serial bus. Principles of Operation The ISL95311 is an integrated circuit incorporating one DCP with their associated register, non-volatile memory, and a I2C serial interface providing direct communication between a host and the potentiometers and memory. The resistor array is comprised of 127 individual resistors connected in series. At either end of the array and between each resistor is an electronic switch between that point and the wiper. The wiper, when at either fixed terminal, acts like its mechanical equivalent and does not move beyond the last position. That is, the counter does not wrap around when clocked to either extreme. 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 wiper position stored will be maintained in the nonvolatile memory. When power is restored, the contents of the memory are recalled and the wiper is set to the value last stored. TC V Max V RW () i () Min V RW () i () – Max V RW () i () Min V RW () i () + [] 2 ⁄ ---------------------------------------------------------------------------------------------- 106 125°C ----------------- × = TC R Max Ri () Min Ri () – [] Max Ri () Min Ri () + [] 2 ⁄ ---------------------------------------------------------------- 10 6 125°C ----------------- × = ISL95311 |
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