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ISL22317WFRTZ Folha de dados(PDF) 10 Page - Intersil Corporation |
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ISL22317WFRTZ Folha de dados(HTML) 10 Page - Intersil Corporation |
10 / 15 page 10 FN6912.0 May 26, 2009 Pin Description Potentiometers Pins RH AND RL The high (RH) and low (RL) terminals of the ISL22317 are equivalent to the fixed terminals of a mechanical potentiometer. RH and RL are referenced to the relative position of the wiper and the voltage potential on the terminals. With WR set to 127 decimal, the wiper will be closest to RH. With the WR set to 0, the wiper is closest to RL. The voltage potential on the RH terminal must be higher than voltage potential on RL terminal. 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. REF_A, REF_B REF_A and REF_B are pins to connect an external resistor. If application is required to connect RL terminal to GND, then the REF_B pin should also be connected to GND. Warning! Do not connect REF_A to GND under any circumstances. That may damage the ISL22317. 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 input is the serial clock of the I2C serial interface. DEVICE ADDRESS (A1) The address input is used to set the A1 bit of the 7-bit I2C interface slave address, see Table 3. A match in the slave address serial data stream must match with the Address input pins in order to initiate communication with the FIGURE 17. TC FOR RHEOSTAT MODE (10k/50k/100k) IN ppm [RREF 2ppm/°C] FIGURE 18. TC FOR VOLTAGE DIVIDER MODE (10k/50k/100k) IN ppm [RREF 10ppm/°C] FIGURE 19. STANDBY ICC vs TEMPERATURE FIGURE 20. WIPER RESISTANCE vs TAP POSITION WHEN PRECISION IS OFF Typical Performance Curves (Continued) 0 10 20 30 40 15 35 55 75 95 115 TAP POSITION (DECIMAL) VCC = 5.5V VCC = 2.7V 0 10 20 30 40 15 35 55 75 95 115 TAP POSITION (DECIMAL) VCC = 5.5V VCC = 2.7V 0 200 400 600 800 -40 0 40 80 120 TEMPERATURE (°C) VCC = 5.5V VCC = 2.7V 0 20 40 60 80 100 0 20406080 100 120 TAP POSITION (DECIMAL) T = +125°C T = +25°C T = -40°C VCC = 5.5V ISL22317 |
Nº de peça semelhante - ISL22317WFRTZ |
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Descrição semelhante - ISL22317WFRTZ |
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