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ISL21400USB-EVALZ 데이터시트(PDF) 10 Page - Renesas Technology Corp |
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ISL21400USB-EVALZ 데이터시트(HTML) 10 Page - Renesas Technology Corp |
10 / 17 page ISL21400 FN8091 Rev 3.00 Page 10 of 17 March 31, 2011 Pin Descriptions VOUT Programmable voltage output pin. Absolute voltage is determined by device temperature and Equation 1. Drive capability is limited to ±500µA output current and 5000pF output capacitance. A2, A1, A0 Hardware slave address pins that can be used to provide several ISL21400 with a unique physical address to allow for multiple devices off one I2C bus. GND This is the circuit ground pin. It is common for the VOUT and control signal inputs. SDA Serial Data Input/Output. Bidirectional pin used for serial data transfer. As an output, it is open drain and may be wire-ored with any number of open drain or open collector outputs. A pull-up resistor is required and the value is dependent on the speed of the serial data bus and the number of outputs tied together. SCL Serial Clock Input. Accepts a clock signal for clocking serial data into and out of the device. The SCL line requires a pull-up resistor whose value is dependent on the speed of the serial clock bus and the number of inputs tied together. VCC Positive Power Supply. Connect to a voltage supply in the range of 2.7V<VCC<5.5V, with minimum noise and ripple. For best performance, bypass with a 0.1µF capacitor to ground. If the AV gain is set to 4 and VOUT approaches 5.0V, then VCC must be set to >5.2V for best output performance. Functional Description Functional Overview Refer to the Functional Block Diagram on page 2. The ISL21400 provides a programmable output voltage which combines both a temperature independent term and a temperature dependent term. The temperature independent term uses a bandgap voltage reference, and the temperature dependent term uses a Proportional To Absolute Temperature (PTAT) reference, or Temperature Sensor. Each voltage source is scalable using two DACs via the I2C serial bus. The resulting output voltage can vary from 0V to over 5V and has a variable, programmable Temperature Slope (TS). Reference Sections Referring to the Block Diagram on page 2, the VREF and Temperature Sense (VTS) outputs are summed together () and then passed through the output gain stage (A). The voltage output is programmable and is determined by Equation 1: where: •AV = 1, 2, 4 •VREF = 1.200 (not temperature dependent) •0 n 255 (setting contained in Register 0, VREF) •VTS = K(T - T0) • K = dVTS/ dT = -2.1mV/C • T = device temperature •T0 = +25°C •0 m 255 (setting contained in Register 1, TS) See “Applications Information” on page 14 for ways to use Equation 1 and methods for output voltage calculations. FIGURE 13. VOUT vs IOUT (±1mA) Typical Performance Curves (Continued) 1.200 1.201 1.202 1.203 1.204 1.205 1.206 1.207 1.208 1.209 -1 -0.5 0 0.5 1 IOUT (mA) VREF REGISTER = 255d TS REGISTER = 127d AT +25°C VOUT AV VREF n 255 ---------- VTS 2m 255 – 255 -------------------------------- + = (EQ. 1) |
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