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3 / 18 page ISL25700 FN6885 Rev 1.00 Page 3 of 18 July 23, 2014 Pin Configuration ISL25700 (10 LD µTQFN) TOP VIEW 9 8 7 6 1 2 3 4 RTH GND ISENSE VOUT CCOMP VDD SDA SCL O VDAC NC Pin Descriptions µTQFN PIN SYMBOL DESCRIPTION 1 VDD Power supply. This pins supplies the power necessary to operate the chip. 2SCL I2C interface input clock. This input is the serial clock of the I2C serial interface. SCL requires an external pull-up resistor. It has an internal pull-down resistor of ~3MΩ to prevent a floating input if the pin will be left unconnected. 3 SDA Open Drain Serial Data Input/Output for the I2C interface. The SDA is a bidirectional serial data input/output pin for I2C interface. It receives device address, operation code 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. The SDA pin requires an external pull-up resistor. It has an internal pull-down resistor of ~3MΩ to prevent a floating input if the pin will be left unconnected. 4 GND Ground. Bias and reference ground of the chip. 5RTH External NTC thermistor. An external NTC thermistor makes one shoulder of the Wheatstone bridge and must be connected between the RTH pin and GND. 6 VDAC DAC Output. This is the output of the precision 8-bit DAC. Default DAC output is in the range of 0V to 2V. The DAC output range can be extended with a gain of 2 by setting the DAC Gain bit. 7 VOUT Output voltage that controls an external P-MOSFET. This pin drives an external P-MOSFET proportional to unbalanced condition of the Wheatstone bridge. 8 ISENSE Current Sense input. This pin monitors voltage drop over an external current sense resistor RSENSE. Power dissipation of the P-MOSFET will be limited when ISENSE exceeds the voltage drop limit set in the Current Sense Register. 9 CCOMP Compensation capacitor. A compensation ceramic capacitor must be added between CCOMP and GND to increase chip stability. This capacitor provides a negative feedback for the operational amplifier and its value can be from 30pF to 1000pF. 10 NC Not internally connected. |
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