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LM63DIMA Datasheet(PDF) 2 Page - National Semiconductor (TI) |
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LM63DIMA Datasheet(HTML) 2 Page - National Semiconductor (TI) |
2 / 28 page Pin Descriptions Pin Name Input/Output Function and Connection 1V DD Power Supply Input Connect to a low-noise +3.3 ± 0.3 VDC power supply, and bypass to GND with a 0.1 µF ceramic capacitor in parallel with a 100 pF ceramic capacitor. A bulk capacitance of 10 µF needs to be in the vicinity of the LM63’s V DD pin. 2 D+ Analog Input Connect to the anode (positive side) of the remote diode. A 2.2 nF ceramic capacitor must be connected between pins 2 and 3. 3 D− Analog Input Connect to the cathode (negative side) of the remote diode. A 2.2 nF ceramic capacitor must be connected between pins 2 and 3. 4 PWM Open-Drain Digital Output Open-Drain Digital Output. Connect to fan drive circuitry. The power-on default for this pin is low (pin 4 pulled to ground). 5 GND Ground This is the analog and digital ground return. 6 ALERT/TACH Digital I/O Depending on how the LM63 is programmed, this pin is either an open-drain ALERT output or a tachometer input for measuring fan speed. The power-on default for this pin is the ALERT function. 7 SMBDAT Digital Input/ Open-Drain Output This is the bi-directional SMBus data line. 8 SMBCLK Digital Input Digital Input. This is the SMBus clock input. Simplified Block Diagram 20057002 www.national.com 2 |
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